目的 研究不同激光冲击、激光冲击-喷丸复合强化工艺参数对AISI 9310钢残余应力的强化效果。方法 选择激光冲击与喷丸强化AISI 9310钢材料本构模型,确定有限元分析中激光冲击波的加载方式,基于Abaqus软件建立AISI 9310钢激光冲击、激光冲击-喷丸复合强化数值分析模型,分析网格尺寸对残余应力的影响,探究不同激光功率密度与激光光斑尺寸对AISI 9310钢残余应力的影响规律,验证有限元模型的可靠性,在此基础上,研究不同激光冲击-喷丸复合强化工艺参数对残余应力的影响效果。结果 在激光冲击强化下,随着激光功率密度的增大,材料表面中心位置的残余压应力与残余压应力峰值均增加,当最大激光功率密度为14.5 GW/cm2时,引入中心表面残余压应力为-719.4 MPa,残余压应力层深度超过500 μm;随着光斑尺寸的增大,残余压应力强化层深、强化区域及强化区域峰值均增加,当最大光斑直径为3 mm时,引入残余压应力层最深约800 μm,残余压应力峰值最大,为-687.87 MPa。激光冲击-喷丸复合强化引入材料表面中心位置的残余压应力为-1 121.36 MPa,与单一激光冲击强化效果相比,残余压应力有效提升。残余压应力峰值位于次表层距离表面约80 μm处,最大为-1 392.56 MPa,与单一激光冲击强化相比,残余压应力峰值提升,且所处位置下移,但复合强化后表面残余应力分布波动较大。结论 较大的激光功率密度与较大的光斑直径可引入较优的残余压应力场,与单一激光冲击强化相比,激光冲击-喷丸复合强化引入的残余应力场提升效果显著。
Abstract
The work aims to study the effect of different laser shock peening and laser shock peening-shot peening process parameters on the residual stress strengthening of AISI 9310 steel. The constitutive model of laser shock peening and shot peening strengthened AISI 9310 steel was selected to determine the loading mode of laser shock wave in finite element analysis. The numerical analysis model of laser shock peening and laser shock peening-shot peening strengthening of AISI 9310 steel was established based on Abaqus software. The effect of mesh size on residual stress was analyzed, and the effect laws of different laser power densities and laser spot sizes on the residual stress of AISI 9310 steel were explored. Then, the reliability of the finite element model was verified. On this basis, the effect of laser shock peening-shot peening strengthening on the residual stress was studied. Under laser shock peening strengthening, as the laser power density increased, the residual compressive stress at the center of the material surface and the peak value of the residual compressive stress both increased. When the maximum laser power density was 14.5 GW/cm2, the residual compressive stress introduced at the center of the surface was -719.4 MPa, and the depth of the residual compressive stress layer exceeded 500 μm. As the spot size increased, the depth of the residual compressive stress strengthening layer, the strengthening area, and the peak value of the strengthening area all increased. When the maximum spot diameter was 3 mm, the residual compressive stress layer introduced was the deepest, about 800 μm, and the peak value was the largest, -687.87 MPa. The residual compressive stress introduced at the center of the material surface by laser shock-shot peening strengthening was -1 121.36 MPa. Compared with the effect of single laser shock strengthening, the residual compressive stress was effectively enhanced. The peak value of the residual compressive stress was located at the subsurface about 80 μm from the surface, with a maximum of -1 392.56 MPa, which was higher than that under single laser shock peening strengthening, and the location was lower, but the surface residual stress distribution fluctuated greatly after composite strengthening. Larger laser power density and larger spot diameter can introduce better residual compressive stress field, and the residual stress field introduced by laser shock peening-shot peening is more effective than that by single laser shock peening.
关键词
AISI 9310钢 /
残余应力 /
激光冲击 /
有限元分析 /
复合强化
Key words
AISI 9310 steel /
residual stress /
laser shock peening /
finite element analysis /
composite strengthening
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基金
国家自然科学基金（51705471）; 河南省自然科学基金（242300420052）; 郑州航院研究生教育创新计划基金项目（2024CX100）
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