请问高鉻铸铁的脱稳处理是怎么回事？

zjy95381

怎么个处理法？是不是脱稳处理完了后，再将铸件重新加热到淬火温度再淬火啊？还是淬火之前的保温就叫脱稳处理啊？请教，谢谢

qjohn

查了一下文献，大概是这样说的。希望对你有帮助。

Destabilisation heat treatment

1.The destabilisation (or conditioning) heat treatment involves holding at a temperature between 920 and 1060 for 1-6 h. At this temperature, secondary carbides precipitate in the matrix, reducing the matrix alloy content, and in particular, the carbon content. The reduced alloy content of the austenitic matrix increases the M; temperature, so that on cooling to room temperature, the matrix may transform to martensite. Air cooling from the destabilisation temperature is usually sufficient to produce a predominantly martensitic structure while avoiding quench cracking, though lower chromium alloys may be oil quenched.

2.The destabilization heat treatmen: involves holding at temperatures of around I000°C to precipitate secondary carbides in the austenite, thereby reducing the alloy content of the matrix. This destabilized austenite more readily transforms to martensite upon cooling to room temperature.