20Cr1Mo1VTiB螺栓钢长期时效的组织演变及其力学性能  

Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel during long-term aging

作　　者：杨滨 王维康 赵吉庆[2] 杨钢[2] YANG Bin;WANG Weikang;ZHAO Jiqing;YANG Gang(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《南昌工程学院学报》2023年第6期6-11,共6页Journal of Nanchang Institute of Technology

基　　金：国家863计划重大项目(2012AA03A507,2008AA031702);北京市自然科学基金资助项目(216206)。

摘　　要：20Cr1Mo1VTiB螺栓钢常用于钠冷快堆蒸汽发生器紧固件,服役温度约530℃。该钢在530℃时效100~10000 h的组织演变结果显示,时效过程中碳化物尺寸未见明显增大。随时效时间延长,MC相增多,贝氏体板条边界逐渐模糊,板条宽度逐渐增加。时效过程中力学性能未见大幅度下降,表明其在530℃服役环境下可长期使用。20Cr1Mo1VTiB bolt steel is commonly used for fasteners of sodium cooled fast reactor steam generators,with a service temperature of about 530℃.The microstructure evolution results of the steel aged at 530℃for 100-10000 hours show that there is no significant increase in carbide size during the aging process.With the increase of aging time,the MC phase increases,the boundary of bainite flat noodles gradually blurs,and the width of flat noodles gradually increases.During the aging process,there was no significant decrease in mechanical properties,indicating that it can be used for a long time under a service environment of 530℃.

关 键 词：低碳低合金钢 紧固件 时效 力学性能 

分 类 号：TG161[金属学及工艺—热处理]