To obtain a compatible material with good wear resistance (WR) and toughness, a composite material with high-chromium cast iron (HCCI) dispersed in low-carbon steel (LCS) is prepared through multilayer hot rolling. The microstructure and mechanical properties of the composite are investigated. The macrostructure of the composite material reveals that the HCCI layers are necked, fractured, and dispersed in LCS after hot rolling. The two materials combine well without unconnected areas and macrovoids on the interface; however, broken oxides are observed at the interface. Decarburization occurs at the LCS side near the interface and a 15−20 μm-wide ferrite zone is formed at the LCS side. Fe, Cr, Mn, and C elements diffuse at the interface. A pearlite band is formed at the interface, and the thickness of the diffusion is about 2−4 μm. Due to the addition of ductile LCS, the impact toughness of the composite material is about 2.5 times higher than that of the as-cast HCCI, whereas the WR of the composite material is lower than that of HCCI (about 16%). The dispersed HCCI in the composite produces a shadow effect during the sliding wear, which provides protection and support for LCS.

中文翻译：

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热轧法制备高铬铸铁分散在低碳钢中的复合材料

为了获得具有良好耐磨性（WR）和韧性的相容材料，通过多层热轧制备了高铬铸铁（HCCI）分散在低碳钢（LCS）中的复合材料。研究了复合材料的微观结构和力学性能。复合材料的宏观结构表明，HCCI 层在热轧后颈缩、断裂并分散在 LCS 中。两种材料结合良好，界面无不连通区域和大空隙；然而，在界面处观察到破碎的氧化物。脱碳发生在靠近界面的 LCS 侧，并在 LCS 侧形成 15-20 μm 宽的铁素体区。Fe、Cr、Mn 和 C 元素在界面处扩散。界面处形成珠光体带，扩散厚度约为2-4 μm。由于加入了延性 LCS，复合材料的冲击韧性比铸态 HCCI 高约 2.5 倍，而复合材料的 WR 低于 HCCI（约 16%）。复合材料中分散的HCCI在滑动磨损过程中产生阴影效应，为LCS提供保护和支撑。