Chemistry:Inconel

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Short description: Austenitic nickel-chromium superalloys
Inconel 718 round bar

Inconel is a nickel-chromium-based superalloy often utilized in extreme environments where components are subjected to high temperature, pressure or mechanical loads. Inconel alloys are oxidation- and corrosion-resistant. When heated, Inconel forms a thick, stable, passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, attractive for high-temperature applications where aluminium and steel would succumb to creep as a result of thermally-induced crystal vacancies. Inconel's high-temperature strength is developed by solid solution strengthening or precipitation hardening, depending on the alloy.[1][2]

Inconel alloys are typically used in high temperature applications. Common trade names for

  • Inconel Alloy 625 include: Inconel 625, Chronin 625, Altemp 625, Haynes 625, Nickelvac 625 Nicrofer 6020 and UNS designation N06625.[3]
  • Inconel Alloy 600 include: NA14, BS3076, 2.4816, NiCr15Fe (FR), NiCr15Fe (EU), NiCr15Fe8 (DE) and UNS designation N06600.
  • Inconel 718 include: Nicrofer 5219, Superimphy 718, Haynes 718, Pyromet 718, Supermet 718, Udimet 718 and UNS designation N07718.[4]

History

The Inconel family of alloys was first developed before December 1932, when its trademark was registered by the US company International Nickel Company of Delaware and New York.[5][6] A significant early use was found in support of the development of the Whittle jet engine,[7] during the 1940s by research teams at Henry Wiggin & Co of Hereford, England a subsidiary of the Mond Nickel Company,[8] which merged with Inco in 1928. The Hereford Works and its properties including the Inconel trademark were acquired in 1998 by Special Metals Corporation.[9]

Specific data

Alloy Solidus °C (°F) Liquidus °C (°F)
Inconel 600[10] 1354 (2,469) 1413 (2,575)
Inconel 617[11][12] 1332 (2,430) 1377 (2,511)
Inconel 625[13] 1290 (2,350) 1350 (2,460)
Inconel 690[14] 1343 (2,449) 1377 (2,511)
Inconel 718[15] 1260 (2,300) 1336 (2,437)
Inconel X-750[16] 1390 (2,530) 1430 (2,610)

Composition

Inconel alloys vary widely in their compositions, but all are predominantly nickel, with chromium as the second element.

Inconel Element, proportion by mass (%)
Ni Cr Fe Mo Nb & Ta Co Mn Cu Al Ti Si C S P B
600[17] ≥72.0[lower-alpha 1] 14.0–17.0 6.0–10.0 N/A ≤1.0 ≤0.5 ≤0.5 ≤0.15 ≤0.015
617[18] 44.2–61.0 20.0–24.0 ≤3.0 8.0–10.0 10.0–15.0 ≤0.5 ≤0.5 0.8–1.5 ≤0.6 ≤0.5 0.05–0.15 ≤0.015 ≤0.015 ≤0.006
625[19] ≥58.0 20.0–23.0 ≤5.0 8.0–10.0 3.15–4.15 ≤1.0 ≤0.5 ≤0.4 ≤0.4 ≤0.5 ≤0.1 ≤0.015 ≤0.015
690[20] ≥58 27–31 7–11 ≤0.50 ≤0.50 ≤0.50 ≤0.05 ≤0.015
Nuclear grade 690[20] ≥58 28–31 7–11 ≤0.10 ≤0.50 ≤0.50 ≤0.50 ≤0.04 ≤0.015
718[1] 50.0–55.0 17.0–21.0 Balance 2.8–3.3 4.75–5.5 ≤1.0 ≤0.35 ≤0.3 0.2–0.8 0.65–1.15 ≤0.35 ≤0.08 ≤0.015 ≤0.015 ≤0.006
X-750[21] ≥70.0 14.0–17.0 5.0–9.0 0.7–1.2 ≤1.0 ≤1.0 ≤0.5 0.4–1.0 2.25–2.75 ≤0.5 ≤0.08 ≤0.01
  1. ↑ Includes cobalt

Properties

When heated, Inconel forms a thick and stable passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, attractive for high-temperature applications where aluminium and steel would succumb to creep as a result of thermally induced crystal vacancies (see Arrhenius equation). Inconel's high temperature strength is developed by solid solution strengthening or precipitation strengthening, depending on the alloy. In age-hardening or precipitation-strengthening varieties, small amounts of niobium combine with nickel to form the intermetallic compound Ni3Nb or gamma double prime (γ″). Gamma prime forms small cubic crystals that inhibit slip and creep effectively at elevated temperatures. The formation of gamma-prime crystals increases over time, especially after three hours of a heat exposure of 850 °C (1,560 °F), and continues to grow after 72 hours of exposure.[22]

