Analysis of Hydrogen Distribution and Diffusion in Pre-Strained SUS316L through Scanning Kelvin Probe Force Microscopy and Thermal Desorption Spectroscopy

Shuanghe Chi, Jinxing Guo, Zhengli Hua (), Juan Shang and Baihui Xing
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Shuanghe Chi: Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China
Jinxing Guo: Xi’an Aerospace Propulsion Institute, Xi’an 710077, China
Zhengli Hua: Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China
Juan Shang: Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China
Baihui Xing: Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China

Energies, 2023, vol. 16, issue 20, 1-11

Abstract: Austenitic stainless steels (γ-SS) play an important role in the storage of high-pressure hydrogen. However, hydrogen embrittlement (HE) can significantly degrade the mechanical properties of γ-SS. Measuring the distribution of hydrogen in γ-SS is a vital way to learn about HE. In this paper, scanning Kelvin probe force microscopy (SKPFM) and thermal desorption spectroscopy (TDS) have been utilized to analyze the distribution and diffusion of hydrogen in pre-strained SUS316L. Additionally, the McNabb–Foster model is employed to calculate hydrogen in the lattice and phase boundaries along the sample’s thickness direction. The results demonstrate that the combination of SKPFM and TDS is an effective approach for studying hydrogen distribution and diffusion in metals. It was observed that hydrogen segregation occurs at the boundary between the martensitic (α′) and austenite (γ) phases. The inhibitory effect of the oxide film on hydrogen diffusion is more significant at lower temperatures. However, it should be noted that the McNabb–Foster model exhibits relatively high accuracy in predicting hydrogen desorption at higher temperatures while disregarding the influence of the native oxide film.

Keywords: scanning Kelvin probe force microscopy (SKPFM); SUS 316L; thermal desorption spectroscopy (TDS); hydrogen embrittlement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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