Avaliação da tenacidade à fratura de soldas de alta resistência e baixa liga pelo método da integral-J. / Evaluation of high strength low alloy steel weld metal fracture toughness using the J-integral method.

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

The influence of the microstructure on the fracture toughness behaviour of two groups of multipass High Strength Low Alloy (HSLA) steel weld metals, presenting different microstructure composition, was evaluated. The weld metals A1/A2 exhibited a microstructure composed by acicular ferrite, allotriomorphic ferrite, Widmanstätten ferrite and microphases, and the weld metals B1/B2 presented a microstructure composed by bainite, low carbon martensite and microphases. The fracture toughness evaluation was carried out using J-integral and CTOD concepts and the elastic compliance technique in both SE[B] and CT testpieces. The fracture toughness values for both groups of welds and testpiece geometry were determined and compared. The weld metals microstructures and fracture surfaces analysis were performed using optical and scanning electronic microscope techniques, to correlate the determined fracture toughness values, with the local microstructure around the fatigue crack tip. It was verified that the weld metals A1/A2 exhibited fracture toughness values superior to the ones obtained from weld metals B1/B2.

ASSUNTO(S)

fracture toughness integral-j soldas arbl tenacidade à fratura j-integral elastic compliance technique hsla weld metals variação da flexibilidade elástica

ACESSO AO ARTIGO

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