沉淀硬化不锈钢PH15-7Mo的时效行为  

Aging behavior of PH15-7Mo precipitation-hardening stainless steel

作　　者：陈国辉 张小聪 罗承萍[2] 刘江文[2] 刘志坚 

机构地区：[1]广州市机电工业研究所,广东广州510663 [2]华南理工大学材料科学与工程学院,广东广州510640 [3]广东省钢铁研究所,广东广州510640

出　　处：《金属热处理》2010年第7期54-57,共4页Heat Treatment of Metals

基　　金：广东省科技三项经费计划项目(2004B10301004)

摘　　要：用光学金相显微镜、X射线衍射仪、扫描电子显微镜和透射电子显微镜等研究不同时效温度下PH15-7Mo钢的组织,用洛氏硬度计测试钢的力学性能。结果表明,PH15-7Mo钢时效后组织由马氏体和铁素体组成,时效时析出弥散分布的碳化物和沉淀相,使钢的硬度增加;当时效温度为510℃时,钢的硬度达到峰值;时效温度超过590℃,由于碳化物的分解长大和逆奥氏体的出现使钢的硬度下降明显。Microstructure of PH15-7Mo steel aged at different temperatures was studied by metallographic microscope,X-ray diffractometer,scanning electron microscope and transmission electron microscope,and properties were tested by Rockwell hardness.The results show that the microstructure of PH15-7Mo steel after aging is composed of martensite and δ-ferrite.Hardness of the steel increases because of the precipitation of diffuse distribution carbide and precipitated phase.The hardness is highest when the steel is aged at 510 ℃,and sharply decreases because of the decomposer and growing up of carbide and the appearance of reverted austenite when aging temperture is over 590 ℃.

关 键 词：PH15-7Mo钢 沉淀硬化不锈钢 时效 硬度 

分 类 号：TG156.92[金属学及工艺—热处理]