Abstract The grain boundary character distribution (GBCD) in an austenitic stainless steel produced by additive manufacturing (AM) in both as-built and annealed conditions was studied. Relatively fine grains and a non-fibre texture was achieved by AM, and as-built structure showed a high population of Σ3 boundaries. A five-parameter GBCD analysis revealed that the microstructure is mostly dominated by highly incoherent Σ3 boundaries. The grain boundary network also consisted of random high angle, coherent Σ3s terminating on (111) planes with a pure twist character, and tilt Σ9 boundaries. The findings show prospects for the possibility of engineering the grain boundary network of materials in-situ, via the stress and heat induced by the thermal cycles during AM.

中文翻译：

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增材制造奥氏体不锈钢的晶界特征分布

摘要 研究了通过增材制造 (AM) 生产的奥氏体不锈钢在竣工和退火条件下的晶界特征分布 (GBCD)。AM 获得了相对细小的晶粒和非纤维质地，并且竣工结构显示出大量的 Σ3 边界。五参数 GBCD 分析表明，微观结构主要由高度不相干的 Σ3 边界主导。晶界网络还包括随机大角度、以纯扭曲特征终止于 (111) 平面的相干 Σ3s 和倾斜 Σ9 边界。研究结果表明，通过 AM 期间热循环引起的应力和热量，原位设计材料的晶界网络的可能性具有前景。