Strengthening mechanisms

The most prevalent hardening mechanisms for Inconel alloys are precipitate strengthening and solid solution strengthening. In Inconel alloys, one of the two often dominates. For alloys like Inconel 718, precipitate strengthening is the main strengthening mechanism. The majority of strengthening comes from the presence of gamma double prime (γ″) precipitates.[23][24][25][26] Inconel alloys have a γ matrix phase with an FCC structure.[25][27][28][29] γ″ precipitates are made of Ni and Nb, specifically with a Ni3Nb composition. These precipitates are fine, coherent, disk-shaped, intermetallic particles with a tetragonal structure.[24][25][26][27][30][31][32][33]

Secondary precipitate strengthening comes from gamma prime (γ') precipitates. The γ' phase can appear in multiple compositions such as Ni3(Al, Ti).[24][25][26] The precipitate phase is coherent and has an FCC structure, like the γ matrix;[33][27][30][31][32] The γ' phase is much less prevalent than γ″. The volume fraction of the γ″ and γ' phases are approximately 15% and 4% after precipitation, respectively.[24][25] Because of the coherency between the γ matrix and the γ' and γ″ precipitates, strain fields exist that obstruct the motion of dislocations. The prevalence of carbides with MX(Nb, Ti)(C, N) compositions also helps to strengthen the material.[25] For precipitate strengthening, elements like niobium, titanium, and tantalum play a crucial role.[34]

Because the γ″ phase is metastable, over-aging can result in the transformation of γ″ phase precipitates to delta (δ) phase precipitates, their stable counterparts.[25][27] The δ phase has an orthorhombic structure, a Ni3(Nb, Mo, Ti) composition, and is incoherent.[35][29] As a result, the transformation of γ″ to δ in Inconel alloys leads to the loss of coherency strengthening, making for a weaker material. That being said, in appropriate quantities, the δ phase is responsible for grain boundary pinning and strengthening.[33][32][29]

Another common phase in Inconel alloys is the Laves intermetallic phase. Its compositions are (Ni, Cr, Fe)x(Nb, Mo, Ti)y and NiyNb, it is brittle, and its presence can be detrimental to the mechanical behavior of Inconel alloys.[27][33][36] Sites with large amounts of Laves phase are prone to crack propagation because of their higher potential for stress concentration.[31] Additionally, due to its high Nb, Mo, and Ti content, the Laves phase can exhaust the matrix of these elements, ultimately making precipitate and solid-solution strengthening more difficult.[32][36][28]

For alloys like Inconel 625, solid-solution hardening is the main strengthening mechanism. Elements like Mo are important in this process. Nb and Ta can also contribute to solid solution strengthening to a lesser extent.[34] In solid solution strengthening, Mo atoms are substituted into the γ matrix of Inconel alloys. Because Mo atoms have a significantly larger radius than those of Ni (209 pm and 163 pm, respectively), the substitution creates strain fields in the crystal lattice, which hinder the motion of dislocations, ultimately strengthening the material.

The combination of elemental composition and strengthening mechanisms is why Inconel alloys can maintain their favorable mechanical and physical properties, such as high strength and fatigue resistance, at elevated temperatures, specifically those up to 650°C.[23]

Machining

Inconel is a difficult metal to shape and to machine using traditional cold forming techniques due to rapid work hardening. After the first machining pass, work hardening tends to plastically deform either the workpiece or the tool on subsequent passes. For this reason, age-hardened Inconels such as 718 are typically machined using an aggressive but slow cut with a hard tool, minimizing the number of passes required. Alternatively, the majority of the machining can be performed with the workpiece in a "solutionized" form,[clarification needed] with only the final steps being performed after age hardening. However some claim[by whom?] that Inconel can be machined extremely quickly with very fast spindle speeds using a multifluted ceramic tool with small depth of cut at high feed rates as this causes localised heating and softening in front of the flute.

