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Quantitative fractographic characteristics of 4340 steel is demonstrated for a grain size range of 10−100µm and hardness range of 41–52 HRC. Double-notched tensile samples were electrochemically charged in-situ with hydrogen in 0.5mH2SO4+5mg/l As2O3 solution for 0–40min charging time. Hydrogen induced fracture initiations were analyzed by novel metallographic investigation of the “unbroken” notch...
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