【作者】 马海涛； 赵艳辉； 王来； 孙长海；

【Author】 MA Hai-tao~1,ZHAO Yan-hui~1,WANG Lai~1,SUN Chang-hai~2 (1.School of Material Science and Engineering,Dalian University of Technology,Dalian 116085,China; 2.School of Electrical Engineering,Dalian University of technology,Dalian 116085,China)

【机构】 大连理工大学材料科学与工程学院； 大连理工大学电气工程学院；

【摘要】 采用金相显微镜、硬度仪、拉伸机和扫描电镜对在700℃下服役8万小时的AISI 321不锈钢固溶处理后显微组织和室温性能的转变进行了研究。结果表明:在1050℃下固溶处理使服役后AISI 321不锈钢中的σ相逐渐溶解,σ相的含量明显减少;固溶处理后显微硬度明显降低;固溶处理使服役后的AISI 321不锈钢抗拉强度明显降低(从690MPa降至610MPa),断后伸长率升高(从32%上升为60%),断裂形式从脆性断裂转变为韧性断裂。更多还原

【Abstract】 The methods of metallographic microscope,Vickershardness tester,the stretcher and scanning electron microscope was used toanalysis the changes of the microstructure and the properties of AISI 321 stainless steel service for 80000 hours at 700℃after solution treatment.The results show that:after solution treatment at the temperature of 1050℃,sigma phase in AISI 321 stainless steel gradually dissolve,and the content of sigma phase is obviously reduced;after solution treatment,the microhardness of AISI 321 stainless steel is decrease clearly;the tensile strength of AISI 321 stainless steel service is reduced(from 690 MPa down to 610 MPa),the elongation is increased(from 32%up to 60%),and the fracture mode change from brittle fracture into ductile fracture.更多还原