Q&P工艺对5CrMnNiMo超高强度钢组织及性能的影响  

Effect of Q&P process on microstructure and properties of 5CrMnNiMo ultra-high strength steel

作　　者：索忠源[1] 杜阳 付立铭[2] 单爱党[2] Suo Zhongyuan;Du Yang;Fu Liming;Shan Aidang(College of Mechanical and Electrical Engineering,Jilin Institute of Chemical Technology,Jilin Jilin 132022,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]吉林化工学院机电工程学院,吉林吉林132022 [2]上海交通大学材料科学与工程学院,上海200240

出　　处：《金属热处理》2022年第5期217-220,共4页Heat Treatment of Metals

基　　金：吉林省教育厅项目(JJKH20210232KJ);吉林化工学院重大项目(2020020)。

摘　　要：对5CrMnNiMo超高强度钢进行了淬火-配分(Q&P)处理,利用SEM、电子万能试验机、X射线衍射仪、EBSD等试验手段,探讨了试验钢的显微组织和力学性能随Q&P工艺中等温配分5 min、24 h及非等温配分6 h后的变化规律。结果表明,Q&P处理过程中,显微组织均由马氏体+残留奥氏体+少量粒状碳化物组成,随着等温配分时间的延长,残留奥氏体由片状逐渐转变为块状;等温配分5 min后,获得高达2230 MPa的超高抗拉强度,抗拉强度经等温配分24 h后降低到1360 MPa;塑性变形量由等温配分5 min后的3.92%增加到非等温配分6 h后的14.62%,TRIP效应是塑性变形量增加的主要原因。Quenching and partitioning(Q&P) process was performed for 5 CrMnNiMo ultra-high strength steel. The changes of microstructure and mechanical properties of the tested steel with isothermal partitioning for 5 min, 24 h and non-isothermal partitioning for 6 h under Q&P process were investigated by means of SEM, electronic universal testing machine, X-ray diffraction and EBSD. The results show that during Q&P treatment, the microstructure is composed of martensite, retained austenite and a small amount of granular carbide. The retained austenite gradually transforms from flake to block with the prolongation of isothermal partitioning time. After isothermal partitioning for 5 min, the ultra-high tensile strength of 2230 MPa is obtained. The tensile strength is decreased to 1360 MPa after isothermal partitioning for 24 h and the plastic deformation is increased from 3.92%(isothermal partitioning time of 5 min) to 14.62%(non-isothermal partitioning time of 6 h). The TRIP effect is the main reason for the increase of plastic deformation.

关 键 词：Q&P工艺 超高强度钢 微观形貌 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]