Hydrogen uptake and its influence in selective laser melted austenitic stainless steel: A nanoindentation study
- Title
- Hydrogen uptake and its influence in selective laser melted austenitic stainless steel: A nanoindentation study
- Author
- 장재일
- Keywords
- Additive manufacturing; Austenitic stainless steel; Hydrogen; Nanoindentation; Selective laser melting
- Issue Date
- 2021-03
- Publisher
- Acta Materialia Inc
- Citation
- Scripta Materialia, v. 194, article no. 113718
- Abstract
- 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. © 2021
- URI
- https://repository.hanyang.ac.kr/handle/20.500.11754/178274https://www.sciencedirect.com/science/article/pii/S135964622030840X?via%3Dihub
- ISSN
- 1359-6462
- DOI
- 10.1016/j.scriptamat.2020.113718
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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