【摘要】 采用不同的热处理工艺对Fe3Al/18-8扩散焊接头进行热处理,利用金相显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)等测试手段对热处理后的组织性能进行了分析。试验结果表明:经过焊后热处理的Fe3Al/18-8扩散焊接头组织更加均匀,扩散过渡区中弥散分布有第二相析出物,合理的焊后热处理工艺为:加热温度800℃、保温时间30min、炉冷至700℃再空冷。热处理后Fe3Al/18-8扩散焊接头的显微硬度降低,没有出现高硬度脆性相。更多还原

【Abstract】 The microstructure of Fe3Al/18-8 diffusion welding joint after heat treatment was analyzed by means of metalloscope, scanning electron microscope (SEM) and X-ray diffraction (XRD). The experimental results indicate that the microstructure of Fe3Al/18-8 diffusion welding joint after heat treatment becomes homogeneous. The microhardness of the Fe3Al/18-8 joint decrease and no undesired brittle phase exists in diffusion transition zone after heat treatment. The suitable parameters of heat treatment are: heating temperature T=800 ℃, holding time t=30 min, furnace cooling to 700 ℃ then air cooling.更多还原