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Ringer, Simon P.

Wang, Qi

Yuya, Murata

Zhu, Suqin

English

Engineering Conferences International

INTEGRATED ANALYSIS OF HYDROGEN EMBRITTLEMENT MECHANISMS OF A STEEL FROM ITS MECHANICAL BEHAVIOURS AND ATOM PROBE TOMOGRAPHY  Suqin Zhu, The University of Sydney, NSW 2006, Australia, School of Aerospace, Mechanical and Mechatronic Engineering, and Australian Centre for Microscopy & Microanalysis suqin.zhu@sydney.edu.au Qi Wang, The University of Sydney, NSW 2006, Australia, School of Aerospace, Mechanical and Mechatronic Engineering, and Australian Centre for Microscopy & Microanalysis Murata Yuya, Applied Physics Research Laboratory, Kobe Steel, Ltd., 1-5-5, Takatsukadai, Japan Simon P. Ringer, The University of Sydney, NSW 2006, Australia, School of Aerospace, Mechanical and Mechatronic Engineering, and Australian Centre for Microscopy & Microanalysis   Tackling the hydrogen embrittlement (HE) phenomenon by direct observation of hydrogen in metallic materials has been a long-standing challenge for hydrogen being the lightest element. Atom probe tomography (APT) has been used as a practical microscopy approach to observe the hydrogen-metal interaction at a near-atomic level [1, 2] and has become more popular in the past decades or so [3, 4]. However, an expensive and complicated cryogenic and ultra-high vacuum transfer system is usually required to combat the fast diffusion and/or low solubility of hydrogen in metals, especially in body-centred cubic (bcc) iron. Here, we developed a simple and fast approach to achieve hydrogen observation in APT without special equipment required. We used a FeAlMnTiC bcc ferrite as an example. Our approach enabled the integrated analysis of HE mechanical behaviours with APT analysis for the first time, providing an insight into the link between the HE mechanisms to the directly-observed H/D trapping sites. Our results show that the current steel suffered HE from grain boundary decohesion. The primary trapping sites interior of the grains were at the TiC/ferrite interfaces and along the dislocations hindered by the TiC; however, both the trapping sites might have complicated and dual influences on the HE. The size of the TiC precipitates, and the coherency of different TiC/ferrite interfaces significantly impacted the trapping nature.To increase the HE resistance of the steel, growing the precipitates into coarse and less coherent particles may be adopted, while the dislocation-precipitate interaction should also be considered.    References [1] R. Gemma, T. Al-Kassab, R. Kirchheim, A. Pundt, APT analyses of deuterium-loaded Fe/V multi-layered films, Ultramicroscopy 109 (2009) 631-636. [2] R. Kirchheim, A. Pundt, 25 - Hydrogen in Metals. in: Laughlin DE, Hono K, (Eds.). Physical Metallurgy (Fifth Edition). Elsevier, Oxford, 2014. pp. 2597-2705. [3] J. Takahashi, K. Kawakami, Y. Kobayashi, T. Tarui, The first direct observation of hydrogen trapping sites in TiC precipitation-hardening steel through atom probe tomography, Scripta Materialia 63 (2010) 261-264. [4] Y.-S. Chen, H. Lu, J. Liang, A. Rosenthal, H. Liu, G. Sneddon, I. McCarroll, Z. Zhao, W. Li, A. Guo, J.M. Cairney, Observation of hydrogen trapping at dislocations, grain boundaries, and precipitates, Science 367 (2020) 171-175.   

Integrated analysis of hydrogen embrittlement mechanisms of a steel from its mechanical behaviours and atom probe tomography

https://dc.engconfintl.org/cgi/viewcontent.cgi?filename=0&article=1033&context=hydrogen&type=additional

Integrated analysis of hydrogen embrittlement mechanisms of a steel from its mechanical behaviours and atom probe tomography

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