Hydrogen transport in solution-treated and pre-strained austenitic stainless steels and its role in hydrogen-enhanced fatigue crack growth |
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| Authors: | Y Mine C Narazaki K Murakami S Matsuoka Y Murakami |
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| Affiliation: | 1. Department of Mechanical Engineering Science, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;2. Research Centre for Hydrogen Industrial Use and Storage (HYDROGENIUS), National Institute of Advanced Industrial Science and Technology (AIST), 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;3. Graduate School of Engineering, Kyushu University, Japan |
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| Abstract: | Hydrogen solubility and diffusion in Type 304, 316L and 310S austenitic stainless steels exposed to high-pressure hydrogen gas has been investigated. The effects of absorbed hydrogen and strain-induced martensite on fatigue crack growth behaviour of the former two steels have also been measured. In the pressure range 10–84 MPa, the hydrogen permeation of the stainless steels could be successfully quantified using Sieverts' law modified by using hydrogen fugacity and Fick's law. For the austenitic stainless steels, hydrogen diffusivity was enhanced with an increase in strain-induced martensite. The introduction of dislocation and other lattice defects by pre-straining increased the hydrogen concentration of the austenite, without affecting diffusivity. It has been shown that the coupled effect of strain-induced martensite and exposure to hydrogen increased the growth rate of fatigue cracks. |
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| Keywords: | Hydrogen Solubility Diffusivity Fatigue crack growth Strain-induced martensitic transformation Austenitic stainless steel |
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