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中文摘要：
采用层层正交路径进行了316L不锈钢块体试样的MIG堆焊快速成形,研究了堆焊试样的组织和力学性能。组织观察显示,随堆焊高度的增加,堆焊层中晶粒组织逐渐变得粗大,且铁素体数量增加。显微硬度分析表明,随堆焊层数的增加,堆焊部分的显微硬度呈先增后减的变化趋势。室温拉伸结果显示,堆焊成形试样的拉伸性能达到锻件标准,且沿垂直于焊接方向试样的抗拉强度和伸长率均优于沿着焊接方向。
英文摘要：
Orthogonal path in adjacent layers was used for MIG overlying welding rapid forming of 316L stainless steel. The microstructure and mechanical properties of the welded samples were studied. The microstructure observation shows that with the increase of deposition height, grains in the overlaying layer gradually coarsens and the amount of ferrite increases. The analysis of microhardness shows that the hardness firstly increases and then decreases with the increase of overlaying layers. The room temperature tensile tests shows that tensile strength of the arc overlying rapid forming samples reaches the standard of forging 316L stainless steel, and the tensile strength and elongation vertical to the welding direction are higher, compared with the parallel direction of the welding.
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