Abstract
Hydrogen embrittlement has been investigated on metastable and stable austenitic stainless steels cold-rolled by 0% to about 60%. The specimens were made of Fe-18% Cr-8% Ni (18-8), Fe-25% Cr-19% Ni (25-19) and Fe-24% Cr-13% Ni with 0.3% N (24-13/N); N was added to save the Ni content. The bend test was used to evaluate the hydrogen embrittlement, and the number of bending before failure was measured for H-free and H-charged specimens (N: H-free, NH: H-charged). The main results are as follows:(1) The number of bending before failure decreased with increasing H-charging. For specimens with the same Vickers hardness, NH was in the order of 24-13/N>18-8>25-19.(2) The ratio of hydrogen embrittlement [RH=(N-NH)/N] was in the order of 18-8>24-13/N>25-19. For 18-8, RH increased with increasing Vickers hardness. For 25-19 and 24-13/N, however, RH decreased with increasing Vickers hardness and RH for 25-19 was smaller than that for 24-13/N.(3) The thickness of the hydrogen embrittlement layer in 18-8 increased with increasing cold-reduction but those of 25-19 and 24-13N did not change.(4) H-charging produced surface cracks on solution-treated specimens and less cracks on cold-rolled specimens: blisters were most noticeable on cold-rolled 18-8. The surface change due to H-charging was more marked on 25-19 than on 24-13/N.(5) For 25-19 and 24-13/N, hydrogen-induced e-martensite content decreased with increasing cold-reduction. The e-martensite content of 25-19 was larger than that of 24-13/N.
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