摘要
激光抛光重熔层物化性质异于母材,其交界面不稳定,在复杂外界环境下将引发材料界面断裂与脱落,影响器件运行,威胁装备安全,如何缩减重熔层成为激光抛光领域亟待解决的关键问题。因此,提出了一种基于二次固溶缩减激光抛光重熔层的新方法,对比研究了固溶前后激光抛光钛合金表面形貌、微观组织、显微硬度、耐磨性能的变化,实现了重熔层微观组织向母材组织的转化、重熔层厚度的缩减以及显微硬度与耐磨性能的提升,阐明了二次固溶在重熔层显微组织转化过程中蕴含的深层物理机制。此外,原始钛合金面粗糙度(Sa=1.62μm)经激光抛光(Sa=243 nm)后降幅可达85%,而整个固溶过程不改变激光抛光表面粗糙度。
The physicochemical property of remelting layer with an instability interface by laser polishing was different from the basis metal,which affected device operation and even threatened equipment safety due to the fracture and detachment of material interfaces at complex external environments.It has been becoming a key problem about how to reduce the remelting layer in the field of laser polishing.It was proposed that a new method based on secondary solid solution to reduce laser polishing remelting layer.The change of surface appearance,microstructure,micro-hardness,and wear-resisting property of titanium alloy before and after laser polishing were studied.The transformation of the microstructure of the remelting layer to the base metal was realized,the thickness of the remelting layer was reduced,and the micro-hardness and wear resistance were improved.The deep physical mechanism of secondary solid solution in the microstructure transformation process of remelting layer was clarified.The 85%decrease of the surface roughness occurred from the original titanium alloy surface roughness Sa=1.62μm to Sa=243 nm after laser polishing.However,the subsequent secondary solid solution did not change the surface roughness of laser polishing.
作者
李庆
赵朕
刘文斌
王荣国
杨静
张浩
熊圣新
LI Qing;ZHAO Zhen;LIU Wenbin;WANG Rongguo;YANG Jing;ZHANG Hao;XIONG Shengxin(Jihua Laboratory,Foshan 528200,China;Tianjin Research Institute for Advanced Equipment,Tsinghua University,Tianjin 300300,China;CSIC Haizhuang Wind Power Co.,Ltd.,Chongqing 401120,China)
出处
《新技术新工艺》
2024年第9期16-20,共5页
New Technology & New Process
基金
国家海上风力发电工程技术研究中心开放基金项目(HSFD22006)。
关键词
钛合金
激光抛光
二次固溶
重熔层
titanium alloy
laser polishing
secondary solution treatment
remelting layer
作者简介
李庆(1989-),男,工程师,主要从事激光加工技术等方面的研究。
