Abstract
Hydrogen embrittlement of a directionally solidified (DS) 1Cr18Ni9Ti stainless steel was studied by using a method of hot charging with hydrogen at high pressure (573 K, 10 MPa, 140 h). It has been found that resistance to hydrogen embrittlement of DS steel is better than that of conventional cast steel and wrought steel with the same composition. This was due to the presence of 4.2%–4.3% ferrite distributing directionally through the whole sample. The aligned ferrites can serve as “short-cut” hydrogen diffusive channels. Hydrogen distribution in samples was determined by using ion microprobe analysis and their diffusivities were calculated by using the data from this analysis.
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