氩弧原位合成TiC颗粒增强Fe基复合层

In situ formation TiC particles reinforced Fe-based alloy composite coating by GTAW

关键词:  氩弧焊  原位合成  TiC颗粒  Fe基复合层

Key words:  GTAW  in situ formation  TiC particles  Fe-based composite coating

摘要:

通过在Fe基自熔合金粉末中添加一定比率的强碳化物形成元素Ti及石墨,采用氩弧熔敷法在中碳钢基体上制备原位形成的TiC颗粒增强Fe基合金复合涂层。利用扫描电镜、电子探针、X射线衍射和图像分析系统,对熔敷层显微组织及其影响因素进行了观察与分析。研究结果表明,利用氩弧熔敷技术,可以原位形成细小、弥散分布的TiC颗粒;TiC颗粒沿熔敷层深度呈梯度分布。通过调整预置涂层的厚度、熔敷工艺参数以及石墨的加入量,可以调整控制熔敷层的成形及组织与性能。

Abstract:

Using preplaced Fe-based self-flux melting alloy with carbide forming elements Ti as well as graphite,Fe-based alloy composite coating reinforced by in situ TiC particles was produced on the substrate of carbon steel by gas tungsten arc welding(GTAW) process.Microstructure and properties of the coating were investigated by means of SEM,cEPMA,X-ray diffractmeter and analysis system of image.The results show that the fine TiC particles,which distributed in the matrix,can be formed by using GTAW process.TiC particles possess gradient distribution along the depth of the coating.A good formation,microstructure and properties of the composite coating can be obtained by adjusting the preplaced thickness of the coating,welding parameters as well as amount of FeTi and graphite.