International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions
18 Effect of Hydrogen on Fracture Toughness of Low Alloy Steels
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A fracture toughness test under continuous cathodic charging was performed using four kinds of low alloy steels. The reduction in fracture toughness, JIC, was characterized in terms of the effect by the material, hardness and loading rate. The reduction in JIC was significant when a slower loading rate was used and a harder material was used. However, the 3.5NiCrMoV steel showed a relatively lower reduction in JIC compared to the other materials even when the hardness was higher than that of the other materials. The fracture surface changed from dimpled to quasi-cleavage when the reduction in JIC was significant.