Hydrogen uptake and its influence in selective laser melted austenitic stainless steel: A nanoindentation study

SCRIPTA MATERIALIA

卷:194

Article

Park, Jeong-Min¹  Zhao, Yakai²  Voisin, Thomas³  Lee, Dong-Hyun⁴  Komazaki, Shin-ichi⁵  Ko, Yoonseok^6,7  Kim, Dong-Ik⁶  Suh, Jin-Yoo⁶  Han, Heung Nam⁷  Wang, Y. Morris^3,8  Ramamurty, Upadrasta²  Jang, Jae-il¹ 

[1] Hanyang Univ, Div Mat Sci & Engn, Seoul 04763, South Korea

[2] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

[3] Lawrence Livermore Natl Lab, Div Mat Sci, Livermore, CA 94550 USA

[4] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[5] Kagoshima Univ, Dept Mech Engn, Kagoshima 8900065, Japan

[6] Korea Inst Sci & Technol, Ctr Energy Mat Res, Seoul 02792, South Korea

[7] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea

[8] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

关键词: Additive manufacturing;    Hydrogen;    Nanoindentation;    Austenitic stainless steel;    Selective laser melting;   

DOI  :  10.1016/j.scriptamat.2020.113718

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free