Quenching - heat treatment is the process of rapidly cooling metal parts at a solution or austenitizing temperature, usually in the range of 815 to 870 ° c (1500 to 1600°F) for steel. High alloy steels and stainless steels can be hardened to reduce grain boundary carbides or improve ferrite distribution, but most steels (including carbon, low alloy, and tool steels) are hardened to produce controlled amounts of martensite in the microstructure. Successful hardening usually means achieving the desired microstructure, hardness, strength, or toughness, while minimizing the possibility of residual stress, deformation, and cracking.
The commonly used quenching medium in changzhou thermal treatment plant is liquid and depends on the hardening capacity of a particular alloy, the thickness and shape of the section involved, and the cooling rate required to achieve the desired microstructure.
Common liquid quenches include: oil may contain various additives, liquid polymers, water may contain salt or corrosive additives, and can also be quenched with a gas median, such as inert gases including helium, argon, and nitrogen. These quenched gases are sometimes used after austenitizing in vacuum.
The ability to harden steel depends on the cooling characteristics of the quenching medium, the quenching effect depends on the composition of the steel, the quenching type or the quenching condition, the design of the quenching system and the thoroughness of the system maintenance also contribute to the success of the process.
On 2018-08-08 11:45:46
