等离子表面渗Nb对γ-TiAl合金扩散焊接性能的影响

doi:10.13251/j.issn.0254-6051.2022.02.038

金属热处理 ›› 2022, Vol. 47 ›› Issue (2): 213-218.DOI: 10.13251/j.issn.0254-6051.2022.02.038

等离子表面渗Nb对γ-TiAl合金扩散焊接性能的影响

孙定邦, 王永胜, 高洁, 贺志勇, 吴艳霞, 周兵, 马永, 于盛旺

太原理工大学材料科学与工程学院, 山西太原 030024

收稿日期:2021-10-19 修回日期:2021-12-24 出版日期:2022-02-25 发布日期:2022-04-01
通讯作者: 贺志勇,教授,E-mail:hezhiyong@tyut.edu.cn
作者简介:孙定邦 (1995—),男,硕士研究生,主要研究方向为金属材料及其表面改性,E-mail:sdb3037198@163.com。
基金资助:
国家自然科学基金(51601122);新金属材料国家重点实验室基金(2019-ZD02);山西省科技重大专项(20181102013);山西省“1331工程”工程研究中心(PT201801);国家自然科学基金青年项目(51901154);山西省应用基础研究计划面上青年基金项目(201901D211092)

Effect of plasma surface metallizing Nb on diffusion welding performance of γ-TiAl alloy

Sun Dingbang, Wang Yongsheng, Gao Jie, He Zhiyong, Wu Yanxia, Zhou Bing, Ma Yong, Yu Shengwang

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China

Received:2021-10-19 Revised:2021-12-24 Online:2022-02-25 Published:2022-04-01

摘要/Abstract

摘要： 采用双辉等离子表面渗金属技术在名义成分为Ti-45Al-8.5Nb (W, B, Y) 的γ-TiAl合金表面制备了Nb涂层。使用SEM、EDS、XRD等手段研究了不同渗Nb温度、焊接温度对γ-TiAl合金扩散焊接接头微观组织及性能的影响。结果表明,在800～950 ℃的渗Nb温度范围内均可以在γ-TiAl合金表面形成致密的Nb涂层,随着渗Nb温度的升高,Nb涂层晶粒尺寸和表面粗糙度均不断增大。典型的接头组织从基体向焊缝中心可分为4层:I层(Nb涂层与基体间扩散层)、II层(含有少量AlNb₂的Ti-Nb互溶层)、III层(富Ti-TiNi层)、IV层(近等原子比TiNi层)。接头的剪切强度随渗Nb温度和焊接温度的升高均呈先增大后减小的趋势。渗Nb温度为850 ℃,焊接温度为900 ℃时获得的接头剪切强度最高,达到82.0 MPa。

关键词: TiAl合金, 双辉等离子渗金属技术, Nb涂层, 扩散焊接

Abstract: Double glow plasma metallizing technology was used to prepare Nb coating on the surface of γ-TiAl alloy with a nominal composition of Ti-45Al-8.5Nb (W, B, Y). Effect of Nb depositing temperature and welding temperature on microstructure and properties of the γ-TiAl alloy diffusion welded joints was studied by SEM, EDS, XRD, etc. The results show that dense Nb coating can be formed on the γ-TiAl alloy at the Nb depositing temperature range of 800-950 ℃. The grain size and roughness of the Nb coating increase continuously with the increase of Nb depositing temperature. The typical joint structure from the substrate to welded center can be divided into 4 layers: layer I (diffusion layer between substrate and Nb coating), layer II (Ti-Nb miscible layer containing small amount of AlNb₂), layer III (Ti-riched TiNi layer), layer IV (near equiatomic TiNi layer). The shear strength of the joint increases first and then decreases with the increase of Nb depositing temperature and welding temperature. The joint prepared at Nb depositing temperature of 850 ℃ and diffusion welding temperature of 900 ℃ achieves the highest shear strength, up to 82.0 MPa.

Key words: TiAl alloy, double glow plasma metallizing technology, Nb coating, diffusion welding

中图分类号:

TG441.3

孙定邦, 王永胜, 高洁, 贺志勇, 吴艳霞, 周兵, 马永, 于盛旺. 等离子表面渗Nb对γ-TiAl合金扩散焊接性能的影响[J]. 金属热处理, 2022, 47(2): 213-218.

Sun Dingbang, Wang Yongsheng, Gao Jie, He Zhiyong, Wu Yanxia, Zhou Bing, Ma Yong, Yu Shengwang. Effect of plasma surface metallizing Nb on diffusion welding performance of γ-TiAl alloy[J]. Heat Treatment of Metals, 2022, 47(2): 213-218.

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等离子表面渗Nb对γ-TiAl合金扩散焊接性能的影响

Effect of plasma surface metallizing Nb on diffusion welding performance of γ-TiAl alloy

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