时效温度对沉淀硬化不锈钢FV520(B)组织及低温力学性能的影响  

Effects of Aging Temperature on Microstructure and Low Temperature Mechanical Properties of FV520(B) Steel

作　　者：张敏[1] 黄晓江[1] 李继红[1] 赵宾灵[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《热加工工艺》2010年第20期149-151,155,共4页Hot Working Technology

基　　金：西安市科技计划资助项目(cxy09024)

摘　　要：采用扫描电镜、X射线衍射、金相试验和低温力学性能试验等方法,研究了时效温度对沉淀硬化不锈钢FV520(B)的组织和低温力学性能的影响。结果表明:在470℃时效,硬度出现峰值,主要与组织中细小的富铜相共格析出有关;随时效温度的升高,600℃时效时,冲击韧度最佳,此时残余奥氏体量最多;470℃及560℃时效时的冲击断口扩展区断口以准解理形貌为主,而其他时效状态下为韧窝形貌,但韧窝细节各不相同。The effects of aging temperature on microstructure and low temperature mechanical properties of precipitation-hardening stainless steel FV520（B） were studied by SEM,XRD and low temperature tensile test.The results show that the hardness reaches a peak value aging at 470 ℃ due to fine copper-rich phase precipitating.With aging temperature increasing,the residual austenite quantitation and impact ductility all reach the highest level at 600℃.However,the fracture appearance of the impact specimens,aged at 470 ℃ and 560 ℃,is mainly quasi-cleavage fracture,while those of the specimens aged at other temperatures are dimples.The dimples cleavage and mixed fracture has differences surface topography in detail.

关 键 词：沉淀硬化 时效处理 微观组织 力学性能 

分 类 号：TG156.92[金属学及工艺—热处理]