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This work evaluates the possible correlation between low fracture toughness (critical CTOD) and local brittle zones (LBZ) occurrences in heat affected zone (HAZ) coarse grain regions. The fracture toughness of a welded API 5L X80 steel was characterized using SE(B) specimens for CTOD determination with notches located in the HAZ. The specimen dimensions are thickness B=17mm, width W=34mm, span S=138mm and crack length to width ratio, a/W=0,5. The effects of LBZ are evaluated through tests carried out in temperatures of -40oC, -50oC and -70oC. The critical CTOD values obtained in this work had presented low fracture toughness and these results can be attributed to local brittle zones formed in the welding process.

Determinação experimental da tenacidade à fratura da zona termicamente afetada de junta soldada de aço API 5L X80.