Inconel

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Inconel

Inconel is a registered trademark

TradeMark

TradeMark is a tall, primarily residential, skyscraper in Charlotte, North Carolina. It was completed in 2007 and has 28 floors. There are 200 hundred residential units....
of Special Metals Corporation

Special Metals Corporation

Special Metals Corporation, headquartered in New Hartford , New York, New York, U.S.A., with operations in Huntington, West Virginia, West Virginia, and Hereford, England, is a supplier of refractory alloys....
that refers to a family of austenitic nickel

Nickel

Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge....
-chromium

Chromium

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....
-based superalloy

Superalloy

A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength and Creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance....
s . Inconel alloys are typically used in high temperature applications. It is often referred to in English as "Inco" (or occasionally "Iconel"). Common trade names for Inconel include: Inconel 625, Chronin 625, Altemp 625, Haynes 625, Nickelvac 625 and Nicrofer 6020.

erent Inconels have widely varying compositions, but all are predominantly nickel, with chromium as the second element.

nel alloys are oxidation and corrosion

Corrosion

Corrosion means the breaking down of essential properties in a material due to chemical reactions with its surroundings. In the most common use of the word, this means a loss of electrons of metals reacting with water and oxygen....
resistant materials well suited for service in extreme environments.

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Encyclopedia

Inconel is a registered trademark

TradeMark

Special Metals Corporation

Nickel

Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge....
-chromium

Chromium

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....
-based superalloy

Superalloy

Composition

Different Inconels have widely varying compositions, but all are predominantly nickel, with chromium as the second element.

Inconel	Element (% by mass)
Inconel	Nickel Nickel Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge....	Chromium Chromium Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....	Iron Iron Iron is a chemical element with the symbol Fe and atomic number 26. Iron is a Group 8 element and period 4 element. Iron is lustrous and silvery in color....	Molybdenum Molybdenum Molybdenum , is a Group 6 element chemical element with the symbol Mo and atomic number 42. It has the List of elements by melting point melting point of any element....	Niobium Niobium Niobium , or columbium , is a chemical element with symbol Nb and atomic number 41. A rare, soft, grey, ductile transition metal, niobium is found in the minerals pyrochlore and columbite....	Cobalt Cobalt Cobalt is a hard, lustrous, grey metal, a chemical element with symbol Co and atomic number 27. Although cobalt-based colors and pigments have been used since ancient times, and miners have long used the name kobold ore for some minerals, cobalt was only discovered in 1735 by Georg Brandt....	Manganese Manganese Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a Oxidation state in nature , and in many minerals....	Copper Copper Copper is a chemical element with the symbol Cu and atomic number 29.It is a ductile metal with very high thermal and electrical conductivity....	Aluminium Aluminium Aluminium or aluminum is a silvery white and ductile member of the boron group of chemical elements. It has the symbol Al; its atomic number is 13....	Titanium Titanium Titanium is a chemical element with the symbol Ti and atomic number 22. Sometimes called the ?space age metal?, it has a low density and is a strong, lustrous, corrosion-resistant transition metal with a silver colour....	Silicon Silicon Silicon is the most common metalloid. It is a chemical element, which has the symbol Si and atomic number 14. The atomic mass is 28.0855....	Carbon Carbon Carbon is a chemical element with chemical symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalence?making four electrons available to form covalent bond chemical bonds....	Sulfur Sulfur Sulfur or sulphur is the chemical element that has the atomic number 16. It is denoted with the symbol S. It is an abundant Valence non-metal....	Phosphorus Phosphorus Phosphorus is the chemical element that has the symbol P and atomic number 15. The name comes from the and . A Valency nonmetal of the nitrogen group, phosphorus is commonly found in inorganic phosphate minerals....	Boron Boron Boron is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent metalloid element which occurs abundantly in the evaporite ores borax and ulexite....
600	72.0	14.0-17.0	6.0-10.0				1.0	0.5			0.5	0.15	0.015
625	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
718	50.0-55.0	17.0-21.0	balance	2.8-3.3	4.75-5.5	1.0	0.35	0.2-0.8	0.65-1.15	0.3	0.35	0.08	0.015	0.015	0.006

Properties

Inconel alloys are oxidation and corrosion

Corrosion

Passivation

Passivation is the process of making a material "passive" in relation to another material prior to using the materials together. For example, prior to storing hydrogen peroxide in an aluminium container, the container can be passivated by rinsing it with a dilute solution of nitric acid and peroxide alternating with deionized water....
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

Steel

Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.14% by weight , depending on grade. Carbon is the most cost-effective alloying material for iron, but various other alloying elements are used such as manganese, chromium, vanadium, and tungsten....
would succumb to creep as a result of thermally-induced crystal vacancies (see Arrhenius equation

Arrhenius equation

The Arrhenius equation is a simple, but remarkably accurate, formula for the temperature dependence of the rate constant, and therefore, rate of a chemical reaction....
). Inconel's high temperature strength is developed by solid solution

Solid solution

A solid solution is a solid-phase solution of one or more soluble in a solvent. Such a mixture is considered a solution rather than a Chemical compound when the crystal structure of the solvent remains unchanged by addition of the solutes, and when the mixture remains in a single wiktionary:Homogeneous phase ....
strengthening or precipitation strengthening

Precipitation strengthening

Precipitation hardening, also called age hardening or dispersion hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel and titanium, and some stainless steels....
, depending on the alloy. In age hardening or precipitation strengthening varieties, small amounts of niobium

Niobium

Niobium , or columbium , is a chemical element with symbol Nb and atomic number 41. A rare, soft, grey, ductile transition metal, niobium is found in the minerals pyrochlore and columbite....
combine with nickel to form the intermetallic compound Ni₃Nb or gamma prime (?'). Gamma prime forms small cubic crystals that inhibit slip and creep

Creep (deformation)

Creep is the tendency of a solid material to slowly move or deform permanently under the influence of stress es. It occurs as a result of long term exposure to levels of stress that are below the yield strength of the material....
effectively at elevated temperatures.