External threads are machined using a lathe to "single-point" the threads or by rolling the threads in the solution treated condition (for hardenable alloys) using a screw machine. Inconel 718 can also be roll-threaded after full aging by using induction heat to 700 °C (1,290 °F) without increasing the grain size.[citation needed] Holes with internal threads are made by threadmilling. Internal threads can also be formed using a sinker electrical discharge machining (EDM).[citation needed]

Joining

Welding of some Inconel alloys (especially the gamma prime precipitation hardened family; e.g., Waspaloy and X-750) can be difficult due to cracking and microstructural segregation of alloying elements in the heat-affected zone. However, several alloys such as 625 and 718 have been designed to overcome these problems. The most common welding methods are gas tungsten arc welding and electron-beam welding.[37]

Uses

Astra rocket engine

Inconel is often encountered in extreme environments. It is common in gas turbine blades, seals, and combustors, as well as turbocharger rotors and seals, electric submersible well pump motor shafts, high temperature fasteners, chemical processing and pressure vessels, heat exchanger tubing, steam generators and core components in nuclear pressurized water reactors,[38] natural gas processing with contaminants such as H2S and CO2, firearm sound suppressor blast baffles, and Formula One, NASCAR, NHRA, and APR, LLC exhaust systems.[39][40] It is also used in the turbo system of the 3rd generation Mazda RX7, and the exhaust systems of high powered Wankel engined Norton motorcycles where exhaust temperatures reach more than 1,000 °C (1,830 °F).[41] Inconel is increasingly used in the boilers of waste incinerators.[42] The Joint European Torus and DIII-D tokamaks' vacuum vessels are made of Inconel.[43] Inconel 718 is commonly used for cryogenic storage tanks, downhole shafts, wellhead parts,[44] and in the aerospace industry -- where it has become a prime candidate material for constructing heat resistant turbines.[45]

Aerospace

  • The Space Shuttle used four Inconel studs to secure the solid rocket boosters to the launch platform, eight total studs supported the entire weight of the ready to fly Shuttle system. Eight frangible nuts are encased on the outside of the solid rocket boosters, at launch explosives separated the nuts releasing the Shuttle from its launch platform.[citation needed]
  • North American Aviation constructed the skin of the North American X-15 Rocket-powered aircraft out of Inconel X/750 alloy.[46]
  • Rocketdyne used Inconel X-750 for the thrust chamber of the F-1 rocket engine used in the first stage of the Saturn V booster.[47]
  • SpaceX uses inconel (Inconel 718[48]) in the engine manifold of their Merlin engine which powers the Falcon 9 launch vehicle.[49]
  • In a first for 3D printing, the SpaceX SuperDraco rocket engine that provides launch escape system for the Dragon V2 crew-carrying space capsule is fully printed. In particular, the engine combustion chamber is printed of Inconel using a process of direct metal laser sintering, and operates at very high temperature and a chamber pressure of 6.9 megapascals (1,000 psi).[50][51][52][53][54][55]
  • SpaceX cast the Raptor rocket engine manifolds from SX300, later SX500, which are monocrystal nickel alloy (improvement over older Inconel alloys).[56]

Automotive

  • Tesla claims to use Inconel in place of steel in the main battery pack contactor of its Model S so that it remains springy under the heat of heavy current. Tesla claims that this allows these upgraded vehicles to safely increase the maximum pack output from 1300 to 1500 amperes, allowing for an increase in power output (acceleration) Tesla refers to as "Ludicrous Mode".[50][57]
  • Ford Motor Company is using Inconel to make the turbine wheel in the turbocharger of its EcoBlue diesel engines introduced in 2016.[58]
  • The exhaust valves on NHRA Top Fuel and Funny Car drag racing engines are often made of Inconel.[59]
  • Ford Australia used Inconel valves in their turbocharged Barra engines. These valves have been proven very reliable, holding in excess of 1900 horsepower.[60]
  • BMW has since used Inconel in the exhaust manifold of its high performance luxury car, the BMW M5 E34 with the S38 engine, withstanding higher temperatures and reducing backpressure.[61]
  • Jaguar Cars has fit, in their Jaguar F-Type SVR high performance sports car, a new lightweight Inconel titanium exhaust system as standard which withstands higher peak temperatures, reduces backpressure and eliminates 16 kg (35 lb) of mass from the vehicle.[62]
  • DeLorean Motor Company offers Inconel replacements for failure prone OE trailing arm bolts on the DMC-12. Failure of these bolts can result in loss of the vehicle.[63]

Rolled Inconel was frequently used as the recording medium by engraving in black box recorders on aircraft.[64]

Alternatives to the use of Inconel in chemical applications such as scrubbers, columns, reactors, and pipes are Hastelloy, perfluoroalkoxy (PFA) lined carbon steel or fiber reinforced plastic.

