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The effects of laser peening on laser additive manufactured 316L steel
The International Journal of Advanced Manufacturing Technology ( IF 3.4 ) Pub Date : 2020-03-17 , DOI: 10.1007/s00170-020-05167-3
Yi Lu , G. F. Sun , Z. D. Wang , B. Y. Su , Y. K. Zhang , Z. H. Ni

Abstract

Laser peening has an extensive application in traditional manufacturing industry. However, in additive manufacturing, the initial stresses on the parts often reduce the effects of laser peening and make it hard to achieve a desirable residual stress distribution. In this investigation, the interaction of initial residual stress and laser peening-induced stress was studied through numerical simulation and experimental tests. A finite element model (FEM) model was built to predict the stress distribution on laser-deposited sample, and its changed state is affected by laser peening. The microstructure and mechanical properties were also characterized experimentally. The result turned out that the thermal-induced tensile residual stress in laser-deposited sample can affect the laser peening result in both horizontal and longitudinal directions. Some mechanical properties of the LAMed sample were changed after LSP treatment. The hardness on the surface and 1-mm depth have been increased by 7% and 22%, respectively, and the yield strength was increased by 16%, while there is no significant change in the tensile strength and elongation rate.



中文翻译:

激光喷丸处理对激光添加剂制造的316L钢的影响

摘要

激光喷丸在传统制造业中有着广泛的应用。但是,在增材制造中,零件上的初始应力通常会降低激光喷丸的影响,并使其难以获得理想的残余应力分布。在这项研究中,通过数值模拟和实验测试研究了初始残余应力和激光喷丸引起的应力之间的相互作用。建立了有限元模型(FEM)模型来预测激光沉积样品上的应力分布,其变化状态会受到激光喷丸的影响。微观结构和力学性能也进行了实验表征。结果表明,激光沉积样品中的热诱导拉伸残余应力会在水平和纵向方向上影响激光喷丸的结果。LSP处理后,LAMed样品的某些机械性能发生了变化。表面硬度和1mm深度分别增加了7%和22%,屈服强度增加了16%,而抗张强度和伸长率没有明显变化。

更新日期:2020-03-20
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