热处理对W-Mo-V系改进型热作模具钢组织及力学性能的影响  

Effect of heat treatment on microstructure and mechanical properties of W-Mo-V series improved hot work die steel

作　　者：郑琦[1] 袁飞 杜京伦 蒋沁洋 丁恒楠 程晓农[1] ZHENG Qi;YUAN Fei;DU Jing-lun;JIANG Qin-yang;DING Heng-nan;CHENG Xiao-nong(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《材料热处理学报》2022年第9期94-102,共9页Transactions of Materials and Heat Treatment

基　　金：江苏省重点研发计划(产业前瞻与共性关键技术)(BE2017127);江苏省研究生科研创新项目(KYLX15_1057)。

摘　　要：利用光学显微镜(OM)、扫描电镜(SEM)和力学性能测试等研究了不同热处理工艺参数对新型W-Mo-V系热作模具钢(以下简称HBJ2钢)显微组织与力学性能的影响,并与常规H13钢对比,分析其强化机制。结果表明:HBJ2钢等温球化退火后碳化物均匀弥散,偏析改善效果显著;HBJ2钢在650℃回火时仍能观察到少量回火马氏体,表明其回火稳定性较好;此外,HBJ2钢还具有优异的回火二次硬化性能,在550℃左右回火出现硬度峰值;经1040℃淬火+550℃回火后,HBJ2钢的强韧匹配达到最佳,在650℃下的高温强度表现优异,抗拉强度和屈服强度分别达到718 MPa和646 MPa,与经相同热处理工艺处理后的H13钢相比,分别提高了23%和21%。Effect of different heat treatment processes on microstructure and mechanical properties of a new W-Mo-V series hot work die steel(hereinafter referred to as HBJ2 steel)was studied by means of optical microscope(OM),scanning electron microscopy(SEM)and mechanical properties test,and compared with H13 steel to analyze the strengthening mechanism.The results show that after isothermal spheroidizing annealing,the carbides of the HBJ2 steel are uniformly dispersed and the segregation is significantly improved.When the HBJ2 steel is tempered at 650℃,a small amount of tempered martensite can still be observed,indicating that its tempering stability is good.In addition,the HBJ2 steel also has excellent tempering secondary hardening property,and the hardness peak appears in about 550℃tempering.After quenching at 1040℃and tempering at 550℃,the strength toughness matching of the HBJ2 steel is the best,the high temperature strength at 650℃is excellent,and the tensile strength and yield strength reach 718 MPa and 646 MPa,respectively,which are increased by 23%and 21%respectively compared with the H13 steel treated by the same heat treatment process.

关 键 词：热作模具钢 合金化 显微组织 力学性能 二次硬化 

分 类 号：TG142.3[一般工业技术—材料科学与工程]