新型奥氏体热作模具钢的显微组织及性能  

Microstructure and Properties of a New Austenitic Hot Die Steel

作　　者：王良平[1] 吴晓春[1] 闵娜[1] 江浩[1] 佟倩[1] 王庆亮[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]宝山钢铁股份有限公司特殊钢分公司,上海200940

出　　处：《机械工程材料》2009年第12期43-45,共3页Materials For Mechanical Engineering

基　　金：国家科技支撑计划资助项目(2007BAE51B04);上海市科技登山计划资助项目(065211028)

摘　　要：在国外GP奥氏体热作模具钢的基础上,降低了铬和钼的含量,提高了硅和锰的含量,研制了一种新型的奥氏体热作模具钢;在相同的冶炼、锻造和热处理条件下,对两种钢的显微组织、力学性能及750℃下的热稳定性进行了对比。结果表明:两种钢的纵向冲击韧性相当,而试验钢的横向冲击韧性明显优于GP钢的,具有更好的等向性;试验钢的抗拉强度、塑性均略高于GP钢的;750℃保温20 h过程中,两种钢的硬度基本保持稳定,且试验钢始终比GP钢高约2 HRC。A new austenitic hot die steel was produced by decreasing Cr, Mo contents and increasing Si, Mn contents to compare with foreign GP steel. The mechanical properties, microstructure and the thermostability at 750 ℃ of the two steels were investigated after treated at the same smelting, forging and heat treatment conditions. The results indicate that they had similar vertical impact toughness, while the horizontal impact toughness of testing steels was superior to GP steel, that testing steel had better isotropic property. Its tensile strenghth and ductility property of testing steel were better than that of GP steel, Both the hardnesses kept stable at 750 ℃ for 20 h, and the hardness of testing steel was about 2 HRC higher than that of GP steel during thermostability test.

关 键 词：奥氏体热作模具钢 GP钢 力学性能 热稳定性 

分 类 号：TG142.2[一般工业技术—材料科学与工程]