|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing for Energy Applications III
||A Nanomechanical Investigation on the Hydrogen Uptake and Its Influence in Selective Laser Melted Austenitic Stainless Steel
||Yakai Zhao, Jeong-Min Park, Y. Morris Wang, Upadrasta Ramamurty, Jae-il Jang
|On-Site Speaker (Planned)
The influence of hydrogen (H) charging on the nanoindentation response of an additively manufactured (AM) 316L austenitic stainless steel by selective laser melting (SLM) was investigated and compared with its conventionally manufactured (CM) counterpart. Results show that the hardness increment in the AM samples due to H charging is relatively smaller. Thermal desorption analysis suggested that AM alloy has not only a smaller H content but also a lower apparent H diffusivity compared to the CM alloy, which was attributed to the solidification cell structure present in the AM alloy. By means of low-load nanoindentation experiments and forward-scattered electron imaging analysis, statistical distributions of the hardness of the cell walls and interiors were assessed. The cell walls, consisting of high-density dislocations with segregated elements, were relatively insensitive to H charging than the cell interiors. The results are discussed in terms of the apparent H solubility and diffusivity in AM alloys.