Abstract
Purpose of this work is to investigate the effects of pearlite cluster and ferrite on the crack propagation behavior of advanced high strength steels with high silicon and manganese content. To study the internal crack propagation mechanism, a device and a new method were designed to characterize the crack propagation behavior of the test steel conducted with different heat treatments. The crack propagation mechanism was explored from the perspectives of macroscopic morphology, microstructure and crystal characteristics. Crack propagation tests verified the crack resistance was enhanced by the microstructure which could change and prolong crack path. Brittle cementite precipitate at (α-Fe)/(α-Fe) grain boundaries and grain boundary allotriomorphic ferrites have propagation effect on crack, while intragranular polygonal ferrites have suppression effect on crack. The test steel is slowly cooled below the critical ferrite transition temperature, which helps to obtain more intragranular polygonal ferrites and higher fracture toughness.
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