Effects of tungsten on the hydrogen embrittlement behaviour of microalloyed steels |
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| Affiliation: | 1. Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, South Korea;2. Surface Technology Research Group, POSCO, Gwangyang, 545-875, South Korea;3. Light Metal Division, Korea Institute of Materials Science, Changwon, 642-831, South Korea |
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| Abstract: | The effects of tungsten (W) additions (0, 0.1, 0.5 and 1 wt.%) on the hydrogen embrittlement behaviour of microalloyed steels were systematically investigated by means of slow strain rate tests on circumferentially notched cylindrical specimens, and the mechanism of hydrogen-induced embrittlement was discussed. W addition is found to increase the activation energy of hydrogen desorption. Microstructural features affect the hydrogen embrittlement behaviour and fracture modes of microalloyed steels. It is suggested that the hydrogen-induced embrittlement in the studied microalloyed steels with different W additions is caused by the combined effects of decohesion and internal pressure in the presence of hydrogen. |
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| Keywords: | A. Low alloy steel B. Hydrogen permeation C. Hydrogen absorption C. Hydrogen embrittlement |
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