45钢表面激光合金化原位自生TiC增强相

Reinforcement Phase of In-situ Synthesis TiC on 45 Steel Surface Prepared by Laser Surface Alloying

采用CO_2激光器,在45钢表面制备了以原位Ti+C、直接添加Ti C、原位TiO_2+C、原位Ti+V+C等4种不同体系的亚微米级陶瓷材料为原料的高硬度激光合金化涂层。用XRD、SEM分析了不同合金体系下该涂层的相组成、显微组织以及磨损形貌,测试了合金化层的显微硬度和摩擦系数。结果表明:各种涂层中以原位Ti+V+C涂层的综合性能最为良好。与其他合金涂层相比,该涂层生成较多的强化相,硬度得到明显提高,其值达到了748 HV0.2;该合金化层的磨损失重最少,耐磨性优异。

High hardness laser alloying coatings on 45 steel surface with four different systems of in-situ Ti＋C, in-situ TiO2＋C, adding TiC, in-situ Ti＋V＋C were prepared by CO2 laser taking sub-micron ceramics as rare powders, The phase composition, microstructure and wear morphologies of the coatings under different alloying systems were analyzed by XRD and SEM. The microhardness and friction coefficients of the alloying layers were tested. The results show that the comprehensive properties of in-situ Ti＋V＋C coating are the best in all coatings. Compared with other alloy coatings, the coating generates more strengthening phases, and the hardness improves significantly, which can reach 748 HV0.2. The wear mass loss of Ti＋V＋C laser-alloyed layer is the least, So the wear resistance of the coating is outstanding.