Non-fracture prediction of a C-Mn weld joint in the brittle-to-ductile fracture transition temperature range--part I: Experimental results and numerical study

摘要

This paper evaluates the brittle fracture risk for a C-Mn weld in the upper shelf of the brittle-to-ductile transition: the criterion considered is based on a critical stress σ_(th), with the failure probability related to the volume around the crack where the maximum principal stress exceeds σ_(th). The weld shows a complex microstructure with two types of melted zone. SEM observations showed that the main cleavage sites are located in the coarse grain zone, near an inclusion. In test analyses, the material's heterogeneity in the weld metal is considered to estimate local fields at the weld pass scale.