线偏振激光斜冲击实验与理论研究
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摘要
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。
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, par-ticularly 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.
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, par-ticularly 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.
引文
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[13]汪静雪,章艳,张兴权,等.激光参数对圆杆件残余应力场影响的数值模拟[J].中国激光,2016(8):132-139.WANG Jing-xue,ZHANG Yan,ZHANG Xing-quan,et al.Numerical simulation of residual stress field induced in round rod part affected by laser parameters[J].Chinese journal of lasers,2016(8):132-139.
[14]乔红超,赵吉宾.钛合金激光冲击强化参数优化分析[J].光学学报,2013,33(f6):136-140.QIAO Hong-chao,ZHAO Ji-bin.Analysis and optimization on laser peening parameters of titanium alloy[J].Acta optica sinica,2013,33(f6):136-140.
[15]张凌峰,任凤章,周合玉,等.激光冲击过程中等离子体实际作用面积实验研究[J].中国激光,2009,36(5):1224-1228.ZHANG Ling-feng,REN Feng-zhang,ZHOU He-yu,et al.Experimental study on actual role area of plasma in laser shock processing[J].Chinese journal of lasers,2009,36(5):1224-1228.
[16]李景镇.光学手册[M].西安:陕西科学技术出版社,2010.LI Jing-zhen.Handbook of optics[M].Xi'an:Shaanxi Science and Technology Press,2010.
[17]HU Y X,YAO Z Q.FEM simulation of residual stresses induced by laser shock with overlapping laser spots[J].Acta metallurgica sinica(english letters),2008,21(2):125-132.
[2]QIAO Hong-chao,ZHAO Ji-bin,ZHANG Gong-xuan,et al.Effects of laser shock peening on microstructure and residual stress evolution in Ti-45Al-2Cr-2Nb-0.2B alloy[J].Surface&coatings technology,2015,276:145-151.
[3]SALIMIANRIZ A,FOROOZMEHR E,BADROSSAMAYM,et al.Effect of laser shock peening on surface properties and residual stress of Al6061-T6[J].Optics&lasers in engineering,2016,77:112-117.
[4]曹子文,杨清,高宇.激光冲击强化TC17钛合金室温和高温拉伸性能研究[J].表面技术,2018,47(3):85-90.CAO Zi-wen,YANG Qing,GAO Yu.Tensile properties at room and high temperature of TC17 titanium alloy treated by laser shock peening[J].Surface technology,2018,47(3):85-90.
[5]YE Y X,XUAN T,LIAN Z C,et al.Investigation of the crater-like microdefects induced by laser shock processing with aluminum foil as absorbent layer[J].Applied surface science,2015,339(1):75-84.
[6]SEALY M P,GUO Y B,CASLARU R C,et al.Fatigue performance of biodegradable magnesium-calcium alloy processed by laser shock peening for orthopedic implants[J].International journal of fatigue,2016,82:428-436.
[7]CARALAPATTI V K,NARAYANSWAMY S.Analyzing the effect of high repetition laser shock peening on dynamic corrosion rate of magnesium[J].Optics&laser technology,2017,93:165-174.
[8]乔红超,赵亦翔,赵吉宾,等.激光冲击强化对TiAl合金组织和性能的影响[J].光学精密工程,2014,22(7):1766-1773.QIAO Hong-chao,ZHAO Yi-xiang,ZHAO Ji-bin,et al.Effect of laser peening on microstructures and properties of TiAl alloy[J].Optics&precision engineering,2014,22(7):1766-1773.
[9]SOKOL D W,CLAUER A H,DULANEY J L,et al.Applications of laser peening to titanium alloys[C]//Conference on lasers and electro-optics/quantum electronics and laser science and photonic applications,systems and technologies.Baltimore:Optical Society of America,2005.
[10]FANG Y W,LI Y H,HE W F,et al.Numerical simulation of residual stresses fields of DD6 blade during laser shock processing[J].Materials&design,2013,43:170-176.
[11]张永康,张雷洪,周建忠,等.激光斜冲实验与理论研究[J].中国激光,2005,32(10):1437-1440.ZHANG Yong-kang,ZHANG Lei-hong,ZHOU Jian-zhong,et al.Oblique angle laser shock experiment and theoretic analyse[J].Chinese journal of lasers,2005,32(10):1437-1440.
[12]YANG C H,HODGSON P D,LIU Q C,et al.Geometrical effects on residual stresses in 7050-T7451 aluminum alloy rods subject to laser shock peening[J].Journal of materials processing tech,2008,201(1):303-309.
[13]汪静雪,章艳,张兴权,等.激光参数对圆杆件残余应力场影响的数值模拟[J].中国激光,2016(8):132-139.WANG Jing-xue,ZHANG Yan,ZHANG Xing-quan,et al.Numerical simulation of residual stress field induced in round rod part affected by laser parameters[J].Chinese journal of lasers,2016(8):132-139.
[14]乔红超,赵吉宾.钛合金激光冲击强化参数优化分析[J].光学学报,2013,33(f6):136-140.QIAO Hong-chao,ZHAO Ji-bin.Analysis and optimization on laser peening parameters of titanium alloy[J].Acta optica sinica,2013,33(f6):136-140.
[15]张凌峰,任凤章,周合玉,等.激光冲击过程中等离子体实际作用面积实验研究[J].中国激光,2009,36(5):1224-1228.ZHANG Ling-feng,REN Feng-zhang,ZHOU He-yu,et al.Experimental study on actual role area of plasma in laser shock processing[J].Chinese journal of lasers,2009,36(5):1224-1228.
[16]李景镇.光学手册[M].西安:陕西科学技术出版社,2010.LI Jing-zhen.Handbook of optics[M].Xi'an:Shaanxi Science and Technology Press,2010.
[17]HU Y X,YAO Z Q.FEM simulation of residual stresses induced by laser shock with overlapping laser spots[J].Acta metallurgica sinica(english letters),2008,21(2):125-132.
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