Abstract
ABSTRACTIn the present study, three high-chromium cast irons (HCCIs) with different Cr-content were bonded to low-carbon steel (LCS) and the effects of the Cr-content on the bonding and atomic diffusion behaviour between the HCCIs and the LCS investigated. The results show that the HCCIs and LCS showed good metallurgical bond with intact interfaces, without any micro-defects. The volume fraction of carbides in HCCIs increased with an increase of Cr-content. The carbides consist of M7C3, M23C6 and Mo-rich M2C; accordingly, the wear resistance of the HCCIs was enhanced. From an energy spectrum analysis, it was found that C atoms diffused from the HCCIs to the LCS owing to a positive chemical gradient. The width of the pearlite zone on the LCS side, which formed by the diffusion of C atoms, gradually decreased with the Cr-content, thus leading to a decrease in the shear strength of the bimetals.
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