Explanation

The alloy is heated to obtain the corresponding high temperature phase, and then rapidly cooled to obtain the heat treatment process of low temperature metastable structure. Most steel get martensite with high strength and hardness after quenching, so quenching is the most important heat treatment process to strengthen most steel materials. However, for steel with high alloy content whose room temperature stable structure is austenite, single-phase uniform austenite structure is obtained after quenching treatment, and its strength and hardness are relatively low, so it is a bating process instead. There are many kinds of quenching processes for steel, which can be divided into complete quenching, unfull quenching, subthermal quenching, low temperature quenching, etc. according to different heating temperatures; According to different heating medium and heating method, it can be divided into: air medium heating quenching, salt bath heating quenching, controlled atmosphere heating quenching, vacuum heating quenching, induction heating quenching, residual heat quenching, secondary heating quenching, etc; According to the different quenchant used, it can be divided into: single liquid quenching, two-liquid quenching quenching, hot bath quenching and air cooling quenching; according to the different cooling methods of quenching, it can be divided into: precooling quenching, continuous cooling quenching, local hardening, liquid injection quenching, isothermal quenching, marquwiching, etc.

Classification