Inconel alloys

Alloys of inconel include:

  • Inconel 188: Readily fabricated for commercial gas turbine and aerospace applications.
  • Inconel 230: Alloy 230 Plate & Sheet mainly used by the power, aerospace, chemical processing and industrial heating industries.
  • Inconel 600: In terms of high-temperature and corrosion resistance, Inconel 600 excels.[65]
  • Inconel 601
  • Inconel 617: Solid solution strengthened (nickel-chromium-cobalt-molybdenum), high-temperature strength, corrosion and oxidation resistant, high workability and weldability.[66] Incorporated in ASME Boiler and Pressure Vessel Code for high temperature nuclear applications such as molten salt reactors c. April, 2020.[67]
  • Inconel 625: Acid resistant, good weldability. The LCF version is typically used in bellows.
  • Inconel 690: Low cobalt content for nuclear applications, and low resistivity[68]
  • Inconel 706
  • Inconel 713C: Precipitation hardenable nickel-chromium base cast alloy[2]
  • Inconel 718: Gamma double prime strengthened with good weldability[69]
  • Inconel 738
  • Inconel X-750: Commonly used for gas turbine components, including blades, seals and rotors.
  • Inconel 751: Increased aluminium content for improved rupture strength in the 1600 °F range[70]
  • Inconel 792: Increased aluminium content for improved high temperature corrosion resistant properties, used especially in gas turbines
  • Inconel 907
  • Inconel 909
  • Inconel 925: Inconel 925 is a nonstabilized austenitic stainless steel with low carbon content.[71]
  • Inconel 939: Gamma prime strengthened to increase weldability

In age hardening or precipitation strengthening varieties, alloying additions of aluminum and titanium combine with nickel to form the intermetallic compound Ni
3(Ti,Al) or gamma prime (γ′). Gamma prime forms small cubic crystals that inhibit slip and creep effectively at elevated temperatures.

