固溶温度对22Cr双相不锈钢组织与性能的影响  

Effect of solution temperature on microstructure and properties of 22Cr duplex stainless steel

作　　者：雒设计[1] 王荣[1] 严长亮[2] 陈尧[3] 

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]中国石油天然气集团公司管材研究所,陕西西安710065 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2010年第8期66-71,共6页Transactions of Materials and Heat Treatment

摘　　要：采用金相显微镜、扫描电镜、能谱分析、透射电镜和性能测试等方法,研究了固溶温度对22Cr双相不锈钢显微组织和性能的影响。结果表明:在950～1150℃范围,实验钢中α、γ两相含量与固溶温度呈近似直线关系;材料的显微硬度(HV)和强度(σb)先降后升,在1050℃时达到最小值;当固溶温度为950℃,组织中出现了σ相,σ相是导致22Cr双相不锈钢塑性、韧性下降的主要原因;随着固溶温度的升高,Cr、Mo的分配系数K变小,Ni的分配系数K增大,表明合金元素在α和γ相中浓度差别变小。Effects of solution temperature on microstructure and properties of 22Cr duplex stainless steel were studied by means of optical microscopy （OM）,scanning electron microscopy （SEM） with EDS analysis,transmission electron microscopy （TEM）,tensile and impact tests.The results show that the content of α phase and γ phase is linearly dependent on the solution temperature in the range of 950-1150 ℃ .The micro-hardness and strength of 22Cr duplex stainless steel decrease to the lowest values at 1050 ℃ and then increase with the increase of annealing temperature.The σ phase is found in the microstructure of the steel solution-treated at 950 ℃ ,leading to the decrease of plasticity and toughness.With increase of solution temperature,the partition coefficient of Cr and Mo decreases,but that of Ni increase,indicating that concentration difference of alloying elements in α and γ phase becomes smaller.

关 键 词：22Cr双相不锈钢 固溶温度 Σ相 分配系数 

分 类 号：TG142.7[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]