Fabrication of a Composite Material of High‐Chromium Cast Iron Dispersed in Low‐Carbon Steel by Hot‐Rolling Process

Abstract

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.

Study on Wear Resistance Performance along the Thickness Direction of In Situ TiC‐Reinforced High‐Strength Steel

“…The protruding TiC particles in TiC steel could effectively protect the matrix from wearing by hard abrasive particles. [47,48] The matrix provided a good support for TiC particles and prevented the early peeling of the reinforcing particles, thereby ensuring the wear resistance performance of the reinforced steel. Because of the strong bonding force between TiC and the matrix, the larger TiC particles were likely to provide better protection to the matrix, as shown from the area highlighted by the yellow box in Figure 11a,b.…”