International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions
13 The Effect of Nano-Sized TiC Precipitates on Hydrogen Embrittlement of Tempered Lath Martensitic Steel
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The effect of nano-sized TiC precipitates on the resistance of high-strength tempered lath martensitic steels to hydrogen embrittlement has been studied. Ti-added steels showed a higher resistance to hydrogen embrittlement than baseline steels when thermally precharged with hydrogen under a pressure of 31 MPa. When precharged in 138 MPa, however, the resistance of these two steels to hydrogen embrittlement was almost the same. The hydrogen charged baseline steels showed a mixed fracture surface of intergranular and “quasi-cleavage.” In contrast, the Ti-added steels revealed a mixed fracture of “quasi-cleavage” and ductile microvoid coalescence with the presence of hydrogen. Nano-sized TiC precipitates trap hydrogen and improve hydrogen embrittlement resistance. With increasing hydrogen concentration, the benefit of hydrogen trapping at TiC precipitates decreases as they become saturated with hydrogen.