高铬铸铁铸态奥氏体的亚临界热处理的研究

Investigation of Subcritical Heat Treatment of As-cast Austenite in High Chromium Cast Iron

研究了高铬铸铁铸态奥氏体在低于A_1亚临界温度范围内的热处理.结果表明,在450～600℃温度区间内进行热处理,奥氏体均能分解转变成马氏体+细颗粒状的二次合金碳化物.在530～600℃范围内热处理,能获得最佳综合力学性能.用此工艺可代替高铬铸铁的正火处理,具有节能、变形小及工艺简单等优点,便于中小厂矿应用和推广.

In this paper the heat treatment below A_1 point is investigated.It is shown that the as-cast austenite can transform into martensite matrix+fine spheroidized secondary alloy carbide when treated at the range of 450℃～600℃,while optimal comprehensive mechanical properties can be obtained by treating at 530℃～600℃.This new process can replace the normalization of high Cr cast iron.It possesses advantage that energy saving,distortion reducing,process simple and suitable for the middle and small factories.