550 ℃表面渗氧对Ti-6Al-4V合金耐磨性能的影响

doi:10.13251/j.issn.0254-6051.2021.01.024

金属热处理 ›› 2021, Vol. 46 ›› Issue (1): 125-132.DOI: 10.13251/j.issn.0254-6051.2021.01.024

550 ℃表面渗氧对Ti-6Al-4V合金耐磨性能的影响

杨杰^1,2, 张青科², 李琼³, 宋振纶², 吴晓春¹

1.上海大学材料科学与工程学院,上海 200072;
2.中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室,浙江省海洋材料与防护技术重点实验室,浙江宁波 315201;
3.美敦力公司,美国明尼阿波利斯 55432;
4.中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳 110016;
5.中国科学技术大学材料科学与工程学院,辽宁沈阳 110016

收稿日期:2020-04-08 出版日期:2021-01-25 发布日期:2021-01-26
通讯作者: 张青科,副研究员,博士,E-mail:zhangqingke@nimte.ac.cn
作者简介:杨杰(1996—),男,硕士研究生,主要研究方向为钛合金表面防护技术,E-mail:yjie@nimte.ac.cn.

Effect of surface oxidizing at 550 ℃ on wear resistance of Ti-6Al-4V alloy

Yang Jie^1,2, Zhang Qingke², Li Qiong³, Song Zhenlun², Wu Xiaochun¹

1. School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;
2. Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo Zhejiang 315201,China;
3. Medtronic Inc,Minneapolis 55432,USA;
4. Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016,China;
5. School of Materials Science and Engineering,University of Science and Technology of China,Shenyang Liaoning 110016,China

Received:2020-04-08 Online:2021-01-25 Published:2021-01-26

摘要/Abstract

摘要： 对Ti-6Al-4V合金550 ℃的空气中渗氧60 h后的表面形貌、显微组织、成分、硬度、划刻性能和耐磨性进行研究,并与未处理的钛合金进行了比较。结果表明,渗氧后的钛合金表面粗糙度有所增加,表层形成约3.5 μm厚的渗氧层,X射线衍射(XRD)检测到了锐钛矿相、金红石相、板钛矿相TiO₂和Al₂O₃相。渗氧层的显微硬度和纳米硬度分别为804.6 HV0.025和14.5 GPa,比未处理的基体提高了143.7%,且压痕周围未见裂纹;渗氧后钛合金表面最大划痕深度由12 μm降至4 μm,磨损率由354.33×10^-6mm³/Nm降至1.44×10^-6mm³/Nm,渗氧层的主要磨损机制为轻微的磨粒磨损。表面渗氧显著提高了Ti-6Al-4V钛合金表面硬度和耐磨性,同时其内部组织粗化和软化不明显,可作为提高钛合金表面耐磨性能的潜在方法。

关键词: 表面渗氧, 钛合金, 渗氧层, 硬度, 耐磨性

Abstract: Thermal oxidation (TO) of Ti-6Al-4V alloy was performed at 550 ℃ for 60 h in air,and the surface morphology,microstructure,composition,hardness,scratch performance and wear resistance of the TO treated and untreated alloy were evaluated and compared.The results reveal that the surface roughness of the Ti alloy increases a little after TO,an oxygen-diffusion layer of about 3.5 μm thickness is formed on the surface,and anatase,rutile,brookite TiO₂ and Al₂O₃ phases are detected by X-ray diffraction (XRD).The microhardness and nano hardness of the oxygen-diffusion layer are 804.6 HV0.025 and 14.5 GPa,respectively,which is 143.7% higher than that of the untreated substrate,and no cracking is observed around the indentations.The maximum scratch depth is significantly reduced from 12 μm to 4 μm after TO,and the wear rate decreases from 354.33×10^-6 mm³/Nm to 1.44×10^-6 mm³/Nm,and the main wear mechanism of the oxygen-diffusion layer is slight abrasive wear.It is concluded that the surface TO treatment considerably increases the surface hardness and wear resistance of the Ti-6Al-4V alloy,but leads no obvious inner microstructure coarsening and softening,thus could be a potential method to improve the surface wear resistance of Ti alloys.

Key words: surface oxidizing, titanium alloy, oxygen-diffusion layer, hardness, wear resistance

中图分类号:

TG166.5

杨杰, 张青科, 李琼, 宋振纶, 吴晓春. 550 ℃表面渗氧对Ti-6Al-4V合金耐磨性能的影响[J]. 金属热处理, 2021, 46(1): 125-132.

Yang Jie, Zhang Qingke, Li Qiong, Song Zhenlun, Wu Xiaochun. Effect of surface oxidizing at 550 ℃ on wear resistance of Ti-6Al-4V alloy[J]. Heat Treatment of Metals, 2021, 46(1): 125-132.

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550 ℃表面渗氧对Ti-6Al-4V合金耐磨性能的影响

Effect of surface oxidizing at 550 ℃ on wear resistance of Ti-6Al-4V alloy

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