摘要
通过选择合适的激光扫描速度,提高钛合金表面激光熔覆层的质量。在Nd:YAG激光器上采用不同的扫描速度进行熔覆实验,在Ti-6A1-4V合金表面预置Ti和B混合粉末,制备出原位自生的TiB金属陶瓷复合涂层,并对其进行XRD物相分析、显微组织观察及显微硬度分析。涂层主要是由Ti和TiB物相组成,钛合金基体呈现枝晶状或鱼骨状形貌,TiB以胞晶或颗粒状分布在呈枝晶状的Ti周围。随着扫描速度的增加,涂层的硬度也越来越高,但熔覆层深度降低。在不同扫描速度下,熔覆层均与基体呈现良好的冶金结合。存在着增强相的弥散强化作用,熔覆层的硬度得到提高。
The quality of the cladding layer on Ti alloy surface improves by selecting suitable laser scanning speed.The cladding experiments were carried out by using Nd∶YAG under different scanning speeds.Ti and B mixed powders were preset on the surface of Ti-6 Al-4 V alloy.In-situ TiB composite coatings were prepared.XRD analysis,SEM morphology observation and hardness analysis of the coatings were investigated.The coating is mainly composed of titanium and TiB phases.Ti alloy matrix is dendritic or fishbone morphology.TiB distributes around the dendritic Ti,which is white peritectic and particle shape.With the increase of scanning speed,the hardness of the coating becomes higher and higher;but the thickness of the cladding layer decreases.The cladding layers show a good metallurgical bonding with the substrate at different scanning speeds.With the increase of the laser scanning speed,there is a dispersion strengthening effect of the reinforcement phase,and the hardness of the laser cladding layer improves.
作者
林沛玲
张有凤
杨湾湾
王虎
孔海娟
陈学锋
LIN Peiling;ZHANG Youfeng;YANG Wanwan;WANG Hu;KONG Haijuan;CHEN Xuefeng(College of Material Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Key Laboratory of Inorganic Functional Materials and Devices of Chinese Academy of Sciences,Shanghai Institute of Silicate,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《热加工工艺》
北大核心
2019年第10期132-135,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(11604204,51603120)
中国科学院无机功能材料与器件重点实验室开放课题项目(KLIFMD-201601)
上海工程技术大学校级创新训练项目(cx1705003)
