Influence of CeO2 on Properties of Laser Cladding Coatings for High Manganese Steel Jaw Surface Strengthening

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Abstract
High manganese steel jaw plates serve as the core structural components of jaw crushers. Subjected to continuous impact and compressive loads during crushing service, they demand superior wear resistance and impact fatigue performance. In this work, laser cladding was employed to fabricate CeO2-reinforced Fe60 composite coatings on ZGMn13 high manganese steel jaw plate substrate. The surface modification effects were systematically investigated in terms of macroscopic structure analysis, hardness property testing, and wear resistance evaluation. Composite coatings with CeO2 mass fractions of 0%, 1%, 2%, and 3% were prepared, and their microstructures and morphologies were characterized by visual inspection, optical microscopy, and scanning electron microscopy. The test results indicate that the dendritic structures became more pronounced with increasing CeO2 content; however, fracture marks occurred when the CeO2 content was below 1%. A Rockwell hardness tester was adopted to measure coating hardness under a load stress of 382.44 MPa, and the results demonstrate that coating hardness presents a positive correlation with CeO2 doping content. Furthermore, pin-on-disc friction and wear tests were conducted on the prepared coatings. The optimized CeO2-modified coating achieved a minimum wear rate of 0.0033 mm3/(N·m), which is 78.6% lower than that of the untreated substrate. This work provides a valuable reference for improving the surface hardness and wear resistance of jaw plates and promotes the engineering application of laser cladding technology in wear-resistant component strengthening.

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