液氢温度下316plus（EN 1.4420）不锈钢的低温氢脆现象
Cryogenic hydrogen embrittlement of 316plus (EN 1.4420) stainless steel at 77 K and 20 K
AI总结：
研究了液氢存储用316plus不锈钢在77K和20K下的氢-温度耦合效应，通过拉伸试验、断口分析和EBSD量化应变诱导马氏体，发现低温下氢脆显著，但材料仍保持一定韧性。
摘要：
本文首次实验研究了316plus（EN 1.4420）不锈钢在77K和20K下的氢-温度耦合效应。通过拉伸试验、断口分析和EBSD量化应变诱导马氏体（SIM），发现316plus在77K和20K下表现出冷脆效应，通过增强的SIM形成实现了冷脆强化。氢在室温或77K下不影响强度，但在20K下导致强度略微下降约10%，使316plus保持在316L的冷脆强度上限。氢在所有温度下均显著降低延展性，特别是在77K和20K下（降低约40-50%）。氢在20K下抑制了SIM，但SIM分数与延展性降低无相关性。尽管温度和氢的共同作用，316plus仍保留了显著的延展性（面积减少约30%）
英文摘要：
This paper presents the first experimental characterisation of combined hydrogen-temperature effects in 316plus (EN 1.4420), a new austenitic stainless steel for liquid hydrogen (LH2) storage. Uniaxial tensile tests were conducted at room temperature (RT), 77 K and 20 K on uncharged and hydrogen-precharged specimens, complemented by fractography and EBSD-based quantification of strain-induced martensite (SIM). 316plus exhibited cryogenic strengthening at 77 K and 20 K by enhanced SIM formation. Hydrogen did not influence strength at RT or 77 K and caused a modest decrease (~10%) at 20 K, keeping 316plus at the upper bound of cryogenic strength for 316L. The presence of hydrogen resulted in significant reductions in ductility at all temperatures, being most severe at 77 and 20K (~40-50%). Hydrogen suppressed SIM at 20 K, but SIM fraction did not correlate with ductility reduction. Despite the combined effect of temperature and hydrogen, 316plus retained notable ductility (reduction in area ~30%).
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