铬含量对碳化钛-高锰钢钢结硬质合金组织与性能的影响  

Effect of Chromium Content on Microstructure and Properties of High Manganese Steel-bonded TiC Carbide

作　　者：纪振晖 李国平[2,3] 罗丰华 郝俊杰 颜练武 Ji Zhenhui;Li Guoping;Luo Fenghua;Hao Junjie;Yan Lianwu(Institute of Advanced Materials and Technology,Beijing Science and Technology University,Beijing 100083,China;Powder Metallurgy Research Institute,Central South University,Changsha Hunan 410083,China;Laiwu Vocational and Technical College,Jinan Shandong 271100,China;College of Metallurgy and Material Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]中南大学粉末冶金研究院,湖南长沙410083 [3]莱芜职业技术学院,山东济南271100 [4]湖南工业大学冶金与材料工程学院,湖南株洲412007

出　　处：《硬质合金》2019年第3期235-240,共6页Cemented Carbides

基　　金：2016年山东省科技发展计划项目(No:2016GGX102044);2018年莱芜高新区科技发展计划项目

摘　　要：采用传统的粉末冶金工艺制备了不同铬含量的碳化钛-高锰钢结硬质合金,铬含量分别为0.5%、1.0%、1.5%、2.0%、2.5%和0,研究了铬含量对合金组织与性能的影响.用扫描电子显微镜对合金的组织进行了观察.结果表明,随着铬含量的增加,合金中碳化钛颗粒的尺寸逐渐增大;当铬含量2.5%时,碳化钛颗粒尺寸显著增大.合金的硬度随着铬含量的增加先升高后降低,当铬含量为2.0%时,合金硬度达到最大值HRC64.9,其后硬度稍微降低.随着铬含量的增加,合金的抗弯强度(TRS)和冲击韧性(IM)均先升高后降低.铬含量达到2.0%时,抗弯强度达到最大值2307MPa;铬含量为1.5%时,冲击韧性达到最大值12.89J/cm^2.因此,适量的铬可以显著提高合金的力学性能.High manganese steel-bonded TiC carbides were fabricated with various chromium contents(0.5,1.0,1.5,2.0,2.5 and 0,respectively,mass fraction,%)by conventional powder metallurgy techniques,and effects of chromium contents on microstructure and properties of the alloys were researched.Microstructures of the alloys were investigated by scanning electron microscope(SEM).Results show that the particle size of TiC increases slightly with the increase of chromium content.However,it increases significantly when chromium content is 2.5%.Hardness of the alloy increases with the increase of chromium content firstly and then decreases,and reaches maximal value of HRC64.9 with chromium content of 2.0%.Subsequently,the hardness decreases slightly.Transverse rupture strength(TRS)and impact toughness(IM)of the alloy increase firstly and then decrease with the increase of chromium content.The TRS reaches maximal value of 2 307 MPa when chromium content is 2.0%,while impact toughness reaches maximal value of 12.89 J/cm2 when chromium content is 1.5%.So mechanical properties of the alloy can be improved significantly with appropriate chromium additive.

关 键 词：碳化钛 钢结硬质合金 铬含量 组织 性能 

分 类 号：TF125.3[冶金工程—粉末冶金]