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为了提高铁基合金喷焊层的硬度与耐磨性,在铁基合金粉末中加入不同含量的碳化硼,采取火焰喷焊技术在42CrMo合金钢表面制备四种复合粉末喷焊层,然后用光学显微镜对喷焊层的显微组织进行分析,利用自动转塔显微硬度计、磨粒磨损试验机测定了喷焊层的显微硬度和耐磨性。实验结果表明:铁基喷焊层与基体形成了良好的冶金结合,涂层主要由细小的树枝晶及鱼骨状共晶组织组成;B4C的加入可显著提高喷焊层的硬度和耐磨性,细化组织,随着B4C含量的增加,喷焊层的硬度和耐磨性呈现先增加,后降低的趋势,当B4C含量为2%时,喷焊层的硬度和耐磨性最好。
In order to improve the hardness and wear resistance of iron-based alloy spray coating, different contents of boron carbide were added to the iron-based alloy powder, and four composite powder spray coatings were prepared on the surface of 42CrMo alloy steel by flame spray welding. The microstructure of the sprayed layer was analyzed with a microscope. The microhardness and wear resistance of the sprayed layer were measured by using an automatic turret microhardness tester and an abrasive wear tester. The experimental results show that the iron-based sprayed coating and the substrate form a good metallurgical bond, the coating mainly consists of fine dendrites and fish bone eutectic structure; B4C can significantly improve the hardness and wear resistance of the spray coating , And the microstructure. With the increase of B4C content, the hardness and wear resistance of the sprayed coatings increase at first and then decrease. When the content of B4C is 2%, the hardness and wear resistance of the sprayed coatings are the best.