316 stainless steel was fabricated with novel low-power pulsed laser-induced gas tungsten arc additive manufacturing (LGTA-AM). Compared with gas tungsten arc additive manufacturing (GTA-AM) process, the microstructure, phase composition and room temperature mechanical property were investigated. Compared with the micro-molding of walls fabricated by GTA-AM, the room temperature micro-structure of the two processes are composed of A and δ ferrite. The austenite grains show cell-like crystals → columnar crystals → dendrites → equiaxed crystals from bottom to top of 8-layer wall. The ferrite morphology of the GTA-AM specimens captured by SEM was strip-shaped, skeleton-shaped, sieve-shaped, and worm-shaped in order from bottom to top. The ferrite morphology of LGTA-AM specimens captured by SEM is strip-shaped, fine-mesh-shaped, reticulate-shaped, and fish-scaled in order from bottom to top. LGTA-AM can uniformly refine the micro-structure and accelerate the transformation rate from ferrite to austenite. The hardness value of the AM wall from the bottom to the top shows a trend of decreasing first and then increasing. The LGTA-AM process can improve the uniformity of the interlayer transition and reduce the anisotropy of the grains.

316 不锈钢采用新型低功率脉冲激光诱导气体钨极电弧增材制造 (LGTA-AM) 制造。与气体钨极电弧增材制造（GTA-AM）工艺相比，研究了显微组织、相组成和室温力学性能。与GTA-AM制造的墙体微成型相比，两种工艺的室温显微组织均由A和δ铁素体组成。奥氏体晶粒从8层壁的底部到顶部呈现胞状晶体→柱状晶体→枝晶→等轴晶。SEM捕获的GTA-AM试样的铁素体形貌从下到上依次为条状、骨架状、筛状和蠕虫状。SEM 捕获的 LGTA-AM 试样铁素体形貌为条状、细网状、网状、和鱼鳞从下到上的顺序。LGTA-AM可以均匀细化显微组织，加快铁素体向奥氏体的转变速度。AM壁的硬度值自下而上呈先减小后增大的趋势。LGTA-AM工艺可以提高层间转变的均匀性，降低晶粒的各向异性。