See also

References

  1. ↑ 1.0 1.1 Inconel alloy 718 , Special Metals Corporation
  2. ↑ 2.0 2.1 "Archived copy". http://www.nickelinstitute.org/~/media/Files/TechnicalLiterature/Alloy713C_337_.ashx. 
  3. ↑ "Special Alloys: Inconel 625". http://www.source1alloys.com/alloys/Inconel_625.html. 
  4. ↑ "Inconel Alloy 718". https://www.americanspecialmetals.com/InconelAlloy718.html. 
  5. ↑ "Word Mark : Inconel". Trademark Electronic Search System (TESS). United States Patent and Trademark Office. https://tmsearch.uspto.gov/bin/showfield?f=doc&state=4810:9v10p.5.3. 
  6. ↑ Monel, Inconel, Nickel, and Nickel Alloys. Development and Research Division: International Nickel Company. 1947. 
  7. ↑ Jones, T.L.. "Frank Whittle's W2B Turbojet: United Kingdom versus United States Development". Aircraft Engine Historical Society, Inc. http://www.enginehistory.org/GasTurbines/W2B.shtml. 
  8. ↑ Annual Report on the Mineral Production of Canada. Canada. Dominion Bureau of Statistics. 1932. p. 88. 
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  11. ↑ "Inconel 617 Alloy | American Elements". https://www.americanelements.com/inconel-617-alloy. 
  12. ↑ "ASM Material Data Sheet". http://asm.matweb.com/search/SpecificMaterial.asp?bassnum=NINC32. 
  13. ↑ "Inconel 625 Alloy | American Elements". https://www.americanelements.com/inconel-625-alloy. 
  14. ↑ "Inconel 690 Alloy | American Elements". https://www.americanelements.com/inconel-690-alloy. 
  15. ↑ "Inconel 718 Alloy | American Elements". https://www.americanelements.com/inconel-718-alloy. 
  16. ↑ "ASM Material Data Sheet". http://asm.matweb.com/search/SpecificMaterial.asp?bassnum=NINC35. 
  17. ↑ Inconel alloy 600 , Special Metals Corporation
  18. ↑ hightempmetals.com, High Temp Metals
  19. ↑ Inconel alloy 625, Special Metals Corporation
  20. ↑ 20.0 20.1 Inconel alloy 690 , Special Metals Corporation
  21. ↑ Inconel alloy X-750 , Special Metals Corporation
  22. ↑ "DoITPoMS - Full Record". http://www.doitpoms.ac.uk/miclib/full_record.php?id=716. 
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  25. ↑ 25.0 25.1 25.2 25.3 25.4 25.5 25.6 Hosseini, E.; Popovich, V. A. (2019-12-01). "A review of mechanical properties of additively manufactured Inconel 718" (in en). Additive Manufacturing 30: 100877. doi:10.1016/j.addma.2019.100877. ISSN 2214-8604. https://www.sciencedirect.com/science/article/pii/S221486041930226X. 
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  27. ↑ 27.0 27.1 27.2 27.3 27.4 Tucho, Wakshum M.; Cuvillier, Priscille; Sjolyst-Kverneland, Atle; Hansen, Vidar (2017-03-24). "Microstructure and hardness studies of Inconel 718 manufactured by selective laser melting before and after solution heat treatment" (in en). Materials Science and Engineering: A 689: 220–232. doi:10.1016/j.msea.2017.02.062. ISSN 0921-5093. https://www.sciencedirect.com/science/article/pii/S092150931730223X. 
  28. ↑ 28.0 28.1 Yu, Xiaobin; Lin, Xin; Tan, Hua; Hu, Yunlong; Zhang, Shuya; Liu, Fencheng; Yang, Haiou; Huang, Weidong (2021-02-01). "Microstructure and fatigue crack growth behavior of Inconel 718 superalloy manufactured by laser directed energy deposition" (in en). International Journal of Fatigue 143: 106005. doi:10.1016/j.ijfatigue.2020.106005. ISSN 0142-1123. https://www.sciencedirect.com/science/article/pii/S0142112320305375. 
  29. ↑ 29.0 29.1 29.2 Jambor, Michal; Bokůvka, Otakar; Nový, František; Trško, Libor; Belan, Juraj (2017-06-01). "Phase Transformations in Nickel base Superalloy Inconel 718 during Cyclic Loading at High Temperature" (in en). Production Engineering Archives 15 (15): 15–18. doi:10.30657/pea.2017.15.04. 
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  36. ↑ 36.0 36.1 Sohrabi, Mohammad Javad; Mirzadeh, Hamed; Rafiei, Mohsen (2018-08-01). "Solidification behavior and Laves phase dissolution during homogenization heat treatment of Inconel 718 superalloy" (in en). Vacuum 154: 235–243. doi:10.1016/j.vacuum.2018.05.019. ISSN 0042-207X. https://www.sciencedirect.com/science/article/pii/S0042207X18305700. 
  37. ↑ Joining, http://www.specialmetalswelding.com/publica/joining.pdf, retrieved 2009-10-09 .
  38. ↑ "Inconel alloy 625, Specials Metals, 2015". http://www.specialmetals.com/documents/Inconel%20alloy%20625.pdf. 
  39. ↑ Power Generation , Special Metals Corporation.
  40. ↑ Chemical Processing , Special Metals Corporation.
  41. ↑ Motorcycle Trader.Norton Rotary Revival.Cathcart.Dec 2007.
  42. ↑ Inconell – state-of-the-art corrosion protection by Babcock & Wilcox Vølund, 2003
  43. ↑ The Inconel JET vessel in use since 1983 . A simple, sturdy structure.
  44. ↑ Inconel Alloy, Inconel 718.
