Laser Shock Peening Induced Back Stress Mitigation in Rolled Stainless Steel
Laser Shock Peening Induced Back Stress Mitigation in Rolled Stainless Steel
复制标题
激光冲击强化轧制不锈钢中引起的背应力减轻
DOI：
10.1115/1.4052909
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Lawrence Yao, Y.
中科院分区：
文献类型：
--
作者：
Over, Veronica;Lawrence Yao, Y.
研究了激光冲击强化（LSP）作为一种潜在的降低拉伸背应力的工具，在这里显示应用于轧制和退火的304 L奥氏体钢。从滞后拉伸试验中提取处理和未处理的狗骨样品的背应力。电子背散射衍射（EBSD）和取向成像显微镜（OIM）分析量化的几何必要的位错（GND）密度分布的未应变和应变以及unpeened和peened条件。有限元分析（FEA）模拟使用已知的LSP压力模型和齐格勒的非线性运动硬化定律对通过拉伸测试和LSP处理的背应力和残余应力发展进行建模。通过对拉伸试验应力-应变的非线性回归拟合，提取了用于数值研究的随动硬化参数。这项研究表明，LSP可以用来克服制造设计的挑战所提出的屈服不对称，由于在轧制钢的背应力。
Laser shock peening (LSP) is investigated as a potential tool for reducing tensile back stress, shown here applied to rolled and annealed 304L austenitic steel. The back stress of treated and untreated dog-bone samples is extracted from hysteresis tensile testing. Electron back-scatter diffraction (EBSD) and orientation imaging microscopy (OIM) analysis quantify the geometrically necessary dislocation (GND) density distribution of unstrained and strained as well as unpeened and peened conditions. Finite element analysis (FEA) simulation models back stress and residual stress development through tensile testing and LSP treatment using known LSP pressure models and Ziegler's nonlinear kinematic hardening law. Nonlinear regression fitting of tensile testing stress–strain in as-received specimens extracts the kinematic hardening parameters that are used in numerical study. This research shows LSP may be used to overcome manufacturing design challenges presented by yield asymmetry due to back stress in rolled steel.