Hydrogen distribution and segregation in hydrogen-charged S30408 after fracture analyzed via scanning Kelvin probe force microscopy

Shang, Juan; Hua, Zhengli

doi:10.1016/j.apsusc.2020.147050

Cited by 4 publications

(2 citation statements)

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“…4(f )]. Because these series of potential variation over time cannot be explained in terms of forming the passive oxide film, the present authors hypothesize that the diffusion and segregation of invaded hydrogen from cathodic charging [8] would be reflected in the potential variations. Luppo et al [21] confirmed segregation of invaded hydrogen at the boundaries of δferrite phases on the entry surface of a weld metal for cathodically charged austenite stainless steels by hydrogen microprinting.…”

Section: Resultsmentioning

confidence: 87%

“…Scanning Kelvin probe force microscopy (SKPFM) [5][6][7]] is a powerful tool for mapping the hydrogen distribution in materials; it has a spatial resolution of up to several tens of nanometers and detects surface potential changes that are pertinent to diffusible hydrogen on the metal surface [8,9]. This technique also enables sequential kinetic analysis of the hydrogen distribution with continuous measurements [9].…”

Section: Introductionmentioning

confidence: 99%

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Invasion/Permeation Hydrogen in Cathodic Charged SUS316 Columnar Crystals Evaluated with a Scanning Kelvin Probe Force Microscope

Murase,

Katayama

2024

Mater. Trans.

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The monitoring of invasion/permeation hydrogen on entry/exit surfaces of cathodically charged SUS316 columnar crystals was conducted with a scanning Kelvin probe force microscope (SKPFM) under atmospheric pressure. Columnar crystal specimens covered with oxide films on their surfaces under room conditions were prepared for cathodic charging tests and subsequent SKPFM measurements. The invaded hydrogen on the entry surface was detected at the δ-ferrite phases for 7 d after charging, and the segregation of invaded hydrogen at the boundaries between the δ-ferrite and austenite matrix was prolonged for >10 d after charging. The permeated hydrogen on the exit surface was detected at the δferrite phases for 3 d after charging, but was not substantial at some of the δ-ferrite phases regardless of the charging. Segregation of permeated hydrogen at the boundaries between the δ-ferrite and some of the intermetallic precipitates was prolonged for 7 d after charging. The behaviors of invaded/permeated hydrogen based on heterogeneous microstructures are discussed to improve understanding of the hydrogen embrittlement mechanism in weld metals.

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Section: Resultsmentioning

confidence: 87%