This paper presents a procedure for quantifying the probability of cleavage failures in low alloy steels controlled by microme-chanismus of cracking in carbides. It shows how the integral probability of eleavage varies with the stress intensity factor; the temperature, and the deformation characteristics and microstructural parameters of steel. This quantification of the integral probability of eleavage fracture has been applied for predicting the lower bound of eleavage fracture has been applied for predicting the lower bound of the temperature dependence of fracture toughness of Ni-Cr steel, and very good accordance with experimental results was found. Newly, using two ways the local fracture stress and characteristic distance were calculated in dependence on temperature. The proposed procedure represents a foundation for systematic control of microstructural parameters so as to ensure the optimum relation between strength characteristics and fracture toughness of steels.
展开▼
