17-4PH不锈钢350℃长期时效组织演化的透射电镜观察  

Study on Microstructure Transformation of 17-4PH Stainless Steel after Long-Term Aging at 350℃

作　　者：邹红[1] 王均[2] 李聪[1] 左汝林[3] 邱绍宇[1] 沈保罗[2] 

机构地区：[1]中国核动力研究设计院核燃料及材料国家重点实验室,成都610041 [2]四川大学材料科学与工程学院,成都610064 [3]重庆大学材料学院,400044

出　　处：《核动力工程》2005年第4期397-401,409,共6页Nuclear Power Engineering

基　　金：核燃料及材料国家重点实验室基金资助(51481080104ZS8501)

摘　　要：采用X-ray衍射(XRD)和透射电镜(TEM)研究了17-4PH马氏体沉淀硬化不锈钢在350℃长期时效过程中显微组织的变化规律。结果表明:在沉淀硬化回火处理后,在典型的板条马氏体基体中弥散分布着大量的纳米级的ε-Cu颗粒,二次碳化物M23C6沿马氏体板条束界析出。17-4PH马氏体不锈钢在350℃时效6个月后,组织发生一定变化,spinodal分解开始在晶界发生,另外析出的ε-Cu颗粒逐渐长大,并且有少量的逆转变奥氏体产生。17-4PH不锈钢在350℃时效15个月后,spinodal分解逐渐由晶界发生转向晶内,基体中析出大量有取向的细小的G相,并观测到少量sigma相。基体仍为板条马氏体。The transformation of microstructure with the extension of aging time on the type of 17-4PH stainless steel at 350℃ was studied in this paper by X-ray diffraction and transmission electron microscope.The results showed that there was the matrix of lath martensite and the nano-metric precipitates of ε-Cu and secondary carbide, M23C6, after the type alloy subjected to solution treatment and temper treatment.When the alloy aged at 350℃ for about 4200h, the α-α’ spinodal decomposition occurred along the grain boundary and some reversed austenite was transformed. With the age time extended to 11000h, the spinodal decomposition and G-phase, which consisted of complex nickel silicide, precipitation occurred in matrix at this intermediate temperature. Some sigma phase was also observed.

关 键 词：17—4PH不锈钢 等温时效 组织演化 SPINODAL分解 G相 

分 类 号：TL7[核科学技术—辐射防护及环境保护]