Abstract
Selective laser melting (SLM), one of the 3D printing technologies can be used to produce a variety of complex parts for hydrogen service. In this study, 304 austenitic stainless steel (ASS) samples are manufactured by SLM technology with building directions of 0°, 45° and 90°. The results show that the 3D-0° sample with equiaxed grain has lower strength and ductility, but better HE resistance; and the strength and plasticity of 3D-45° sample with mainly inclined grains are higher, but the HE resistance is a little worse; while 3D-90° sample dominated by columnar grains cannot be used in the structural parts due to the poor mechanical properties.
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