Abstract
Several models of fracture in ferritic steel consider matrix strain to be an indicator of the condition required for second-phase particle cracking (i.e. microcrack nucleation). Recent simulations predict that stress × strain (W) is a better supported indicator. This paper examines the effect of replacing strain by W within the EOH fracture model. There is no improvement in the descriptions of fracture toughness and initiation site properties for eight different steels over a range of temperatures. The use of W, however, leads to the convergence of data from different steels, and permits estimates of the particle cracking criterion to be made from metallographic data, when suitable fractographic data are unavailable. Overall, experiment agrees with simulation in finding W a more appropriate parameter to use than strain alone.
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