Abstract
Hydrogen embrittlement of steel has been investigated both by tensile test and internal friction technique.Hydrogen was charged in specimens by cathodically electric method and high temperature method. High temperature method charged hydrogen in the specimens at γ-phase (950°C) and trapped within by following water quenching. And immediately after chargings, specimens were aged at various time intervals and measured the change in notch-tensile-strength at each aging time by tensile test.Hydrogen cold-work-peak height was measured at various aging levels.N.T.S. of materials decreases with increasing aging time, goes through its minimum and recovers to the value of the hydrogen-free materials.Hydrogen cold-work-peak height increases with increasing aging time, goes through its maximum and peak vanishes by long enough aging.Parallelism was found between the drop in toughness and the hydrogen cold-work-peak height. Further, there exists a linear relatioship between the two.
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