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2. Hardening (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Hardening_(metallurgy)

   Hardening is a metallurgical metalworking process used to increase the hardness of a metal. The hardness of a metal is directly proportional to the uniaxial yield stress at the location of the imposed strain. A harder metal will have a higher resistance to plastic deformation than a less hard metal.

3. Hardened steel - Wikipedia

   en.wikipedia.org/wiki/Hardened_steel

   To examine a piece of steel, obtain a hand file and file an edge of the selected metal. If the piece of steel has not undergone the hardening process, the metal file should easily 'bite' into the sample. If the metal has been hardened, the file fails to cut into the sample and glances off with little visible effect.

4. Ferritic nitrocarburizing - Wikipedia

   en.wikipedia.org/wiki/Ferritic_nitrocarburizing

   The finish on a Glock pistol is the third and final hardening process. It is 0.05 mm (0.0020 in) thick and produces a 64 Rockwell C hardness rating via a 500 °C (932 °F) nitride bath. [ 33 ] The final matte, non-glare finish meets or exceeds stainless steel specifications, is 85% more corrosion resistant than a hard chrome finish, and is 99.9 ...

5. Precipitation hardening - Wikipedia

   en.wikipedia.org/wiki/Precipitation_hardening

   Precipitation hardening, also called age hardening or particle hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels, stainless steels, and duplex stainless steel.

6. Heat treating - Wikipedia

   en.wikipedia.org/wiki/Heat_treating

   Case hardening is a thermochemical diffusion process in which an alloying element, most commonly carbon or nitrogen, diffuses into the surface of a monolithic metal. The resulting interstitial solid solution is harder than the base material, which improves wear resistance without sacrificing toughness.

7. Case-hardening - Wikipedia

   en.wikipedia.org/wiki/Case-hardening

   Case-hardening or carburization is the process of introducing carbon to the surface of a low-carbon iron, or more commonly a low-carbon steel object, in order to harden the surface. Iron which has a carbon content greater than ~0.02% is known as steel .