氮含量对电热合金Cr20Ni80组织和力学性能的影响  

Effects of Nitrogen Content on Microstructure and Mechanical Property of Cr20Ni80 Electrothermal Alloy

作　　者：彭勇[1] 周海涛[1] 邵兴明 刘克明[1,3] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]江苏新华合金电器有限公司,江苏泰州225300 [3]江西省科学院江西省铜钨新材料重点实验室,江西南昌330029

出　　处：《热加工工艺》2012年第22期52-54,58,共4页Hot Working Technology

基　　金：江苏省科技计划面上项目(SBE201000527)

摘　　要：采用光学显微镜、扫描电镜、维氏硬度计、拉伸试验机和电子探针分析仪(EPMA)等仪器研究了不同氮含量对Cr20Ni80电热合金组织和力学性能的影响。结果表明:合金显微组织中存在一些非金属夹杂物,主要为氮化物。随着氮含量增加,夹杂物的析出开始增多,且晶粒尺寸得到细化;合金的硬度和抗拉强度都随氮含量的上升先增加后减少;当氮含量为0.0331%时,室温力学性能最佳,硬度和抗拉强度达到最大值,分别为224.9 HV和868.6 MPa。The effects of nitrogen content on the microstructure and mechanical property of Cr20Ni80 electrothermal alloy were studied by OM, SEM, vickers hardmeter, tensile testing machine and electron probe micro-analyzer （EPMA）. The results show that some non-metallic inclusions can be found in the microstructure, which are mainly nitrides; with the increase of nitrogen content, the grain size can be refined at some degree. The inclusions also begin increasing, the hardness and tensile strength both first increase and then decrease; when the nitrogen content is 0.0331%, the mechanical properties at room temperature are best, the hardness and tensile strength reach the maximum, which is 224.9 HV and 868.6 MPa, respectively.

关 键 词：Cr20Ni80电热合金 氮含量 显微组织 力学性能 

分 类 号：TG144[一般工业技术—材料科学与工程]