29CrMo钢连续冷却转变曲线的测定  

Determination of continuous cooling transformation curve of 29CrMo steel

作　　者：孙忍 徐磊 李珺 俞良玉 黄贵军 SUN Ren;XU Lei;LI Jun;YU Liangyu;HUANG Guijun(Jiangsu Changbao Precision Steel Tube Co.,Ltd.,Changzhou 213200,China;Jiangsu Changbao Steel Tube Co.,Ltd.,Changzhou 213000,China)

机构地区：[1]江苏常宝普莱森钢管有限公司,常州213200 [2]江苏常宝钢管股份有限公司,常州213000

出　　处：《理化检验（物理分册）》2024年第10期47-51,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：采用热模拟试验机测定了29CrMo钢的不同冷却速率连续冷却时的膨胀曲线,同时结合金相检验和硬度测试结果,分析了29CrMo钢在不同冷却速率时的显微组织和硬度。结果表明:当冷却速率为0.1~2℃/s时,随着冷却速率的增大,组织中铁素体和珠光体占比逐渐减小,贝氏体占比增大;冷却速率为2~20℃/s时,随着冷却速率的进一步增大,组织中贝氏体占比减小,马氏体占比增大;同时硬度随冷却速率的增大而不断增大,当冷却速率大于10℃/s时,硬度变化趋于稳定;马氏体相变的临界冷却速率为10~15℃/s。The expansion curves of 29CrMo steel at different cooling rates were measured by thermal simulation testing machine.At the same time,the microstructure and hardness of 29CrMo steel at different cooling rates were analyzed by metallographic examination and hardness test.The results show that when the cooling rate was 0.1-2℃/s,with the increase of cooling rate,the proportion of ferrite and pearlite in the microstructure decreased gradually,and the proportion of bainite increased.When the cooling rate was 2-20℃/s,with the further increase of the cooling rate,the proportion of bainite in the microstructure decreased and the proportion of martensite increased.At the same time,the hardness increased with the increase of cooling rate.When the cooling rate was greater than 10℃/s,the hardness change tended to be stable.The critical cooling rate of martensitic transformation was 10-15℃/s.

关 键 词：29CrMo钢 热模拟 显微组织 硬度 连续冷却转变曲线 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—金属材料]