Hydrogen Diffusion Mechanism around a Crack Tip in Type 304L Austenite Stainless Steel Considering the Influence of the Volume Expansion of Strain-Induced Martensite Transformation
| Autor: | Liu Yanzhang, Kuang Yanjun, Jianguo Yang, Zhiliang Xiong, Wenjian Zheng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
Materials science Hydrogen Diffusion chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences austenite stainless steel Metastability Volume expansion mental disorders strain-induced martensite transformation General Materials Science Composite material crack tip lcsh:Mining engineering. Metallurgy Austenite hydrogen diffusion Metals and Alloys Fracture mechanics 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Martensite 0210 nano-technology Hydrogen embrittlement |
| Zdroj: | Metals, Vol 9, Iss 9, p 977 (2019) Metals Volume 9 Issue 9 |
| ISSN: | 2075-4701 |
| Popis: | Strain-induced martensite transformation (SIMT) commonly exists around a crack tip of metastable austenite stainless steels. The influence of the volume expansion of the SIMT on the hydrogen diffusion was investigated by hydrogen diffusion modeling around a crack tip in type 304L austenite stainless steel. The volume expansion changed the tensile stress state into pressure stress state at the crack tip, resulting in a large stress gradient along the crack propagation direction. Compared to the analysis without considering the volume expansion effect, this volume expansion further accelerated the hydrogen transport from the inner surface to a critical region ahead of the crack tip, and further increased the maximum value of the hydrogen concentration at the critical position where the strain-induced martensite fraction approximates to 0.1, indicating that the volume expansion of the SIMT further increased the hydrogen embrittlement susceptibility. |
| Databáze: | OpenAIRE |
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