Neutron diffraction characterization of strain/stress field of 316L Stainless Steel « walls » made with Wire + Arc Additive Manufacturing te

The studied 316L SS samples were obtained with successive deposition of molten metallic wire using electrical arc generated with a welding process : Gas Metal Arc Welding (GMAW). Such process is called Wire + Arc Additive Manufacturing.The main goal is to measure the residual strain field into the base plate (BP) and overlaid deposits (so the sample). Another objective is to observe the effect of a new deposit on the residual stress field induced by the previous one. These data will help validating the thermo-mechanical simulation and the material behavior law (PhD project of Camille CAMBON Oct.2017 to Sept. 2020). Secondly, we expect to observe a change in the residual stresses of the part when the operating conditions are modified (welding intensity, welding speed, cooling time …) by characterizing two samples built with 2 sets of process parameters (with 5 deposits).

本研究所用的316L不锈钢（316L Stainless Steel, 316L SS）试样，采用基于焊接电弧的熔融金属丝连续沉积工艺制备，即熔化极气体保护电弧焊（Gas Metal Arc Welding, GMAW），该工艺亦被称为丝材电弧增材制造（Wire + Arc Additive Manufacturing）。
本数据集的核心目标为：测量基板（base plate, BP）以及沉积层（即试样）内部的残余应变场；另一研究目的为探究新增沉积层对前序工序诱发的残余应力场的影响。相关数据将用于验证Camille CAMBON于2017年10月至2020年9月开展的博士研究项目中的热-力学仿真模型与材料行为定律。
其次，本研究拟通过表征两组不同工艺参数制备的各含5层沉积的试样，观测工艺参数调整（如焊接热输入强度、焊接速度、冷却时长等）对构件残余应力分布的影响。