摘要
采用光学显微镜、电子万能试验机和晶间腐蚀试验等研究了终锻温度对核电用316L奥氏体不锈钢显微组织、力学性能及耐晶间腐蚀性能的影响。结果表明:当始锻温度为940℃,终锻温度为830℃时,试验钢的晶粒度为4.5~5级,比终锻温度860℃和890℃的样品分别高0.5级和1级。终锻温度为830℃的样品在室温下抗拉强度达到574 MPa,360℃高温下抗拉强度为446 MPa,室温下冲击吸收能量达到388 J。随着终锻温度的降低,试验钢的抗拉强度、屈服强度及冲击吸收能量升高,室温及高温伸长率变化不显著。终锻温度在830~890℃范围内,试验钢的耐晶间腐蚀性能良好,终锻温度为860℃的试验钢耐晶间腐蚀性能最佳,再活化率最小。
Effect of final forging temperature on microstructure,mechanical properties and intergranular corrosion resistance of 316 L austenitic stainless steel for nuclear power was studied by means of optical microscope,electronic universal testing machine and intergranular corrosion test.The results show that when the initial forging temperature is 940℃and the final forging temperature is 830℃,the grain size grade of the experimental steel is 4.5-5,which is 0.5 and 1 grade higher than that of the final forging temperature of 860℃and 890℃,respectively.The room temperature tensile strength of the sample with final forging temperature of 830℃is 574 MPa,the tensile strength at 360℃is 446 MPa,and the impact absorbed energy is 388 J.With the decrease of the final forging temperature,the tensile strength,yield strength and impact absorbed energy of the experimental steel increase,the change of the elongation at room temperature and high temperature is not significant.When the final forging temperature is in the range of 830-890℃,the change of the experimental steel has good intergranular corrosion resistance,and the experimental steel with final forging temperature of 860℃has the best intergranular corrosion resistance,the reactivation rate is the smallest.
作者
杨晓萱
孙文伟
赵亚军
孙令仪
王均亚
毛向阳
YANG Xiao-xuan;SUN Wen-wei;ZHAO Ya-jun;SUN Ling-yi;WANG Jun-ya;MAO Xiang-yang(College of Material Science and Engineering,Nanjing Institute of Techology,Nanjing 211167,China;Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing 211167,China;Jiangsu Biaoxin Industrial Co Ltd,Jingjiang 214536,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2021年第3期135-141,共7页
Transactions of Materials and Heat Treatment
关键词
奥氏体不锈钢
显微组织
锻造温度
耐晶间腐蚀
austenitic stainless
microstructure
forging temperature
intergranular corrosion resistance
