火烧温度和冷却方式对12Cr1MoV钢显微组织和力学性能的影响  

Effect of Burning Temperature and Cooling Way on Microstructure and Mechanical Properties of 12Cr1MoV Steel

作　　者：李小凯 关凯书(导师)[1] LI Xiaokai;GUAN Kaishu(Key Laboratory of Pressure System and Safety(MOE),School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学机械与动力工程学院,承压系统安全科学教育部重点实验室,上海200237

出　　处：《机械工程材料》2023年第3期31-36,共6页Materials For Mechanical Engineering

基　　金：国家磁约束核聚变能发展研究专项资助项目(2022YFE03120000)。

摘　　要：将12Cr1MoV钢加热至不同温度(650,750,850,950,1050,1150℃)保温3 h并分别进行空冷和水冷来模拟火灾现场的火烧过程,采用金相检测、小冲杆试验、拉伸试验和硬度测试研究了火烧温度和冷却方式对试验钢显微组织和力学性能的影响。结果表明:当火烧温度不高于750℃时,空冷和水冷方式下试验钢的显微组织均主要为铁素体、珠光体和碳化物,强度、断后伸长率和硬度随火烧温度的变化很小;在空冷方式下,当火烧温度高于750℃时,随着火烧温度升高,试验钢的晶粒尺寸变大,珠光体含量增加,使得强度增大,断后伸长率降低;在水冷方式下,当火烧温度高于750℃时,试验钢组织中出现马氏体,随着火烧温度升高,马氏体含量增加,试验钢强度和硬度提高,断后伸长率降低。12Cr1MoV steel was heated to different temperatures(650,750,850,950,1050,1150°C)for 3 h and then air-cooled and water-cooled,respectively,to simulate the burning process at fire sites.The effect of the burning temperature and cooling way on the microstructure and mechanical properties of the test steel was studied by metallographic inspection,small punch tests,tensile tests and hardness measurement.The results show that when the fire temperature was not higher than 750℃,the microstructure of the test steel mainly consisted of ferrite,pearlite and carbide under air cooling and water cooling,and the change of strength,percentage elongation after fracture and hardness was small with the burning temperature.Under air cooling,when the burning temperature was higher than 750℃,the test steel experienced an increase in grain size and pearlite conten,leading to an increase in strength and a decrease in percentage elongation after fracture.Under water cooling,when the burning temperature was higher than 750℃,martensite appeared in the structure of the test steel.The content of martensite increased with the burning temperature rising,resulting in an increase in strength and hardness and a decrease in percentage elongation after fracture of the test steel.

关 键 词：12CR1MOV钢 小冲杆试验 火烧温度 冷却方式 强度 显微组织 

分 类 号：TB132.3[理学—物理]