热处理对熔模铸造贝氏体钢组织和性能的影响

Influence of Heat Treatment Process on Mechanical and Microstucture of Investment Casting Bainitc Cast Steel

研究了不同的热处理工艺对熔模铸造 RZG20Si2Mn2Mo 贝氏体钢组织和性能的影响。试验结果表明,RZG20Si2Mn2Mo贝氏体铸钢熔模铸造晶粒粗大,常规的正火处理不能细化组织和提高韧性,提出了通过常规正火热处理前的淬火和高温回火或直接加热至1 000 ℃超高温正火可以有效的改善铸造贝氏体钢的晶粒粗大现象,并阐述了改善组织提高韧性的原因。

In this paper, the influence of different heat treatment process on mechanical properties and microstructure of RZG20Si2Mn2Mo bainitc investment casting steel were studied. The experiment results show that crystalline grain of investment moulding bainite casting steel is coarse, the norlmalizing heat treatment can not refine coarse the microstructure and improve toughness of bainitc cast steel. Quenching and high temperature before normalizing or austenitizing temperature at 1 000 ℃and norlmalizing can refine coarse austenitic grains of bainitc cast steel. The reason of coarse austenitic grain and toughness refinement were introduced.