The effect of prior austenite grain size on hydrogen embrittlement of Cocontaining 18Ni 300 maraging steel

• Autor(a) principal: Silva, Marcelo José Gomes da
• Data de Publicação: 2019
• Outros Autores: Cardoso, Jorge Luiz, Carvalho, Dayane de Sousa, Santos, Luis Paulo Mourão dos, Herculano, Luís Flávio Gaspar, Abreu, Hamilton Ferreira Gomes de, Pardal, Juan Manuel
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: https://doi.org/10.1016/j.ijhydene.2019.05.074; http://www.repositorio.ufc.br/handle/riufc/63857
• topic: Maraging steel; Hydrogen embrittlement; Prior austenite; Grain sizes; Hydrogen-induced cracking

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.