前置渗氧对<strong>TC4</strong>钛合金低温等离子复合渗层微观结构和耐磨损性能的影响

doi:10.11900/0412.1961.2021.00437

金属学报

2023, Vol. 59

Issue (10): 1355-1364 DOI: 10.11900/0412.1961.2021.00437

研究论文

本期目录 | 过刊浏览

前置渗氧对TC4钛合金低温等离子复合渗层微观结构和耐磨损性能的影响

王海峰¹^,², 张志明¹, 牛云松²(

), 杨延格²(

), 董志宏², 朱圣龙², 于良民¹, 王福会³

^1.中国海洋大学深海圈层与地球系统前沿科学中心和海洋化学理论与工程技术教育部重点实验室青岛 266100
^2.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
^3.东北大学沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819

Effect of Pre-Oxidation on Microstructure and Wear Resistance of Titanium Alloy by Low Temperature Plasma Oxynitriding

WANG Haifeng¹^,², ZHANG Zhiming¹, NIU Yunsong²(

), YANG Yange²(

), DONG Zhihong², ZHU Shenglong², YU Liangmin¹, WANG Fuhui³

^1.Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Shenyang National Key Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

引用本文:

王海峰, 张志明, 牛云松, 杨延格, 董志宏, 朱圣龙, 于良民, 王福会. 前置渗氧对TC4钛合金低温等离子复合渗层微观结构和耐磨损性能的影响[J]. 金属学报, 2023, 59(10): 1355-1364.
Haifeng WANG, Zhiming ZHANG, Yunsong NIU, Yange YANG, Zhihong DONG, Shenglong ZHU, Liangmin YU, Fuhui WANG. Effect of Pre-Oxidation on Microstructure and Wear Resistance of Titanium Alloy by Low Temperature Plasma Oxynitriding[J]. Acta Metall Sin, 2023, 59(10): 1355-1364.

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摘要:

针对钛合金硬度低、耐磨性差的缺点，提出了一种由渗氧和氧氮共渗两个过程组成的低温等离子复合渗工艺，并着重研究了前置渗氧对钛合金表面微观结构、物相组成及耐磨性能的影响。利用SEM、TEM、XRD等手段对复合渗层的微观结构和相组成进行了分析，结果表明，等离子复合渗处理的钛合金样品渗层主要由化合物层和扩散层组成，物相为金红石型TiO₂和氮化物TiN_0.26。采用显微硬度计、纳米压痕仪和往复式摩擦试验机对渗层的显微硬度和摩擦磨损性能进行了表征，结果表明，与传统等离子渗氮相比，等离子复合渗处理可增加渗层的厚度，显著提高钛合金的硬度和弹性模量，大幅改善钛合金的耐磨损性能。

关键词 ：钛合金, 等离子渗氮, 硬度, 等离子渗氧, 耐磨

Abstract：

Titanium alloys are used in the aerospace industries, chemical industries, biomedicine, marine ships and other fields because of their high strength-to-weight ratio, good corrosion resistance, and biocompatibility. However, titanium alloys have low hardness and poor wear resistance, which limit their applications, especially under sliding contact. Plasma nitriding (PN) is an effective method for improving titanium alloy's tribological properties. PN can produce a composite layer composed of TiN and Ti₂N to improve the friction and wear properties of titanium alloy. However, the high temperature in the nitriding treatment results in a brittle “α-stabilized layer” (a continuous layer of α phase titanium enriched with interstitial nitrogen atoms) and unfavorable phase transformations in the substrate that can impair the fracture toughness, ductility, and fatigue properties. In this study, a low-temperature plasma-composite treatment, consisting of plasma oxidizing and oxynitriding, has been developed to improve the hardness and wear resistance of Ti-6Al-4V alloy. The effect of the preoxidation process on the surface microstructure, phase composition, and wear performance of titanium alloy was studied. The microstructure and phase composition of the plasma-composite layer were observed using SEM, TEM, XRD, and other methods. The results showed that the composite layer of titanium alloy treated using plasma-composite-treatment is composed of compound and diffusion layers, and the phase is TiO₂ (rutile) and TiN_0.26. Microhardness and wear-resistance properties of the composite layer were characterized using microhardness tester, nanoindentation, and reciprocating-friction tester. The plasma-composite treatment can increase infiltration depth of the diffusion layer, surface hardness, elastic modulus, and wear resistance of the titanium alloy more than the traditional nitriding process.

Key words： titanium alloy plasma nitriding hardness plasma oxidizing wear resistance

收稿日期: 2021-10-15

ZTFLH:

TG174.4

基金资助:国家重点研发计划项目(2019YFC0312100);国家自然科学基金项目(51701223);民机专项项目(MJ-2017-J-99)

通讯作者: 牛云松，ysniu@imr.ac.cn，主要从事金属表面改性方面的研究；
杨延格，ygyang@imr.ac.cn，主要从事金属材料腐蚀与防护的研究

Corresponding author: NIU Yunsong, senior engineer, Tel: (024)23992860, E-mail: ysniu@imr.ac.cn;
YANG Yange, associate professor, Tel: (024)23881473, E-mail: ygyang@imr.ac.cn

作者简介: 王海峰，男，1995年生，硕士

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	王福会
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表1 3种制备工艺的具体参数

图1 铸锻TC4钛合金的显微组织

图2 不同工艺下渗层的截面形貌

图3 不同工艺下渗层的XRD谱

图4 PO+PN 4h样品的截面显微结构及不同区域的选区电子衍射花样

图5 纳米压痕测试中硬度和弹性模量随深度的变化曲线

表2 钛合金基体和热处理样品的相关力学性能

图6 不同等离子热处理工艺下渗层的显微硬度分布

图7 不同等离子热处理工艺下渗层的摩擦系数-时间曲线

图8 不同工艺下渗层和对应磨球的磨损率

图9 不同工艺下渗层磨痕的三维形貌及截面轮廓图

图10 不同工艺渗层的磨痕形貌

图11 图10a~c中部分区域的放大图以及EDS分析

图12 摩擦实验后不同工艺样品对应的磨球表面形貌

图13 2种不同渗层的磨损机理示意图

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