Abstract
A dual-phase steel containing niobium, vanadium and titanium as microalloying elements was tested for hydrogen embrittlement (HE). The susceptibility to HE was observed to be closely related to the microstructural state. Hydrogenated specimens intercritically annealed at relatively low temperatures to develop martensite islands in a ferrite matrix basically exhibited quasi-cleavage fracture with some ductile dimpling. The mode of fracture in charged specimens quenched from higher intercritical annealing temperatures was predominantly intergranular fracture along prior austenite grain boundaries and cracking of martensite laths. The detrimental role of residual stresses, retained austenite and microalloying carbides in the process of HE is discussed.
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Alp, T., Iskanderani, F.I. & Zahed, A.H. Hydrogen effects in a dual-phase microalloy steel. J Mater Sci 26, 5644–5654 (1991). https://doi.org/10.1007/BF02403969
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DOI: https://doi.org/10.1007/BF02403969