Abstract
In this paper, the laser cladding is created by using Co50 powder and TiC mixture, covering a H13 hot‐working steel substrate. The samples are analyzed by the hardness test, XRD, SEM, and friction test to identify the forming phases, microhardness distribution, and wear‐resistant characteristics. The results indicated that hardness reduces from the coating zone to the substrate, achieving the highest value at the coating zone. Increasing the content of TiC results in improving the coating hardness. The coatings with 10%–20% TiC show high‐quality surface morphology and macrograph. With 30% TiC, the hardness obtains a higher hardness, but the surface appears to crack. The microstructures of the coatings present a well‐mixed and well‐distribution of the TiC particle on the Co matrix. The friction coefficient of H13 steel and Co50 coating reaches the maximum value when the load is 50 N and mostly decreases with the increase in the load. The wear rates of H13 steel and Co50 coatings mainly increase with the increase in the load. The temperature has a greater influence on the friction coefficient of the Co50 coating. However, the temperature has a small effect on the friction coefficient of the 20% TiC coating. The wear resistance of 20% TiC coating is higher than that of H13 steel, Co50 coating, and 10% TiC composite coating. At room temperature, the wear mechanism of the coating is mainly brittle spalling, adhesive wear, and ploughing. At 700°C, the wear mechanism is mostly oxidation wear and fatigue wear. After laser cladding, the service life of the coated surface could be greatly improved. The Co + 20% TiC coating has high hardness and wear resistance.
Highlights
Most machinery failures are caused not by fractures but by wear and damage of friction surfaces in dynamic joints
Surface modification technologies are rapidly developed and applied to create a hard surface while still preserving the flexibility of the substrate. One of those techniques is coating the surface with high hardness and small abrasion coefficient on materials with high flexural strength
Xiao-hong et al and other studies have shown that the H13 hot-work die steel surface after laser cladding Co-based alloy significantly improves the high-temperature hardness and thermal fatigue resistance of the die [16]. is result proves that the surface laser cladding technology can strengthen the mold surface, or the repair of the old mold has broad application prospects
Summary
Most machinery failures are caused not by fractures but by wear and damage of friction surfaces in dynamic joints. Xiao-hong et al and other studies have shown that the H13 hot-work die steel surface after laser cladding Co-based alloy significantly improves the high-temperature hardness and thermal fatigue resistance of the die [16]. The H13 steel base, the surface hardness, and wear resistance of the material have been significantly improved [3]. Pei studied laser cladding TiCp/Ni-based composite wear-resistant coating on the surface of 45 steel. E effects of different TiC contents, loads, rotation speeds, and temperatures on the dry sliding friction and wear properties of TiC particle-reinforced Co-based coatings were studied. Rough analysis of wear morphology, microstructure, and high-temperature dry friction and wear properties, the mechanism of high-temperature friction and wear was discussed to provide a reference for the practical applications
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