ABSTRACT In 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.

中文翻译：

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高铬铸铁/低碳钢双金属中的扩散行为

摘要 在本研究中，三种不同 Cr 含量的高铬铸铁 (HCCIs) 与低碳钢 (LCS) 结合，Cr 含量对 HCCIs 与碳钢之间的结合和原子扩散行为的影响LCS 进行了调查。结果表明，HCCIs和LCS表现出良好的冶金结合，界面完整，没有任何微缺陷。HCCIs 中碳化物的体积分数随着 Cr 含量的增加而增加。碳化物由 M7C3、M23C6 和富钼 M2C 组成；因此，HCCI 的耐磨性得到增强。从能谱分析中发现，由于正化学梯度，C 原子从 HCCI 扩散到 LCS。C原子扩散形成的LCS侧珠光体区的宽度随着Cr含量的增加而逐渐减小，