  45. ↑ "What are the applications for Inconel 718?" (in en-US). https://www.langleyalloys.com/knowledge-advice/what-are-the-applications-for-inconel-718/. 
  46. ↑ Robert S. Houston, Richard P. Hallion, and Ronald G. Boston, Editor's introduction, "Transiting from Air to Space: The North American X-15", The Hypersonic Revolution: Case Studies in the History of Hypersonic Technology, Air Force History and Museums Program, 1998. NASA.gov.
  47. ↑ Anthony Young, "The Saturn V Booster: Powering Apollo into History", Springer-Verlag, 2009.
  48. ↑ History of inconel and superalloys
  49. ↑ "Space Launch Report: SpaceX Falcon 9 Data Sheet". 1 May 2017. http://www.spacelaunchreport.com/falcon9.html. 
  50. ↑ 50.0 50.1 "Elon Musk's recent "Ludicrous" announcement hints at more synergy between Tesla and SpaceX - Electrek". Electrek. http://electrek.co/2015/07/22/elon-musks-recent-ludicrous-announcement-hints-at-more-synergy-between-tesla-and-spacex/. 
  51. ↑ Norris, Guy (2014-05-30). "SpaceX Unveils 'Step Change' Dragon 'V2'". Aviation Week. http://aviationweek.com/space/spacex-unveils-step-change-dragon-v2. 
  52. ↑ Kramer, Miriam (2014-05-30). "SpaceX Unveils Dragon V2 Spaceship, a Manned Space Taxi for Astronauts — Meet Dragon V2: SpaceX's Manned Space Taxi for Astronaut Trips". space.com. http://www.space.com/26063-spacex-unveils-dragon-v2-manned-spaceship.html. 
  53. ↑ Bergin, Chris (2014-05-30). "SpaceX lifts the lid on the Dragon V2 crew spacecraft". NASAspaceflight.com. http://www.nasaspaceflight.com/2014/05/spacex-lifts-the-lid-dragon-v2-crew-spacecraft/. 
  54. ↑ Foust, Jeff (2014-05-30). "SpaceX unveils its "21st century spaceship"". NewSpace Journal. http://www.newspacejournal.com/2014/05/30/spacex-unveils-its-21st-century-spaceship/. 
  55. ↑ "SpaceX Launches 3D-Printed Part to Space, Creates Printed Engine Chamber for Crewed Spaceflight". SpaceX. http://www.spacex.com/news/2014/07/31/spacex-launches-3d-printed-part-space-creates-printed-engine-chamber-crewed. "Compared with a traditionally cast part, a printed [part] has superior strength, ductility, and fracture resistance, with a lower variability in materials properties. ... The chamber is regeneratively cooled and printed in Inconel, a high performance superalloy. Printing the chamber resulted in an order of magnitude reduction in lead-time compared with traditional machining – the path from the initial concept to the first hotfire was just over three months. During the hotfire test, ... the SuperDraco engine was fired in both a launch escape profile and a landing burn profile, successfully throttling between 20% and 100% thrust levels. To date the chamber has been fired more than 80 times, with more than 300 seconds of hot fire." 
  56. ↑ SpaceX Casting Raptor Engine Parts from Supersteel Alloys Feb 2019
  57. ↑ "Three Dog Day". http://www.teslamotors.com/blog/three-dog-day. 
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  60. ↑ "Inside a 7-second Ford Barra street car | fullBOOST". 2021-05-09. https://www.youtube.com/watch?v=2hKpRTrGT54. 
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  62. ↑ "Jaguar Introduces Ultra-High Performance F-Type SVR ahead of Geneva Debut". http://www.jaguarusa.com/about-jaguar/news/jaguar-introduces-f-type-svr-ahead-of-geneva-debut.html. 
  63. ↑ "Trailing Arm Bolts". http://support.delorean.com/kb/a72/trailing-arm-bolts.aspx. 
  64. ↑ Barrett, Brian (10 January 2011). "The Secret Sauce of an Airplane's Black Box". https://gizmodo.com/5729507/the-secret-sauce-of-airplanes-black-box. 
  65. ↑ thepipingmart (2023-06-28). "Inconel 600 Plates vs Inconel 625 Plates: Which One Should You Choose?" (in en). https://steemit.com/inconel/@thepipingmart/inconel-600-plates-vs-inconel-625-plates-which-one-should-you-choose. 
  66. ↑ "Inconel alloy 617". March 2005. https://www.specialmetals.com/documents/technical-bulletins/inconel/inconel-alloy-617.pdf. 
  67. ↑ "Commercial alloy qualified for new use, expanding nuclear operating temperature". U.S. Department of Energy Idaho National Laboratory. April 28, 2020. https://inl.gov/article/a-new-material-expands-nuclear-operating-temperature/. 
  68. ↑ Inconel alloy 690 , NDT Resource Center
  69. ↑ "DMLS in Aluminum, Inconel or Titanium - Is it worth it? - Blog". http://gpiprototype.com/blog/dmls-in-aluminum-inconel-or-titanium-is-it-worth-it.html. 
  70. ↑ Inconel alloy 751, Special Metals Corporation
  71. ↑ Vishal Kumar Jaiswal "Experimental Investigation of Process Parameters on Inconel 925 for EDM Process by using Taguchi Method." International Journal for Scientific Research and Development 6.5 (2018): 277-282. , IJSRD



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