Hydrogen depth profiles and microhardness of electrochemically hydrogen-charged nanostructured bainitic steels

Kazum, Oluwole, Ionescu, Mihail, Beladi, Hossein, and Kannan, M. Bobby (2019) Hydrogen depth profiles and microhardness of electrochemically hydrogen-charged nanostructured bainitic steels. International Journal of Hydrogen Energy, 44 (26). pp. 14064-14069.

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Abstract

Hydrogen depth profiles and microhardness of the electrochemically hydrogen-charged nanostructured bainitic steels (produced at two different transformation temperatures, i.e. 200 degrees C (NBS200) and 350 degrees C (NBS350)) were obtained using elastic recoil detection analysis (ERDA) technique and Vickers microhardness testing, respectively, and compared to that of mild steel. The ERDA results showed that the subsurface hydrogen concentration was higher in NBS200, followed by NBS350 and mild steel. However, the microhardness data of the hydrogen-charged steels revealed material softening in NBS200 and NBS350, whereas the mild steel exhibited material hardening effect. The microhardness along the cross-sectional depth of the steels showed that the softening effect in NBS200 was closer to the hydrogen-charged surface compared to that of NBS350. The plausible mechanisms for the softening effect in the NBS200 and NBS350, and hardening effect in mild steel have been discussed in this paper. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Item ID: 60026
Item Type: Article (Research - C1)
ISSN: 1879-3487
Keywords: Nanostructured bainitic steels, Hydrogen-induced softening, Microhardness, Electrochemical hydrogen-charging, Hydrogen depth profile
Copyright Information: © 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved
Funders: Australian Government (AG)
Projects and Grants: AG NCRIS funding scheme for the Centre for Accelerator Science facility, AINSE PGRA scholarship scheme, JCUIPRS scholarship scheme
Date Deposited: 26 Jun 2019 07:35
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091207 Metals and Alloy Materials @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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