PSI - Issue 60

Gopal Sanyal et al. / Procedia Structural Integrity 60 (2024) 311–323 Author name / Structural Integrity Procedia 00 (2019) 000–000

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hydrogen embrittlement of this new alloy is not available. Generally, the hydrogen embrittlement is reported in low alloy steels using the cathodic pre-charging. In this work the hydrogen embrittlement is investigated in the new generation alloy using in-situ electrochemical charging. Detailed investigations of its tensile and fracture dataunder in-situ loading condition over a range of applied current densities were undertaken in order to understand fracture response of the alloy under intense hydrogen ingress situation. 2. Experimental Methods The chemical composition (by wt%) of the steel used for the work is C-0.15, V-0.2, Cr-2.9, Mo-0.7, Mn-0.3, Ni 0.7, P-0.01, Cu-0.04 and Fe-balance.Dog-bone shaped tensile specimens conforming to the standard ASTM E8-01 (2001) with gauge length of 20 mm and diameter of 4 mm (Fig. 1) were prepared for tension testing. Additionally, compact tension [C(T)] specimens conforming to the standard ASTM E1820-01 (2001) with W= 25 mm and thickness = 8 mm (Fig. 2) were machined for fracture toughness testing. The C(T) specimens were subjected to cyclic loading in a RUMUL make resonant fatigue tester, prior to fracture toughness testing for generation of a sharp crack ahead of the machined notch tip for obtaining a gross crack length (a 0 /W) of 13 mm or so, translating a normalized crack length, 0.6

2.1. Structure Figure 1 :Drawingof the tensile sample used for HE in-situ experiments on Cr-Mo-V-Ni steel.