Abstract (Ti,Mo)B2-(Ti,Mo)C-(Fe,Cr)7C3 particle-reinforced laser cladding coatings with different contents of Y2O3 were prepared on a hot forging die steel substrate. The microstructure and wear behaviors were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), block-on-ring room temperature wear testing, and ball-on-disc high-temperature wear testing. The results showed that rectangular-like (Ti,Mo)B2, flower-like (Ti,Mo)C, and granular-like (Ti,Mo)C particles were formed in situ during laser cladding processing. Crack-free coatings with a relatively smooth appearance were obtained with the addition of less than 2 wt% Y2O3. The microhardness of the coatings was improved by adding Y2O3. Among all cladding coatings, the coating with 2 wt% Y2O3 had the highest wear resistance and possessed excellent resistance to ploughing wear and plastic deformation. The dominant wear mechanism of the coatings was adhesive wear. The high-temperature wear resistance of the coating with 2 wt% Y2O3 was about 1.86 and 26.5 times of that of the coating without Y2O3 and substrate, respectively.

中文翻译：

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稀土氧化物对原位合成陶瓷增强铁基激光熔覆涂层组织和磨损性能的影响

摘要 在热锻模具钢基体上制备了不同Y2O3含量的(Ti,Mo)B2-(Ti,Mo)C-(Fe,Cr)7C3颗粒增强激光熔覆涂层。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、块对环室温磨损试验和球对盘高温磨损试验研究了显微组织和磨损行为。结果表明，在激光熔覆加工过程中，原位形成了矩形状(Ti,Mo)B2、花状(Ti,Mo)C和粒状(Ti,Mo)C颗粒。添加小于 2 wt% 的 Y2O3 即可获得外观相对光滑的无裂纹涂层。添加Y2O3提高了涂层的显微硬度。在所有覆层涂料中，含 2 wt% Y2O3 的涂层具有最高的耐磨性，并具有优异的抗犁刀磨损和抗塑性变形能力。涂层的主要磨损机制是粘着磨损。含 2 wt% Y2O3 涂层的高温耐磨性分别是不含 Y2O3 和基体的涂层的 1.86 倍和 26.5 倍。