陆莹,李松夏,乔红超,曲楠,赵吉宾,胡太友.TiAl合金激光冲击强化表面微观形貌演变分析[J].稀有金属材料与工程,2019,47(3):841~846.[LuYing,Lisongxia,Qiao hongchao,Qunan,Zhaojibin,hutaiyou.The surface microstructure evolution analysis of TiAl alloy by laser shock peening[J].Rare Metal Materials and Engineering,2019,47(3):841~846.]
TiAl合金激光冲击强化表面微观形貌演变分析
投稿时间:2017-08-17  修订日期:2018-03-21
中文关键词:  TiAl合金  激光冲击强化  凸起  微观组织  塑性变形
基金项目:辽宁省自然科学基金资助(项目号2015020115);国家重点研发计划资助(项目号2016YFB1102704)
中文摘要:
      本文针对TiAl合金进行激光冲击强化,研究多晶体在强化过程中表面微观形貌演变,发现经过单点激光冲击的试样表面形成的凹坑中存在一些分布不均匀的凸起结构,凸起结构相对高度范围为100nm~300 nm,凸起边缘为环状凸台;研究不同能量密度对表面凸起结构的影响,发现凸起结构的数量明显增加,凸起相对高度有增加的趋势,同时凹坑中心平均表面粗糙度明显增加;研究搭接率为50%的多次冲击形貌变化,发现相比于单次冲击,多次冲击凸起数量明显减少,表面粗糙度略有增加,这是因为随着冲击次数增加弹性变形和塑性变形趋于一种饱和状态,弹性变形部分发生回弹。分析表面凸起结构形成机制,建立不均匀塑性变形流模型和冲击波叠加模型,激光冲击强化形成的表面形貌是两种模型相互耦合作用的结果。
The surface microstructure evolution analysis of TiAl alloy by laser shock peening
英文关键词:TiAl  alloy, laser  shock processing, protrusions, microstructure, plastic  deformation
英文摘要:
      The evolution of surface microstructure of the poly crystals formed in TiAl alloy which is treated by laser shock processing is studied in this paper. After a single laser shock peening treated, there are some uneven distributed briefs in the pits formed on the surface of the sample was found, the relative height of briefs ranges from 100 nm to 300 nm and the raised edge is an annular boss. When the samples are treated with different energy density lasers, research on the protrusions showed that the numbers increased significantly and the relative height have an increasing tendency, and the average surface roughness of the pits increased obviously. Further study on the changes in shape of multiple impacts with the spot overlap rate of 50% reveals that the number of briefs significantly reduced compared with a single laser shock processing treatment, and the surface roughness is slightly increased. This is because the elastic deformation and plastic deformation tends to be saturated with the increase in the number of laser shock processing treatment, and the elastic deformation part gets rebound. The formation mechanism of the surface protrusions is analyzed, and the uneven plastic deformation flow model and shock wave superposition model are established. The surface topography formed by laser shock processing is the result of the coupling effect of the two models.
作者单位E-mail
陆莹 中国科学院沈阳自动化研究所 luying@sia.cn 
李松夏 中国科学院沈阳自动化研究所  
乔红超 中国科学院沈阳自动化研究所  
曲楠 中航工业沈阳飞机制造有限公司  
赵吉宾 中国科学院沈阳自动化研究所  
胡太友 中国科学院沈阳自动化研究所  
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