孙汝剑,李刘合,朱颖,彭鹏,张利新,于文花,郭伟.激光冲击强化对TC17钛合金微观组织及拉伸性能的影响[J].稀有金属材料与工程,2019,48(2):491~499.[SUNRUJIAN,LILIUHE,ZHUYING,PENGPENG,ZHANGLIXIN,YUWENHUA,GUOWEI.Effect of laser shock peening on microstructure and tensile property of TC17 titanium alloy[J].Rare Metal Materials and Engineering,2019,48(2):491~499.]
激光冲击强化对TC17钛合金微观组织及拉伸性能的影响
投稿时间:2017-07-13  修订日期:2017-09-12
中文关键词:  激光冲击强化  显微组织  表面形貌  残余应力  拉伸性能
基金项目:国家国际科技合作专项项目(项目号2013DFR50590);国家自然科学基金(项目号11372019);民用飞机专项科研项目(项目号 MJ-2016-F-16)
中文摘要:
      激光冲击强化能够在材料表面诱导产生高幅值、大深度残余压应力,提高材料抗疲劳、磨损和腐蚀等性能。本文分别采用20J、25J和30J脉冲激光冲击TC17钛合金。采用光学显微镜(OM),扫描电镜(SEM)和透射电镜(TEM)表征25J激光冲击强化对微观组织演变规律的影响;采用激光共聚焦显微镜分析20J、25J 和30J激光冲击强化对表面形貌及粗糙度的影响;采用钻孔法和电子散斑干涉技术测定20J、25J和30J激光冲击强化后试样的残余应力;并研究20J、25J和30J激光冲击强化对其室温拉伸性能的影响。研究结果表明:25J 激光冲击强化后,冲击影响层α相晶粒平均尺寸由激光冲击前的11.17 μm减小到激光冲击强化后的6.93 μm,晶体内部产生高密度位错、孪晶以及层错缺陷,位错密度由冲击前的8.11×1013 m-2增加到冲击后的3.59×1014 m-2。20J,25J,30J激光冲击强化,试样表面粗糙度减小(0.922 μm、0.537 μm、0.305 μm),表面残余应力增大(-213 MPa、-296 MPa、-774 MPa)。激光冲击强化后TC17钛合金屈服强度提升30~70 MPa,断裂形式为韧性断裂,激光冲击强化诱导晶粒细化对TC17钛合金的拉伸强度影响较小。
Effect of laser shock peening on microstructure and tensile property of TC17 titanium alloy
英文关键词:laser shock peening  microstructure  surface topography  residual stress  tensile properties
英文摘要:
      Laser shock peening can enhance fatigue, wear and corrosion resistance of metallic components by generating high-amplitude and large-depth compressive residual stresses on their surface. In our work, a pulse laser with different energies of 20J, 25J and 30J has been employed to peen TC17 titanium alloy. Microstructure evolution of 25J laser shock peened specimen was examined by OM, SEM and TEM. Surface morphology and roughness of 20J, 25J and 30J laser shock peened specimen were studied by confocal laser scanning microscope. Residual stresses of 20J, 25J and 30J laser shock peened specimen were measured based on incremental hole drilling method and ESPI technique. The effects of 20J, 25J and 30J LSP on room temperature tensile properties were further analyzed. Results showed that the average α grain size reduced from 11.17 μm to 6.93 μm after 25J LSP. High density of dislocations and mechanical twins were observed with dislocation density increasing from 8.11×1013 m-2 to 3.59×1014 m-2. Surface roughness decreased from 0.922 μm to 0.537 μm and further decreased to 0.305 μm, while surface residual stresses increased from -213 MPa, to 296 MPa and further increased to -774 MPa after 20J, 25J and 30J LSP, respectively. After LSP, the yield strength increased by a value of 30 to 70 MPa and the morphology of the tensile fracture before and after LSP were both ductile fracture, which indicated that LSP induced grain refinement only had a slight effect on the tensile property of TC17 titanium alloy.
作者单位E-mail
孙汝剑 北京航空航天大学 机械工程及自动化学院 sunrujian@buaa.edu.cn 
李刘合 北京航空航天大学 机械工程及自动化学院 liliuhe@buaa.edu.cn 
朱颖 北京航空航天大学 机械工程及自动化学院 bh_zhuying@buaa.edu.cn 
彭鹏 北京航空航天大学 机械工程及自动化学院 ppeng@buaa.edu.cn 
张利新 中国空间技术研究院  
于文花 北京华航无线电测量研究所  
郭伟 北京航空航天大学 机械工程及自动化学院 gwei@buaa.edu.cn 
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