时效处理对15-5PH不锈钢室温和低温力学性能的影响  

Effect of aging treatment on mechanical properties at room temperature and low temperature of 15-5PH stainless steel

作　　者：徐锋 孙强 贾云浩 Xu Feng;Sun Qiang;Jia Yunhao(BAOWU Special Metallurgy Co.,Ltd.,Shanghai 200940,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]宝武特种冶金有限公司,上海200940 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《金属热处理》2024年第9期191-197,共7页Heat Treatment of Metals

摘　　要：对15-5PH沉淀硬化不锈钢在1040℃保温1 h固溶处理后,进行480℃保温不同时间(1、2、4 h)的时效处理,并对其显微组织、断口形貌和性能进行观察和测试,研究时效时间对其室温和-50℃低温力学性能的影响。结果表明,随时效时间延长,15-5PH钢室温拉伸性能和冲击性能变化不明显;-50℃拉伸性能变化也不明显,但冲击性能显著提高,冲击吸收能量从31.5 J提高到77.5 J,归因于时效保温时间越长,钢中逆转变奥氏体含量越高,导致低温冲击性能越好。15-5PH precipitation-hardened stainless steel was solution treated at 1040 ℃ for 1 h,and then aged at 480 ℃ for different time(1,2,4 h).The microstructure,fracture morphology and properties were observed and tested to study the effect of aging time on its mechanical properties at room temperature and-50 ℃.The results show that the tensile and impact properties of the 15-5PH steel at room temperature don't change significantly with the aging time increasing.The tensile properties at-50 ℃ have no obvious change,but the impact absorbed energy is significantly improved,the impact absorbed energy is increased from 31.5 J to 77.5 J,due to the longer the aging holding time,the higher the reversed austenite content in the steel,resulting in better low-temperature impact property.

关 键 词：15-5PH沉淀硬化不锈钢 时效处理 组织 力学性能 

分 类 号：TG156[金属学及工艺—热处理]