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| STUDY OF HYDROGEN EMBRITLLEMENT IN Fe-Ni BASED ALLOY THROUGH POSITRON ANNIHILATION LIFETIME TEST |
| Jian Zhang; |
| 中科院金属研究所特殊环境材料研究室 |
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Cite this article:
Jian Zhang. STUDY OF HYDROGEN EMBRITLLEMENT IN Fe-Ni BASED ALLOY THROUGH POSITRON ANNIHILATION LIFETIME TEST. Acta Metall Sin, 2006, 42(5): 469-473 .
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Abstract Positron annihilation lifetime and SEM were used to study the change of internal defects before and after hydrogen charging in a Fe-Ni based precipitation strengthened austenitic stainless steel which was heat-treated under different conditions. Positron annihilation lifetime spectrum was fitted in terms of two lifetime components. Both positron annihilation lifetime and tensile tests at room temperature indicate that solution treated alloy has a very little grain-boundary carbide and hydrogen charging will increase its strength while decrease its plasticity. Peak aging will produce more grain-boundary carbide and the phase is in the size below 20nm，but is coherent with the matrix. After hydrogen charging, hydrogen will not enter the - interface，but the grain boundary and inter-grain vacancy clusters resulting in a obvious drop of plasticity, over-aging will induce much more interconnected grain-boundary carbide and will coarse in a size of more than 70nm. As a result, hydrogen will enter the grain boundary and - interface with dislocation, which leads to the dramatic drop of plasticity.
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Received: 12 August 2005
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