Abstract
Fractographic behaviors of electrochemically hydrogenated low alloy 4340 steel samples were compared with low temperature (liquid N2) treated samples of same grain sizes and hardnesses. 4340 samples of grain size range of 10-100 μm and hardness range of 41-52 HRC were electrochemically charged with hydrogen in 0.5 M H2SO4 + 5 mg/l As2O3 solution over 0-40 min charging time. Liquid N2 treatment of the samples of same microstructural range was conducted by encapsulating the sample inside an insulating container (thermos) while the temperature (-136oC) of the sample was tracked in-situ during the tensile test. Fracture surfaces of liquid N2 treated samples showed exactly same fractographic characteristics (quasi cleavage) irrespective of the grain sizes and hardnesses while electrochemically hydrogenated samples showed range of fractographic features depending on the grain sizes and hardnesses.
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