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Effect of nano Nb and V carbides on the hydrogen interaction in tempered martensitic steels

2021; Elsevier BV; Volume: 47; Issue: 2 Linguagem: Inglês

10.1016/j.ijhydene.2021.10.051

1879-3487

Tatiane Augusta Almeida dos Santos, Marília Mendonça de Lima, D.S. dos Santos, Vicente Tadeu Lopes Buono,

Microstructure and Mechanical Properties of Steels

The effect of precipitate type and distribution to mitigate the hydrogen embrittlement of high strength martensitic steels containing different levels of C, Nb, and V was studied. Even low additions of Nb and V contributed to an increase of the material resistance. The steel with a more homogeneous distribution of carbides, higher Nb, and lower V showed increased hydrogen solubility and presented a lower level of loss of ductility in tensile tests with hydrogen pre-charging. The presence of segregation of precipitates was responsible for a rise in the amount of diffusible hydrogen, thus increasing the hydrogen embrittlement susceptibility.