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Ti834合金激光冲击强化层显微组织及性能研究
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1.太原理工大学;2.西北有色金属研究院

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基金项目:

国家重点研发计划项目(项目号2016YFB0301201),国家自然科学基金资助(项目号51601149)


Effects of laser shock processing on microstructure and mechanical properties of Ti834 alloy
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1.Research Center of Advanced Materials Science and Technology of Taiyuan University of Technology;2.Northwest Institute for Non-ferrous Metal Research

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    摘要:

    激光冲击强化(Laser shock processing 简称LSP)又称激光喷丸,是一项新的表面强化处理技术。本文采用表面粗糙度仪、X射线衍射仪、显微硬度计分析了激光冲击前后Ti834合金的表面粗糙度、残余应力及显微硬度分布规律,并采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对冲击区域表面形貌及显微组织进行了表征。试验结果表明,Ti834钛合金经激光冲击处理后表面粗糙度、显微硬度和残余压应力均随激光冲击次数的增加而增大。经一次冲击和两次冲击后形成的强化层深度分别为170μm和265μm。由冲击波诱导形成的塑性变形层内可观察到大量位错缠结现象,LSP后位错密度的增加以及形变孪晶的出现有利于提升Ti834合金的机械性能。

    Abstract:

    Laser shock processing (LSP), also known as laser shot peening, is a novel surface strengthening treatment technology. In this paper, the surface roughness, residual stress and microhardness distribution of Ti834 alloy before and after LSP were analyzed by means of surface roughometer, X-ray diffraction and microhardness tester. And the surface morphology and microstructure of the impact area were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). The experimental results show that the surface roughness, microhardness and residual compressive stress of Ti834 titanium alloy increase after LSP. Moreover, the depth of the strengthening layer formed after one impact and two impacts was 170 μm and 265 μm, respectively. A large number of dislocation entanglement can be observed in the plastic deformation layer induced by laser shock wave. The increase of dislocation density and the formation of deformation twins are conducive to improvement of mechanical properties of Ti834 alloy subjected to LSP.

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昝垚旭,贾蔚菊,赵恒章,毛小南,樊建锋,周廉. Ti834合金激光冲击强化层显微组织及性能研究[J].稀有金属材料与工程,2019,48(11):3535~3540.[Zan Yaoxu, Jia Weiju, Zhao Hengzhang, Mao Xiaonan, Fan Jianfeng, Zhou Lian. Effects of laser shock processing on microstructure and mechanical properties of Ti834 alloy[J]. Rare Metal Materials and Engineering,2019,48(11):3535~3540.]
DOI:10.12442/j. issn.1002-185X.20181181

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  • 收稿日期:2018-11-23
  • 最后修改日期:2018-12-27
  • 录用日期:2019-02-21
  • 在线发布日期: 2019-12-10
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