Machining

Inconel is a difficult metal to shape and machine using traditional techniques due to rapid work hardening

Work hardening

Work hardening, strain hardening, or cold work is the strength of materials by, macroscopically speaking, plastic deformation . As the material becomes increasingly saturated with new dislocations, more dislocations are prevented from nucleating ....
. After the first machining pass, work hardening tends to elastically deform either the workpiece or the tool on subsequent passes. For this reason, age-hardened Inconels such as 718 are 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 solutionised form, with only the final steps being performed after age-hardening. External threads

Screw thread

A screw thread is a helix structure used to convert between rotational and linear movement or force.A screw thread may be thought of as an inclined plane wrapped around a cylinder or cone ....
are machined using a lathe

Lathe

A lathe is a machine tool which spins a block of material to perform various operations such as cutting, sanding, knurling, drilling, or Deformation_ with tools that are applied to the workpiece to create an object which has rotational symmetry about an axis of rotation....
to "single point" the threads, or by rolling the threads using a screw machine

Screw machine

A screw machine is a metalworking machine tool used in the high-volume manufacture of turned components. Screw machines are fundamentally a type of Lathe that is specialized for the Automation production of small parts....
. Holes with internal threads are made by welding

Welding

Welding is a fabrication or sculpture process that joins materials, usually metals or thermoplastics, by causing coalescence . This is often done by melting the workpieces and adding a filler material to form a pool of molten material that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself,...
or brazing

Brazing

Brazing is a joining process whereby a filler metal or alloy is heated to melting temperature above ?or, by the traditional definition in the United States, above ?and distributed between two or more close-fitting parts by capillary action....
threaded inserts made of stainless steel

Stainless steel

In metallurgy, stainless steel is defined as a steel alloy with a minimum of 10% chromium content by mass. Stainless steel does not stain, corrode, or rust as easily as ordinary steel , but it is not stain-proof....
. Cutting of plate is often done with a waterjet cutter. Internal threads can also be cut by single point method on lathe, or by threadmilling on machining center. New whisker reinforced ceramic cutters are also used to machine nickel alloys. They remove material at a rate typically 8X faster than carbide cutters.

Joining

Welding inconel alloys is difficult due to cracking and microstructural segregation of alloying elements in the heat affected zone. However, several alloys have been designed to overcome these problems. The most common way to weld inconel is by using a TIG

Tig

Tig may refer to:*Gas_tungsten_arc_welding, a metal welding process.*Tig Notaro, an United States of America Stand-up comedy* TIG, abbreviation of Triennial Inter-varsity Games, held by the University of Hong Kong, the National University of Singapore, the University of Malaya and the University of Indonesia every three years since 1949...
welder with the appropriate filler metal.

New innovations in pulsed micro laser welding have also become more popular in recent years.

Uses

Inconel is often encountered in extreme environments. It is common in gas turbine

Gas turbine

A gas turbine, also called a combustion turbine, is a rotary engine that extracts energy from a flow of combustion gas. It has an upstream compressor coupled to a downstream turbine, and a combustion chamber in-between....
blades, seals, and combustors, as well as turbocharger

Turbocharger

A turbocharger, or turbo, is a gas compressor used for forced induction of an internal combustion engine. Like a supercharger, the purpose of a turbocharger is to increase the mass of air entering the engine to create more power....
rotors and seals, high temperature fasteners, chemical processing and pressure vessels, heat exchanger

Heat exchanger

A heat exchanger is a device built for efficient heat transfer from one medium to another, whether the media are separated by a solid wall so that they never mix, or the media are in direct contact....
tubing, steam generators in nuclear pressurized water reactors, natural gas progressing with contaminants such as H₂S and CO₂, firearm

Firearm

A firearm is a tool that projects either single or multiple projectiles at high velocity through a controlled explosion. The firing is achieved by the gases produced through rapid, confined combustion of a propellant....
sound suppressor

Suppressor

A suppressor, sound suppressor, sound moderator, or silencer is a device either attached to or part of the Gun barrel of a firearm to reduce the amount of noise and muzzle flash generated by firing the weapon....
blast baffles, and Formula One

Formula One racing

A Formula One race takes place over an entire weekend, with two free practice sessions on Friday, a practice session and a qualifying session on Saturday, and the race on Sunday....
exhaust systems.

North American Aviation

North American Aviation

North American Aviation was a major United States aircraft manufacturer, responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustang fighter aircraft, the B-25 Mitchell bomber, the F-86 Sabre jet aircraft fighter, and the X-15 rocket plane, as well as Apollo Apollo spacecraft, the second stage of the Satu...
constructed the skin of the X-15 rocket plane out of an Inconel alloy known as "Inconel X".

Inconel alloys

Inconel 600: Solid solution strengthened
Inconel 625: Acid resistant, good weldability
Inconel 690: Low cobalt content for nuclear applications
Inconel 718: Gamma double prime strengthened with good weldability
Inconel 751: Increased aluminum content for improved rupture strength in the 1600 F range
Inconel 939: Gamma prime strengthened with good weldability