回火温度对高压气瓶用钢34CrMo4屈强比的影响  

Effect of Tempering Temperature on Yield Ratio of 34CrMo4 Steel for High Pressure Gas Cylinder

作　　者：贾军军 李秋琴 杨刚[1] 尹管彬 杨屹[1] 张雨源 范俊明 JIA Junjun;LI Qiuqin;YANG Gang;YIN Guanbin;YANG Yi;ZHANG Yuyuan;FAN Junming(School of Mechanical Engineering,Sichuan University,Chengdu 610065,China;Chengdu Great High Pressure Vessel Co.,Ltd.,Chengdu 610400,China)

机构地区：[1]四川大学机械工程学院,四川成都610065 [2]成都格瑞特高压容器有限责任公司,四川成都610400

出　　处：《热加工工艺》2022年第24期129-133,141,共6页Hot Working Technology

基　　金：四川大学-宜宾市人民政府市校战略合作项目(2019CDYB-11-SCU)。

摘　　要：采用770℃进行亚温淬火且用不同回火温度对高压气瓶用钢34CrMo4进行热处理,然后借助OM、SEM、XRD以及JMatPro等手段研究了不同回火温度对34Cr Mo4钢组织及屈强比的影响。结果表明:不同回火温度处理后得到回火索氏体+铁素体组织,屈强比相对调质处理后的明显降低;随着回火温度的升高,铁素体相占比基本不变,晶格畸变程度相似,M_(3)C和M_(2)(C,N)发生回溶,M_(23)C_(6)和M_(7)C_(3)长大,在630℃时变化最明显,因此钢的抗拉强度逐渐降低,屈服强度及屈强比均先增加后降低,屈强比在630℃时得到最小值0.776。The microstructure and yield ratio of 34CrMo4 steel for high-pressure gas cylinder after water intercritical quenching at 770℃and tempering at different temperatures were studied by OM,SEM,XRD and JMatPro.The results show that tempering temperature is different,the tempered sorbite+ferrite microstructure is obtained,and the yield ratio is significantly lower compared with the sample after the quenching+tempering process.With the increase of tempering temperatures,the volume of ferrite is basically unchanged,lattice distortion degree is similar,M_(3)C and M_(2)(C,N) are re-dissolved,M_(23)C_(6)and M_(7)C_(3)grow up,and these changes are most obvious at 630℃.Therefore,the tensile strength of the material decreases gradually,the yield strength first increases and then decreases,and the yield ratio first increases and then decreases,which reach a minimum value of 0.776 at 630℃.

关 键 词：34CrMo4钢 屈强比 回火温度 

分 类 号：TG161[金属学及工艺—热处理]