“…The specimens fabricated under different conditions, however, should have different microstructures, and consequently different distributions of hydrogen. Indeed, the present authors have found by tritium radioluminography that distribution of hydrogen in a V-4Cr-4Ti alloy is strongly affected by that of precipitates consisting of Ti, C, N and O [8,9]. Therefore, it is necessary to understand the correlation of microstructure, hydrogen distribution and susceptibility to hydrogen embrittlement.…”