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Inconel

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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 aluminum 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 various Inconel alloys include:

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

History

[edit]

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

[edit]
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

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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[a] 14.0–17.0 6.0–10.0 — ≤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

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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

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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 [clarification needed] 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

[edit]

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[who?] that Inconel can be machined extremely quickly with very fast spindle speeds using a multifluted ceramic tool with small width of cut at high feed rates as this causes localized 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

[edit]

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

[edit]
Delphin 3.0 rocket engine, used on Astra Rocket. 3D-printed in Inconel

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 engine and 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

[edit]

Automotive

[edit]
  • 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

[edit]

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.[68] The LCF version is typically used in bellows. It is commonly used for applications in aeronautic, aerospace, marine, chemical and petrochemical industries.[69] It is also used for reactor-core and control-rod components in pressurized water reactors and as heat exchanger tubes in ammonia cracker plants for heavy water production.[70]
  • Inconel 690: Low cobalt content for nuclear applications, and low resistivity[71]
  • Inconel 706
  • Inconel 713C: Precipitation hardenable nickel-chromium base cast alloy[2]
  • Inconel 718: Gamma double prime strengthened with good weldability[72]
  • Inconel 738
  • Inconel X-750: Commonly used for gas turbine components, including blades, seals and rotors.
  • Inconel 751: Increased aluminum content for improved rupture strength in the 1600 °F range[73]
  • Inconel 792: Increased aluminum 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.[74]
  • 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 Ni3(Ti,Al) or gamma prime (γ′). Gamma prime forms small cubic crystals that inhibit slip and creep effectively at elevated temperatures.

See also

[edit]
Wikimedia Commons has media related to Inconel.
Look up inconel in Wiktionary, the free dictionary.

References

[edit]
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