论文部分内容阅读
以Ti O2、铁基粉及N2为原料,采用YAG固体脉冲激光器对预置层进行激光合金化试验,在45钢表面原位生成了TiN陶瓷相增强基体复合合金层。通过金相显微镜和扫描电镜、X射线衍射仪、EDS能谱分析、显微硬度计和摩擦磨损仪分别对合金层的结构、组织及性能进行了分析。结果表明,合金层与基体呈冶金结合,熔化区没有出现裂纹和气孔等缺陷,其物相组织成分主要由FeCr固溶体、TiN和Ti O2组成,并弥散分布在合金层中,合金化层的最大显微硬度可达973 HV0.1,摩擦因数约为0.35,低于基体,耐磨性有明显提高。
TiAl, Fe-based powder and N2 were used as raw materials, and YAG solid-state pulsed laser was used to carry out laser alloying test on the preset layer. TiN ceramic phase reinforced matrix composite alloy layer was formed on the surface of 45 steel in situ. The structure, microstructure and properties of the alloy layer were analyzed by optical microscopy, scanning electron microscopy, X-ray diffraction, EDS, microhardness tester and tribometer respectively. The results show that the alloy layer is metallurgically bonded to the substrate without any defects such as cracks and pores in the melt zone. The microstructure and composition of the alloy are mainly composed of FeCr solid solution, TiN and Ti O2 dispersedly distributed in the alloy layer and the maximum of alloying layer Microhardness up to 973 HV0.1, the friction coefficient of about 0.35, lower than the substrate, wear resistance improved significantly.