Abstract
The effect of the microstructure on the hydrogen embrittlement susceptibility, hydrogen mobility and hydrogen distribution in a low carbon steel was studied by means of the electrochemical permeation method (electrochemical and gas charging), mechanical tests and hydrogen microprint technique. The hydrogen diffusivity attains a minimum value in a fresh martensite and diffusivity increases with increasing tempering temperature. The quantity of desorbed hydrogen is at a maximum for a fresh martensite and decreases with increasing tempering temperature. The trapping energy was estimated to be ∼ 46 kJ mol −1. There is a direct relationship between hydrogen embrittlement susceptibility and the quantity of desorbed hydrogen as well as between the hydrogen segregation and crack location. The steady state flux is maximum for a normalized state. These facts can be explained in terms of hydrogen trapping process.
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