# Study on the Properties of Multi-Layer Cumulative Rolling-Prepared High-Chromium Cast Iron Powder/Low-Carbon Steel Composites

## TL;DR

This study explores how to make high-chromium cast iron and low-carbon steel composites using hot rolling, finding that rolling at 1150°C gives the best mechanical performance.

## Contribution

The study introduces a low-cost, feasible method for producing wear-resistant composites using hot rolling of coarse powder.

## Key findings

- Multi-pass hot rolling successfully fabricates HCCI powder/LCS composites with metallurgical bonding.
- Tensile strength peaks at 810 MPa at 1150°C, with brittle fracture observed in HCCI layers.
- Hot rolling at 1150°C provides optimal mechanical properties and interfacial bonding.

## Abstract

What are the main findings?
Multi-pass hot rolling (with a total thickness reduction of 70%) was successfully employed to fabricate high-chromium cast iron (HCCI) powder/low-carbon steel multilayer composites.The tensile strength exhibited a non-monotonic variation with temperature, peaking at approximately 810 MPa at 1150 °C. The composite showed very limited macroscopic plasticity and underwent brittle fracture, with cracks initiating in the HCCI layer.A rolling temperature of 1150 °C was identified as optimal, offering the best combination of mechanical properties and interfacial bonding.

Multi-pass hot rolling (with a total thickness reduction of 70%) was successfully employed to fabricate high-chromium cast iron (HCCI) powder/low-carbon steel multilayer composites.

The tensile strength exhibited a non-monotonic variation with temperature, peaking at approximately 810 MPa at 1150 °C. The composite showed very limited macroscopic plasticity and underwent brittle fracture, with cracks initiating in the HCCI layer.

A rolling temperature of 1150 °C was identified as optimal, offering the best combination of mechanical properties and interfacial bonding.

What are the implications of the main findings?
This work provides benchmark parameters for the development of similar bimetallic wear-resistant composites.The study demonstrates a low-cost and feasible route for producing wear-resistant composites via hot rolling of coarse powder.It also offers a valuable research paradigm for the study of other powder metallurgy-based laminated composites.

This work provides benchmark parameters for the development of similar bimetallic wear-resistant composites.

The study demonstrates a low-cost and feasible route for producing wear-resistant composites via hot rolling of coarse powder.

It also offers a valuable research paradigm for the study of other powder metallurgy-based laminated composites.

Multilayer laminated composites consisting of high-chromium cast iron (HCCI) powder clad with low-carbon steel (LCS) were fabricated via multi-pass hot rolling at a deformation of 70% under three different temperatures: 1100 °C, 1150 °C, and 1200 °C. The microstructure, elemental diffusion, and mechanical properties of the samples processed at these temperatures were systematically investigated. The results indicate that effective metallurgical bonding was achieved between the HCCI powder and the LCS matrix, with the HCCI regions accumulating high strain energy and dislocation density. Hardness testing demonstrated that higher rolling temperatures lead to increased hardness. The dominant wear mechanism was identified as dry sliding wear. The relatively low content of retained austenite contributed to a reduction in tensile strength, while this microstructure further promoted abrasive wear through the spalling of carbides. These findings suggest that hot processing offers a feasible pathway for improving the wear resistance of HCCI-based composites.