Park, Jeong-Min Zhao, Yakai Voisin, Thomas Lee, Dong-Hyun Komazaki, Shin-ichi Ko, Yoonseok Kim, Dong-Ik Suh, Jin-Yoo Han, Heung Nam Wang, Y. Morris Ramamurty, Upadrasta Jang, Jae-il 2024-01-19T15:04:06Z 2024-01-19T15:04:06Z 2022-01-10 2021-03-15 1359-6462 https://pubs.kist.re.kr/handle/201004/117257 The effect of hydrogen (H) charging on the nanoindentation response of a selective laser melted (SLM) 316L austenitic stainless steel was investigated and compared with its conventionally manufactured (CM) counterpart. Results show that the hardness increment in the SLM samples due to H charging is relatively smaller. Thermal desorption spectroscopy analysis suggests that the charged SLM alloy has not only a smaller H content but a lower apparent H diffusivity in comparison to the CM alloy. This was attributed to the ultrafine solidification cell structure in the SLM alloy. Through the 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. These results are discussed in terms of the apparent H solubility and diffusivity in the SLM alloy. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Hydrogen uptake and its influence in selective laser melted austenitic stainless steel: A nanoindentation study Article 10.1016/j.scriptamat.2020.113718 1 SCRIPTA MATERIALIA, v.194 SCRIPTA MATERIALIA 194 scie scopus 000632783300087 2-s2.0-85099178306 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Metallurgy & Metallurgical Engineering Article Additive manufacturing Hydrogen Nanoindentation Austenitic stainless steel Selective laser melting