Hydrogen was doped in austenitic stainless steel (ASS) 316L tensile samples produced by the laser-powder bed fusion (L-PBF) technique. For this aim, an electrochemical method was conducted under a high current density of 100 mA/cm² for three days to examine its sustainability under extreme hydrogen environments at ambient temperatures. The chemical composition of the starting powders contained a high amount of Ni, approximately 12.9 wt.%, as a strong austenite stabilizer. The tensile tests disclosed that hydrogen charging caused a minor reduction in the elongation to failure (approximately 3.5% on average) and ultimate tensile strength (UTS; approximately 2.1% on average) of the samples, using a low strain rate of 1.2 × 10⁻⁴ s⁻¹. It was also found that an increase in the strain rate from 1.2 × 10⁻⁴ s⁻¹ to 4.8 × 10⁻⁴ s⁻¹ led to a reduction of approximately 3.6% on average for the elongation to failure and 1.7% on average for UTS in the pre-charged samples. No trace of martensite was detected in the X-ray diffraction (XRD) analysis of the fractured samples thanks to the high Ni content, which caused a minor reduction in UTS × uniform elongation (UE) (GPa%) after the H charging. Considerable surface tearing was observed for the pre-charged sample after the tensile deformation. Additionally, some cracks were observed to be independent of the melt pool boundaries, indicating that such boundaries cannot necessarily act as a suitable area for the crack propagation.

中文翻译：

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氢对激光粉末床熔合生产奥氏体不锈钢316L拉伸性能的影响

氢掺杂在通过激光粉末床熔合（L-PBF）技术生产的奥氏体不锈钢（ASS）316L拉伸样品中。为了该目的，在100mA / cm ²的高电流密度下进行了三天的电化学方法以检查其在极端氢气环境下在环境温度下的可持续性。起始粉末的化学组成包含大量的Ni，约12.9重量％，作为强奥氏体稳定剂。拉伸试验公开了充氢引起的延伸率的微小降低到故障（平均约3.5％）和极限拉伸强度（UTS;平均约2.1％）的样品中，使用1.2×10的低应变速率^{- 4}秒^-1。还发现应变率从1.2×10 ^-4 s ^-1增加到4.8×10 ^-4 s ^-1导致预充电样品的断裂伸长率平均降低约3.6％，UTS平均降低1.7％。由于镍含量高，在断裂样品的X射线衍射（XRD）分析中未检测到马氏体的痕迹，这导致H装填后UTS×均匀伸长率（UE）（GPa％）略有降低。在拉伸变形之后，对于预充电的样品观察到相当大的表面撕裂。另外，观察到一些裂纹独立于熔池边界，表明这些边界不一定充当裂纹扩展的合适区域。