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The effect of prior austenite grain size on hydrogen embrittlement of Co-containing 18Ni 300 maraging steel

2019; Elsevier BV; Volume: 44; Issue: 33 Linguagem: Inglês

10.1016/j.ijhydene.2019.05.074

1879-3487

Marcelo José Gomes da Silva, Jorge Luiz Cardoso, Dayane S. Carvalho, L. P. M. Santos, Luís Flávio Gaspar Herculano, Hamilton Ferreira Gomes de Abreu, Juan Manuel Pardal,

Welding Techniques and Residual Stresses

The effects of the prior austenite grain sizes in hydrogen embrittlement of Co-containing 18Ni 300 maraging steel were studied employing Slow Strain Rate Testing (SSRT) in 0.6 M NaCl electrolyte under simultaneuos cathodic polarization. The material was susceptible to hydrogen embrittlement in all investigated conditions. In addition, the examination of the fractured surface revealed that the presence of hydrogen in steel promotes the formation of quasi-cleavage regions and hydrogen-induced cracks along the grain boundaries. However, the refining of the prior austenite grain allowed an improvement in the HE resistance. Moreover, EBSD analysis showed that intergranular cracks propagated along to grain boundaries orientated to {001} planes parallel to normal direction, whereas they were deflected on {101} and {111} crystallographic planes.