This surface treatment may be accomplishes in many ways, most likely by exposing the material to a carbonaceous or nitrogen rich environment at elevated temperatures. The carbon or nitrogen then diffuses into the surface of the material, increasing surface strength, thus increasing resistance to scratches and other surface flaws.
A process of hardening a ferrous alloy so that the surface layer or case is made substantially harder than the interior or core. Typically case hardening process are carburizing, carbonitriding, and nitriding.
A method of strengthening the surface of metals or optical materials involving heating the surface and quenching rapidly with air or water; leaving an amorphous layer of material on and just below the surface.
A generic term covering several processes applicable to steel that change the chemical composition of the surface layer by absorption of carbon, nitrogen, or a mixture of the two and, by diffusion, create a concentration gradient. The outer portion, or case, is made substantially harder than the inner portion, or core. The processes commonly used are carburizing and quench hardening; cyaniding: nitrifying; and carbonitriding. The use of the applicable specific process name is preferred.
Hardening a ferrous alloy to make the outside (case) much harder than the inside (core). This can be done carburizing, cyaniding, nitriding, carbonitriding, induction hardening, and flame hardening. Their application to stainless steel is limited wherever they decrease corrosion resistance.
A defect in the lumber caused by improper drying. Case Hardening is caused when a board is dried too fast. The outer layers in a case hardened board are compressed while the inner layers are in tension.
a process of surface hardening involving a change in the composition of the outer layer of an iron-base alloy by inward diffusion from a gas or liquid followed by appropriate thermal treatment. Typical hardening processes are carburizing, cyaniding, carbo-nitriding, and nitriding. Both carbon and alloy steels are suitable for case-hardening providing their carbon content is low, usually up to a maximum of 0.2%.
Also called carburizing. Case hardening is the addition of hardness, to the surface of steel by heating the steel in contact with carbon. Heated material is exposed to carbon then hardened by quenching or cooling slowly, reheating and quenching again. Used on tolls which need to retain the resilience of a soft metal to avoid cracking but need a hard surface or when it is simpler or cheaper to shape and carburize a softer material rather than using a harder metal. Cutting tools used for metal lathes or milling machines or the center of a lathe tailstock are usually carburized for wear resistance. Tools that must remain sharp while being resistant to impact are often carburized.
Case hardening or surface hardening is the process of hardening the surface of a metal, often a low carbon steel, by infusing elements into the material's surface, forming a thin layer of a harder alloy. Case hardening is usually done after the part in question has been formed into its final shape, but can also be done to increase the hardening element content of bars to be used in a pattern welding or similar process.
A drying defect characterised by the presence of compression stresses in the outer zone and tensile stresses in the core. It occurs when rapid drying has caused permanent set of the outer zones of a piece of wood.