真空渗氮时间对TC4钛合金渗氮层组织与性能的影响  

Influence of vacuum nitriding time on microstructure and properties of nitriding layer of TC4 titanium alloy

作　　者：周军[1] 杨闯[1] 马亚芹[1] 刘静[1] Zhou Jun;Yang Chuang;Ma Yaqin;Liu Jing(School of Materials and Architecture Engineering,Guizhou Normal University,Guiyang Guizhou 550025,China)

机构地区：[1]贵州师范大学材料与建筑工程学院

出　　处：《金属热处理》2018年第9期80-84,共5页Heat Treatment of Metals

基　　金：贵州省科技合作计划项目(黔科合LH字[2015]7765号);国家自然科学基金(51574096)

摘　　要：采用不同时间对TC4钛合金进行真空渗氮处理。通过金相分析、X射线衍射（XRD）、显微硬度测试和耐磨试验研究了渗氮时间对渗氮层组织与性能的影响。结果表明：经820℃不同时间真空渗氮后,TC4钛合金表面物相主要以Ti N和Ti2Al N为主,渗氮初期,氮化物层厚度增加较快,随时间延长,氮化物层厚度增加速度逐渐减小,渗氮层深度与时间符合遵循抛物线规律。表面硬度及耐磨性随时间延长而增加,当渗氮时间达到10 h以后,表面硬度及耐磨性随时间延长基本保持不变,氮化物层厚度随时间延长继续增加。TC4 titanium alloy was vacuum nitrided at different time. Influence of vacuum nitriding time on microstructure and properties was studied by means of metallographic analysis,XRD,microhardness and abrasion test. The results show that phases of TC4 titanium alloy nitrided at 820 ℃ for different time are mainly Ti N and Ti2 Al N. The thickness of the nitride layer increases faster in the early stage and the thickening rate slows down with the increase of nitriding time. The relations between nitriding layer depth and nitriding time follow parabola law. Microhardness and wear resistance will increase with nitriding duration,and the surface hardness will maintain stability after nitriding10 h,but the thickness and wear resistance of the nitrided layer will continue to increase with the increase of the nitriding time.

关 键 词：TC4钛合金 真空渗氮时间 组织 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]