一种超高强度马氏体时效不锈钢的组织转变对力学性能的影响  

Effect of Structure Transformation in a Ultra-high Strength Maraging Stainless Steel on Its Mechanical Properties

作　　者：刘振宝[1] 杨志勇[1] 李全安[2] 梁剑雄[1] 宋为顺[1] 

机构地区：[1]北京钢铁研究总院,北京100081 [2]河南科技大学材料学院,河南洛阳471003

出　　处：《热处理》2005年第3期11-16,22,共7页Heat Treatment

基　　金：国家高技术研究发展计划(863)

摘　　要：研究了强度级别为1900MPa的新型马氏体不锈钢在经过不同制度的热处理后的微观组织及其对钢力学性能的影响。试验钢经1000℃固溶处理后在基体上有一种富Mo的析出物生成,这种析出物降低了钢时效后的韧性。经1000℃,1050℃固溶处理+负温处理后,试验钢在535℃时效处理时强度均达到最大值,原因是在高密度位错的板条马氏体和残余奥氏体基体上析出均匀弥散、细小的强化相。随着时效温度继续升高强度开始下降,其原因有二,其一析出相聚集长大,破坏了与基体间原有的共格关系;其二逆转变奥氏体转变量的增加。Effect of mierostructures in a new-type martensitic stainless steel with strength level of 1900 MPa and heat-treated by different processes on its mechanical properties has been studied. A molybdenum-enriched precipitate will produce in matrix of the tested steel solution-treated at 1000℃, with the toughness of the steel after being aged reduced, After being solution-treated at 1000℃, 1050℃ and subsequent subzero treating the steel aged at 535 ℃ possesses maximum strength, which stems from uniformly precipitating fine and disperse strengthening phase in both lath martensite with high density dislocation and residial austenite. With further increase in aging temperature the strength will decrease,which rusults from the following two reasons： （1）Coarsening of the precipitated phase destroys coherent relation with the matrix; （2） Reverted austenite content increases.

关 键 词：时效 马氏体板条 位错 析出相 力学性能 

分 类 号：TG142.24[一般工业技术—材料科学与工程]