Hydrogen uptake and its influence in selective laser melted austenitic stainless steel: A nanoindentation study. (15th March 2021)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Scripta materialia. Number 194(2021)
• Publication Date: 2021-03-15
• Subjects: Additive manufacturing -- Hydrogen -- Nanoindentation -- Austenitic stainless steel -- Selective laser melting; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.113718
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: Image, graphical abstract