论文部分内容阅读
以Al和TiC的混合粉末为原材料对20#钢进行激光表面合金化,制备了TiC增强Fe3Al金属间化合物基体复合涂层。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)等方法分析了涂层的相组成及显微组织结构,通过热力学计算确定了TiC的溶解热力学条件,并探讨了TiC的溶解及析出规律。结果表明:涂层主要组成相为Fe3Al和TiC;激光表面合金化过程中,当温度达到2000K~2200K时,作为粉末原材料的TiC颗粒在Fe-Al合金熔体中开始发生溶解,然后在合金熔池中重新凝固析出,以原位增强颗粒的形式呈网状分布于Fe3Al金属间化合物基体上。
The 20 # steel was laser surface alloying with Al and TiC mixed powders as raw materials to prepare TiC-reinforced Fe3Al intermetallic compound matrix composite coating. The phase composition and microstructure of the coating were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The thermodynamic calculation was used to determine the solution thermodynamic conditions of TiC. TiC dissolution and precipitation rules. The results show that the main phases of the coating are Fe3Al and TiC. During the laser alloying process, when the temperature reaches 2000K ~ 2200K, the TiC particles, which are the raw materials of powder, begin to dissolve in the Fe-Al alloy melt, Pool re-solidification precipitation, in situ enhanced particle form was reticular distribution in the Fe3Al intermetallic matrix.