TC4钛合金表面低压渗氮层的显微组织与耐磨性能
Microstructure and Wear Resistance of Low Pressure Nitrided Layer on TC4 Titanium Alloy Surface
摘 要
为了提高TC4钛合金的表面硬度及耐磨性, 对其进行了820 ℃×10 h的低压渗氮处理; 通过X射线衍射仪、光学显微镜、扫描电子显微镜、显微硬度计及磨损试验机研究了表面渗氮层的显微组织与耐磨性能。结果表明:渗氮处理后, 该钛合金表面形成了由表面氮化物层和次表面氮扩散层组成的渗氮层, 其物相组成为TiN、Ti2AlN和Ti3Al; 渗氮层的表面硬度为800~900 HV, 比基体的提高了近3倍, 截面硬度随着深度的增加而下降; 在相同条件下, 渗氮后试样的磨损质量损失比未经渗氮处理的小, 且随载荷的增加磨损质量损失增加更缓慢, 耐磨性得到了极大的改善。
低压渗氮
显微组织
耐磨性能
TC4 titanium alloy
low pressure nitriding
microstructure
wear resistance
Abstract
The low pressure nitriding treatment at 820 ℃ for 10 h was conducted on the surface of TC4 titanium alloy to improve its surface hardness and wear resistance, and then the microstructure and wear resistance of the surface nitrided layer were studied by X-ray diffraction, optical microscope, scanning electron microscope, microhardness tester and wear testing machine. The results show that after nitriding treatment, the nitrided layer consisted of surface nitride layer and subsurface nitrogen diffusion layer was formed on the surface of TC4 titanium alloy. The nitrided layer was mainly composed of TiN, Ti2AlN and Ti3Al. The surface hardness of the layer was 800-900 HV, which was 3 times as much as that of the substrate, and the sectional hardness decreased with the increase of depth. Under the same condition, the wear mass loss of the nitrided sample was lower than that before nitriding treatment and increased more slowly with the increase of load, showing the great improvement of wear resistance.
中图分类号 TG146.2 DOI 10.11973/jxgccl201606021
所属栏目 材料性能及其应用
基金项目 贵州省科技合作计划项目(黔科合LH字［2015］7765号); 国家自然科学基金资助项目(51574096), 贵州省科技计划项目(黔科合JZ字［2014］2003)
收稿日期 2015/2/21
修改稿日期 2016/4/12
网络出版日期
作者单位点击查看
备注杨闯(1976-), 男, 贵州思南人, 副教授, 博士。
引用该论文: YANG Chuang,LIU Jing,MA Ya-qin,HONG Liu,WANG Hua. Microstructure and Wear Resistance of Low Pressure Nitrided Layer on TC4 Titanium Alloy Surface[J]. Materials for mechancial engineering, 2016, 40(6): 98～101
杨闯,刘静,马亚芹,洪流,王华. TC4钛合金表面低压渗氮层的显微组织与耐磨性能[J]. 机械工程材料, 2016, 40(6): 98～101
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【5】ZENG L Y,YANG G J,PENG G,et al.Processing map of one kind of metastable β titanium alloy［J］.Rare Metal Materials and Engineering,2010,39(9):1505-1508.
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【10】郝建军,彭海滨,黄继华,等.钛合金表面反应电火花沉积TiN/Ti复合涂层［J］.焊接学报,2009,30(11):69-72.
【11】BHADURI D,CHATTOPADYAY A K.Study on the role of PVD TiN coating in improving the performance of electroplated monolayer superabrasive wheel［J］.Surface and Coatings Technology,2010,205(2):658-667.
【12】陈勇国,张东明,刘晶,等.钛合金基体上TiN涂层的残余热应力分析［J］.人工晶体学报,2009,38(1):251-254.
【13】李欣,任振安,孙大千,等.Ti6Al4V基体上氮电弧熔化法制备TiN层的组织及性能［J］.吉林大学学报(工学版),2010,40(4):995-999.
【14】THONGTEM S,THONGTEM T,MCNALLAN M.High temperature nitridation and oxidation of Ti based alloys［J］.Surface and Interface Analysis,2001,32(1):306-309.
【15】赵斌,吴建生,孙坚,等.TiAl基合金高温气体渗氮［J］.金属学报,2001,37(8):837-840.
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