Abstract This paper reports a comprehensive study of the stress corrosion crack growth behaviour of laser additively-manufactured (AM) 316L stainless steel in high temperature water. A wide range of parameters and their effects were evaluated, including microstructure, heat treatment, stress intensity factor, cold work, crack orientation, oxidizing vs. reducing conditions, and porosity. Stress-relieved material exhibits anisotropic microstructure and preferred crack path along material’s build direction. With high-temperature annealing, the material recrystallizes to equiaxed structure and behaves like wrought material. The retained unrecrystallized grains in an annealed AM part may not affect the cracking. Increased porosity may enhance the crack growth rate.

中文翻译：

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激光粉末床熔融增材制造316L不锈钢在高温水中应力腐蚀裂纹扩展行为

摘要 本文综合研究了激光增材制造 (AM) 316L 不锈钢在高温水中的应力腐蚀裂纹扩展行为。评估了广泛的参数及其影响，包括微观结构、热处理、应力强度因子、冷加工、裂纹取向、氧化与还原条件以及孔隙率。消除应力的材料表现出各向异性的微观结构和沿材料构建方向的首选裂纹路径。通过高温退火，材料再结晶为等轴结构，表现得像锻造材料。退火 AM 零件中残留的未再结晶晶粒可能不会影响开裂。增加的孔隙率可提高裂纹扩展速率。