06Cr25Ni20奥氏体耐热钢高温拉伸断裂行为  

Fracture behavior of 06Cr25Ni20 austenitic heat-resistant steel at high tensile temperature

作　　者：王储 艾芳芳 潘凯华[3] 颜秉宇 胡海洋 高天宇 王勇 Wang Chu;Ai Fangfang;Pan Kaihua;Yan Bingyu;Hu Haiyang;Gao Tianyu;Wang Yong(State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan Liaoning 114009,China;Ansteel Iron&Research Institute,Anshan Liaoning 114009,China;Angang Steel Co.,Ltd.,Anshan Liaoning 114009,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团钢铁研究院,辽宁鞍山114009 [3]鞍钢股份有限公司,辽宁鞍山114009

出　　处：《金属热处理》2024年第12期289-294,共6页Heat Treatment of Metals

基　　金：辽宁省科技重大专项(2019JH1/10100001)。

摘　　要：采用光学显微镜、扫描电镜、透射电镜和高温激光共聚焦显微镜,分析了不同高温拉伸温度下06Cr25Ni20奥氏体耐热钢静态和动态组织演变规律及断裂行为。结果表明:在600~1000℃范围内,随着拉伸试验温度的提高,试验钢的屈服强度由180 MPa降至40 MPa、抗拉强度由450 MPa降至50 MPa、断后伸长率由44%提升至56%。断裂形式为韧性断裂,韧窝数量随温度升高逐渐减少,尺寸和深度逐渐增大;显微组织发生再结晶现象,第二相黑色碳化物及晶内亚结构随温度提高而减少甚至消失。当试验钢高温拉伸时,裂纹的形成和断裂主要在奥氏体与δ铁素体相界面和高能晶界处产生。Static and dynamic microstructure evolution and fracture behavior of the 06Cr25Ni20 austenitic heat-resistant steel at different high temperature tensile temperatures were analyzed by means of optical microscope,scanning electron microscope,transmission electron microscope and high temperature laser confocal microscope.The results show that the yield strength of the tested steel decreases from 180 MPa to 40 MPa,the tensile strength decreases from 450 MPa to 50 MPa,and the elongation after fracture increases from 44%to 56%with the increase of tensile test temperature in the rang of 600-1000℃.The fracture is ductile.The number of dimples gradually decreases with the increase of temperature,and the size and depth gradually increase.The recrystallization phenomenon occurs in the microstructure,and the secondary phase black carbide and intragranular substructure decrease or even disappear with the temperature increasing.The formation of cracks and fracture are mainly generated at the interface between austenite and ferrite and high energy grain boundaries when the tested steel is stretched at high temperature.

关 键 词：奥氏体耐热钢 原位观察 韧窝 晶界 

分 类 号：TG142.73[一般工业技术—材料科学与工程]