Cleavage fracture model for granular bainite in simulated coarse-grained heat-affected zones of high-strength low-alloyed steels

摘要

A model of cleavage fracture in granular bainite was developed. It involves two- dimensional elastic interaction between a main crack and multiple microcracks in- duced by the existence of martensite-austenite(M-A) particles in front of the main crack. A factor of fracture toughness reduction due to the presence of M-A particles (∮(MA)) was introduced to describe the effect of M-A particles on the stress intensity factor at the tip of the main crack.