不同压力对TC4钛合金真空脉冲渗氮的影响

发布时间：2018-01-15 21:33

本文关键词：不同压力对TC4钛合金真空脉冲渗氮的影响　出处：《表面技术》2015年08期 　论文类型：期刊论文

【摘要】：目的采用不同压力对TC4钛合金进行真空脉冲渗氮处理,提高其表面硬度及耐磨性。方法通过金相显微镜、X射线衍射仪、显微硬度计及耐磨试验机分析渗氮硬化层的组织与性能。结果 TC4钛合金经过真空气体渗氮处理后,形成了由Ti N,Ti2Al N和钛铝金属间化合物Ti3Al组成的复合改性层。渗氮压力太低,表面氮化物数量较少,氮化物层较薄;随渗氮压力的增大,表面氮化物数量增多,表面硬度及耐磨性增加。压力为0.015 MPa时,氮化物层表面硬度最大,表面硬度为1100~1200HV,有效硬化层深度为50~60μm。渗氮压力继续增加,表层组织变得疏松,表面硬度及耐磨性开始降低。结论选择合适的渗氮压力和表面氮浓度进行真空脉冲渗氮,可以提高钛合金表面硬度,改善耐磨性。
[Abstract]:Objective to improve the surface hardness and wear resistance of TC4 titanium alloy by vacuum pulse nitriding under different pressures. Microstructure and properties of nitriding and hardening layer were analyzed by microhardness tester and wear tester. Results TC4 titanium alloy was formed by nitriding by vacuum gas nitriding. The compound modified layer composed of Ti2Al N and titanium-aluminum intermetallic compound Ti3Al. The nitriding pressure is too low, the amount of nitride on the surface is less, and the nitride layer is thin. With the increase of nitriding pressure, the amount of nitride on the surface increases, and the surface hardness and wear resistance increase. When the pressure is 0.015 MPa, the surface hardness of the nitride layer is the highest. The surface hardness is 1100m ~ 1200HVand the effective hardening depth is 50 ~ 60 渭 m. The nitriding pressure continues to increase and the surface structure becomes loose. Conclusion selecting proper nitriding pressure and surface nitrogen concentration for vacuum pulse nitriding can improve the surface hardness and wear resistance of titanium alloy.
【作者单位】：贵州师范大学材料与建筑工程学院;
【基金】：贵州省教育厅重点实验室建设项目(KY2012004号) 贵州师范大学2014年博士科研启动项目~~
【分类号】：TG156.82
【正文快照】： Received:2015-04-12;Revised:2015-05-05Fund:Guizhou Department of Education Key Laboratory Construction Project(KY2012004)and Supported by Guizhou Normal University Doctor StartupFoundation in 2014钛合金作为新兴的结构材料,密度小,比强度高,耐腐蚀及生物相容

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