线偏振激光斜冲击实验与理论研究
Experiment and Theoretic Analysis of Linear Polarized Laser Oblique Shock
查看参考文献17篇
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文摘
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目的研究激光冲击强化中冲击角度对强化效果的影响。方法采用波长为1064 nm、脉冲能量为7 J、脉冲宽度为12 ns的YAG激光器对TC4钛合金表面进行冲击强化处理,得到经不同偏振方向、冲击角度冲击后的材料的表面形貌、硬度和残余应力。通过菲涅耳定律分析了不同偏振光斜冲击加工效果的差异。结果随着冲击角度的增大,冲击后形成的微坑深度逐渐减少,且正交偏振光减少的程度大于平行偏振光减少的程度,在超过30°的时候尤为明显。随着冲击角度的增大,试样表面显微硬度逐渐下降,当用平行偏振光斜冲击时,硬度下降较慢;而用正交偏振光斜冲击且冲击角度超过15°时,硬度下降较快。随着冲击角度增加,由于“残余应力洞”的影响,中心残余压应力值先增大后减少。结论在一定情形下,选用一定角度的斜冲击可以有效避免残余应力洞的产生。该研究得到的结论可以为复杂结构件激光冲击强化冲击轨迹规划提供一定的参考。 |
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其他语种文摘
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The work aims to study the influence of shock angles on the strengthening effect for laser shock peening. TC4 titanium alloy samples were treated by YAG laser system with wavelength of 1064 nm, pulse-energy of 7 J and pulse-width of 12 ns. The surface topography, residual stress and microhardness of the samples shocked in different polarization directions by different shock angles were obtained. The difference of impact processing effect for different polarized oblique laser was analyzed by the Fresnel's law. With the increase of the shock angle, the pit depth of the samples caused by the shock gradually reduced. The depth decrease by the orthogonal polarization laser was more obvious compared with that by the parallel polarization laser, particularly when the angle exceeded 30°. As the shock angle increased, the microhardness of samples gradually decreased. The microhardness decreased slowly for parallel polarized laser. However, the microhardness decreased rapidly for orthogonal polarized laser when the shock angle exceeded 15°. When the shock angle increased, the centeral residual stress increased first and then decreased. The residual stress hole can be solved effectively by choosing the appropriate shock angle in some cases. The conclusions can provide guidance for the laser shock peening trajectory planning of complex structures workpieces. |
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来源
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表面技术
,2019,48(1):126-132 【核心库】
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DOI
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10.16490/j.cnki.issn.1001-3660.2019.01.016
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关键词
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激光技术
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激光冲击强化
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冲击角度
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偏振方向
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钛合金
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地址
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中国科学院沈阳自动化研究所装备制造技术研究室, 沈阳, 110016
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中国科学院机器人与智能制造创新研究院, 沈阳, 110016
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中国科学院大学计算机与控制学院, 北京, 100049
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美国阿拉巴马大学机械工程系, 塔斯卡卢萨, AL35487
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-3660 |
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学科
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金属学与金属工艺;电子技术、通信技术 |
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基金
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国家重点研发计划
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国家基金委-辽宁省联合基金
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国家自然科学基金
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文献收藏号
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CSCD:6438399
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