热处理对20Cr25Ni11Mo3CuWV不锈钢组织和硬度的影响  

Effect of heat treatment on microstructure and hardness of a duplex 20Cr25Ni11Mo3CuWV stainless steel

作　　者：赵忠魁[1] 潘英才[1] 高青[1] 张恒凯 

机构地区：[1]山东建筑大学科学与工程学院,山东济南250101

出　　处：《材料热处理学报》2014年第2期116-120,共5页Transactions of Materials and Heat Treatment

基　　金：山东省科学技术发展计划(2010GGX10328)

摘　　要：通过对高碳双相不锈钢20Cr25Ni11Mo3CuWV进行不同温度固溶处理和时效处理,后采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对其进行组织变化分析,并通过硬度试验探究了不同固溶和时效温度对合金硬度的影响。结果表明:该双相不锈钢经固溶处理后,组织中残留颗粒状组织为铬碳化物,当固溶温度达到1250℃时都不能使其完全溶解;随固溶温度升高,铁素体含量不断增加,在1150℃时合金硬度值最低(25.8 HRC);合金在1150℃固溶处理后,再经不同温度时效处理,会出现两个硬度峰值,分别对应在450℃(38.1 HRC)和700℃(52.9 HRC)时。前者是因为铁素体相中发生调幅分解析出了具有共格关系的富铬相和富铁相,后者则主要是在铁素体相中因共析转变连续均匀析出了大量的σ相。Solution and aging treatment of 20Cr25Nill Mo3CuWV steel were performed at different temperatures. Microstructure evolution and properties of the steel were examined by means of OM, SEM, EDS analysis, XRD and hardness measurement. The results show that a large number of granular chromium carbides precipitated in the the solution-treated steel is observed, and the chromium carbides can not he completely dissolved even solution-treated at 1250 ℃. When solution-treated at 1150 ℃ , the hardness value of the steel is the lowest, and then aging treatment at temperature of 200 -800 ℃ , two hardness peaks occur, at 450 ℃ （38. 1 HRC） and 700 ℃ （52.9 HRC）. The former is due to the occurrence of spinodal decomposition in the ferrite, while the latter is mainly ascribed to the precipitation of a large number of cr phase in the ferrite.

关 键 词：高碳双相不锈钢 铬碳化物 调幅分解 Σ相 

分 类 号：TG142.71[一般工业技术—材料科学与工程]