Abstract
Hydrogen embrittlement (HE) of selective laser melting (SLM) 316 L stainless steel was investigated by tensile tests in the 80–300 K temperature range. The abnormal formation of strain-induced α′ martensite (SIM) at 300 K was attributed to the interaction between deformation twins and cellular sub-grains. Deformation twinning contributes greatly to HE at 300 K, resulting in hydrogen induced cleavage fracture along the twin boundaries. SIM forming at twin/twin and twin/grain boundary intersections further enhances the HE at slightly lower temperatures (273 K, 233 K). In contrast, hydrogen enhances the ductility of SLM316L by promoting the deformation twinning and SIM at 80 K.
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