淬火工艺对无变形40Mn钢带组织及性能的影响  

Influence of the quenching process on the microstructure and property of non-deformation 40Mn steel strip

作　　者：邬晓燕[1] 骆仁智 杨志强 严小强[1] 陈红雨[1] 朱施利[1] WU Xiao-yan;LUO Ren-zhi;YANG Zhi-qiang;YAN Xiao-qiang;CHEN Hong-yu;ZHU Shi-li(Manufacturing Management Department,Ningbo Iron and Steel Co.,Ltd.,Ningbo 315807,China)

机构地区：[1]宁波钢铁有限公司制造管理部

出　　处：《物理测试》2018年第6期6-10,共5页Physics Examination and Testing

摘　　要：采用不同淬回火工艺处理无变形40Mn钢带,对比了不同淬火温度、加热时间和淬火介质对转变组织和性能的影响,并分析了退火与马氏体相变驱动力之间的关系。结果表明:淬火温度从840℃增加到940℃时,回火屈氏体转变程度逐渐增加,且从890℃开始转变明显;抗拉强度(Rm)、屈服强度(Rel)分别提升339 MPa和387 MPa,而伸长率(A)降低9.1%。淬火加热时间从10 min延长到30 min时,相变转化更加充分,回火屈氏体组织逐渐得到细化;与油淬相比,水淬后残余奥氏体少,组织更细小,抗拉强度提升102 MPa,伸长率降低1.9%。延长淬火加热时间和采用球化退火可提升马氏体转变量,但马氏体最大转变量存在极值淬火加热时间。The non-deformation 40 Mn steel strip was treated by different quenching and tempering technology,and the influence of different quenching temperature,heating time and quenching medium on the microstructure and property were compared,and the relationship between annealing and phase transition dynamics of martensite was analyzed. The results showed that the transformation degree of tempered troostite was increased gradually when increasing the quenching temperature from 840 ℃ to 940 ℃,and the variation became significantly from 890 ℃. The tensile strength(Rm)and yield strength(Rel)was increased by 339 MPa and 387 MPa,respectively,while the elongation(A)was decreased by 9.1%. When the heating time of quenching was extended from 10 min to 30 min,the phase transformation was more sufficient and the tempered troostite was refined gradually. Compared with oil quenching,the residual austenite was less and the microstructure was smaller after water quenching,and the tensile strength was increased by 102 MPa,while the elongation was decreased by 1.9%. Extending quenching heating time and adopting spheroidizing annealing could improve the transformation quantity of martensite,but there was an extreme quenching heating time for the maximal change quantity of martensite.

关 键 词：40Mn 无变形 淬火工艺 组织 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.3[金属学及工艺—金属材料]