钛合金表面激光熔覆Ti-Al的涂层组织和性能研究
Study on Microstructure and Properties of Laser Cladding Ti-Al Coating on Titanium Alloy Surface
李勇 1刘春华 2王秋林 1王君 1张宏3
作者信息
- 1. 成都航空职业技术学院,四川成都 610100
- 2. 中国空气动力研究与发展中心设备设计与测试技术研究所,四川绵阳 621000
- 3. 四川大学建筑与环境学院破坏力学与工程防灾减灾四川省重点实验室,四川成都 610065
- 折叠
摘要
利用激光熔覆技术,采取氩气保护、同轴送粉的方式,在钛合金表面制备出不同激光功率和不同扫描速度的Ti-Al复合涂层,熔覆材料选用AlSi10铝合金粉末.利用SEM、XRD和EDS对复合涂层的组织和性能进行分析.结果显示,Ti-Al涂层主要元素为Ti、Al、Si和V,Ti元素和Al元素的原子比随着涂层位置的不同发生变化;涂层由多种Ti-Al金属间化合物和单质金属构成,主要的金属间化合物有Ti0.66 Al3 Vo.33、Ti7 Al5Si12、TiAl3、TiAl2等几种.Ti-Al涂层表面硬度由基体向外逐渐增大,在涂层结合处达到峰值后呈下降趋势,涂层结合处最大表面硬度为788.3 HV,近似为基体的1.8倍.其中激光功率1 200 W、扫描速度为15 mm/s时制备的涂层性能较好,结合处的孔洞、裂纹等缺陷最少.
Abstract
Ti-Al composite coatings were fabricated on titanium alloy surfaces using laser cladding technology with a coaxial ar-gon gas protection feeding mode.AlSi10 aluminum alloy powder served as the cladding material.The microstructure and prop-erties of the composite coating were analyzed by SEM,XRD and EDS.Analysis revealed that the Ti-Al coatings are primarily composed of Ti,Al,Si,and V,with the atomic ratio of Ti to Al varying across different coating regions.The coating is com-posed of a variety of Ti-Al intermetallic compounds and elemental metals,the main intermetallic compounds are Ti0.6 Al3 V0.33,Ti7 Al5Si12,TiAl3,TiAl2 and so on.The surface hardness of Ti-Al coating increases gradually from the substrate to the out-side,and shows a decreasing trend after reaching the peak value at the joint of the coating.The maximum surface hardness at the joint of the coating is 788.3 HV,which is approximately 1.8 times of the matrix.When the laser power was 1 200 W and the scanning speed was 15 mm/s,the coating performance was better and the defects such as holes and cracks were the least.
关键词
钛合金/激光熔覆/涂层/金属间化合物Key words
titanium alloy/laser cladding/coating/intermetallic compound引用本文复制引用
出版年
2024
NETL
NSTL
万方数据