Science· 2020Q1
Observation of hydrogen trapping at dislocations, grain boundaries, and precipitates
- 596citations
- Q1SCImago
- 2020year
Short summary
Cryo-transfer atom probe tomography directly observed hydrogen atoms at specific microstructural features like dislocations and grain boundaries in high-strength steel, validating embrittlement models.
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Key points
- Directly observed hydrogen atoms at dislocations and grain boundaries in steel.
- Identified incoherent niobium carbide interfaces as hydrogen trapping sites.
- Validated existing models of hydrogen embrittlement mechanisms.
- Enables the design of steels more resistant to hydrogen embrittlement.
AI-generated from the title and abstract; the full text is not read.
Abstract
Hydrogen embrittlement of high-strength steel is an obstacle for using these steels in sustainable energy production. Hydrogen embrittlement involves hydrogen-defect interactions at multiple-length scales. However, the challenge of measuring the precise location of hydrogen atoms limits our understanding. Thermal desorption spectroscopy can identify hydrogen retention or trapping, but data cannot be easily linked to the relative contributions of different microstructural features. We used cryo-transfer atom probe tomography to observe hydrogen at specific microstructural features in steels. Direct observation of hydrogen at carbon-rich dislocations and grain boundaries provides validation for embrittlement models. Hydrogen observed at an incoherent interface between niobium carbides and the surrounding steel provides direct evidence that these incoherent boundaries can act as trapping sites. This information is vital for designing embrittlement-resistant steels.
The authors' abstract, as published at the source. Science, 2020 · DOI ↗
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Field: Metals and Alloys
Metals and AlloysMaterials Science