摘要
采用真空烧结工艺制备M2高速钢,研究真空度与碳含量对高速钢组织和拉伸性能的影响。结果表明:低真空度下(10^−1 Pa)M2高速钢的有效烧结温度为1220~1230℃,在该区间内烧结相对密度可达96%以上,烧结体显微组织由奥氏体基体及M6C、MC碳化物组成;超过该温度区间进行烧结会使合金析出有害的共晶碳化物,导致高速钢强度显著下降。当真空度提高到10^−3 Pa时,M2高速钢的烧结温度降低,显微组织中的碳化物更细小、分布更均匀。M2高速钢的相对密度为98%,拉伸强度为989 MPa,伸长率为7.1%。随碳含量升高,M2高速钢的烧结区间无明显变化,但在较低温度下烧结更容易实现致密化。当碳的质量分数为1.0%时,样品的相对密度为97%,拉伸强度为954 MPa,伸长率为7%。
The M2 high speed steel was prepared by vacuum sintering process.The effects of vacuum and carbon content on microstructure and properties of M2 high speed steel were studied.The results show that the effective sintering temperature of M2 HSS under low vacuum(10^−1 Pa)is 1220−1230℃,and its relative density is above 96%.The microstructure of M2 is composed of austenitic matrix,M6C and MC carbides after sintering.When vacuum degree increases to 10^−3 Pa,the effective sintering temperature of M2 HSS decreases,and the carbides in the matrix are finer and more evenly distributed.The relative density of the sintered sample is 98%,and its tensile properties and elongation reached 989 MPa and 7.1%,respectively.With the increase of carbon content,there is no obvious change in sintering interval of M2 high-speed steel,but the densification can be easier to achieve at lower temperature.When the mass fraction of carbon is 1.0%,the relative density of the sample is 97%,its tensile strength and elongation are 954 MPa and 7%,respectively.
作者
刘瑞卿
何浩
娄嘉
李益民
李松
刘晨
秦健春
LIU Ruiqing;HE Hao;LOU Jia;LI Yimin;LI Song;LIU Chen;QIN Jianchun(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Materials Science and Engineering Research Center,Guangxi University of Science and technology,Liuzhou 545006,China;School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2019年第6期508-514,共7页
Materials Science and Engineering of Powder Metallurgy
基金
湖南省科技计划(2017GK2264)
2019年广西高校中青年教师科研基础能力提升项目(2019KY0381)
柳州市科技计划(2018DH10505)
关键词
粉末冶金
高速钢
真空度
碳含量
力学性能
powder metallurgy
high speed steel
vacuum degree
carbon content
mechanical properties
作者简介
通信作者:李松,副教授,博士。电话:0731-88830911,E-mail:ls2011sl@csu.edu.cn。
