航空科学技术2025，Vol.36Issue(2)：111-118,8.DOI:10.19452/j.issn1007-5453.2025.02.010
热等静压对激光熔覆涂层组织与性能的影响
Effect of Hot Isostatic Pressing on Microstructure and Properties of Laser Cladding Coatings
摘要
Abstract
In order to improve the surface properties of titanium alloy and meet the design requirements of high efficiency and stability,the microstructure and properties of laser cladding coating on titanium alloy surface were improved by hot isostatic pressing technique.The coating is remelted under the high temperature and pressure of hot isostatic pressing,and quickly cooled to room temperature by air cooling.The morphology,microstructure and element distribution of the coating were analyzed,and the microhardness of the coating section was measured.At the same time,the effect of hot isostatic pressing on the microstructure and properties of the coating was investigated.The results show that there are many cracks in the laser cladding layer prepared under the conditions of 1200W laser power and 20mm/s scanning speed,and the cracks are complex.Although the thickness of the laser cladding coating after hot isostatic pressing treatment is similar,the size of the wavy molten pool becomes larger,the combination of the coating and the matrix becomes relatively straight,and the number of cracks is effectively controlled.No defects such as collapse or holes were found,and the aluminum alloy layer in the outermost layer of the coating ceased to exist,forming TiAl or a new phase Ti5Al11.The main elements were consistent with the untreated cladding coating,but the distribution of elements in the micro-region changed to a certain extent due to high temperature and high pressure.The pressure promoted the diffusion of Al atoms towards the matrix,resulting in a decrease in the content of Al elements in the outer layer.The maximum surface hardness of the coated sample is 777.5HV0.2,which is at least 6.8%higher than that of the untreated coating.The microstructure and properties of the laser cladding coating are improved by hot isostatic pressing post-treatment,and the coating quality is greatly improved.关键词
钛合金/激光熔覆/涂层/热等静压/显微组织Key words
titanium alloy/laser cladding/coating/hot isostatic pressing/microstructure分类
矿业与冶金引用本文复制引用
徐伟,杜虎,李勇,王秋林..热等静压对激光熔覆涂层组织与性能的影响[J].航空科学技术,2025,36(2):111-118,8.基金项目
航空科学基金(2023Z053158001) Aeronautical Science Foundation of China(2023Z053158001) （2023Z053158001）
