Relationship Analysis of Crack Arrest Property and Conventional Mechanical Properties of High Strength Steel

Fifteen troops of crack arrest temperature CAT and tensile strength R_m, nil-ductility transition temperature NDT, ductile-brittle transition temperature ETT₅₀, ductile-brittle transition parameter k and thickness t of high strength plates were analyzed. The relationship formula of CAT and R_m, NDT, Ceq, k and lnkt² was proposed based on the above results:(1) CAT=2.88·NDT-0.002 4·R_m·NDT + 0.138·kt²; (2) CAT=388.5·Ceq-0.21·R_m-0.006·lnkt².