5CrNiMoLaSr模具钢的组织与性能  

Microstructure and properties of 5CrNiMoLaSr die steel

作　　者：何润琴 常秋香 He Runqin;Chang Qiuxiang(College of Digital Technology and Engineering,Ningbo University of Finance and Economics,Ningbo 315175,China;School of Mechanical Engineering and Automation,College of Science and Technology Ningbo University,Ningbo 315212,China)

机构地区：[1]宁波财经学院数字技术与工程学院,浙江宁波315175 [2]宁波大学科学技术学院机械工程与自动化学院,浙江宁波315212

出　　处：《锻压技术》2024年第12期243-249,共7页Forging & Stamping Technology

基　　金：浙江省教育厅普通本科高校“十四五”教学改革项目(jg20220628);浙江省公益项目(GG19E070003)。

摘　　要：5CrNiMoLaSr改性模具钢是一种极具应用前景的新型模具钢,研究了锻造态5CrNiMoLaSr改性模具钢的显微组织、室温及高温500℃下的力学性能和耐磨损性能,并与商用5CrNiMo模具钢进行了对比分析并简要探讨了其微观机制。结果表明:与商用5CrNiMo模具钢相比,锻造态5CrNiMoLaSr改性模具钢的组织更为细小、均匀;室温下的抗拉强度增大224 MPa、屈服强度增大207 MPa,500℃高温下的抗拉强度增大314 MPa、屈服强度增大285 MPa;室温和500℃高温下的伸长率均有较小幅度的增加;室温磨损体积减小1.1×10^(-2)mm^(3),500℃高温下磨损体积减小5.3×10^(-2)mm^(3)。稀土La以及稀土夹杂物对晶界具有阻碍作用,减少了杂质元素在晶界的偏聚,并促进了合金元素Sr在晶内的弥散分布。5CrNiMoLaSr modified die steel is a new type of die steel with great application prospects,and the microstructure,mechanical properties and wear resistance at room temperature and high temperature of 500℃for forged 5CrNiMoLaSr modified die steel were studied,and a comparative analysis was conducted with commercial 5CrNiMo die steel.Then,the micro mechanism was briefly discussed.The results show that compared with the commercial 5CrNiMo die steel,the microstructure of forged 5CrNiMoLaSr modified die steel is finer and more uniform.At room temperature,the tensile strength is increased by 224 MPa and the yield strength is increased by 207 MPa,and the tensile strength at high temperature of 500℃is increased by 314 MPa and the yield strength is increased by 285 MPa.At room temperature and high temperature of 500℃,the elongation is increased slightly,and the wear volumes are decreased by 1.1×10^(-2)and 5.3×10^(-2)mm^(3),respectively.Rare earth La and rare earth inclusions have a hindering effect on the grain boundaries,reducing the segregation of impurity elements at grain boundaries and promoting the dispersed distribution of alloy element Sr within the grains.

关 键 词：5CrNiMoLaSr改性模具钢 锻造 显微组织 力学性能 耐磨损性能 高温性能 

分 类 号：TH164[机械工程—机械制造及自动化]