Abstract
The microstructure of Fe3Al/18-8 diffusion bonding joint after heat treatment was analysed by metalloscopy, scanning electron microscopy and X-ray diffraction. The experimental results indicated that the size of grains near the Fe3Al/18-8 diffusion interface was decreased significantly and the microstructure near the interface became homogeneous. The precipitations also became tiny with regular shape and were distributed evenly at the interface region. The microhardness of the Fe3A1/18-8 diffusion bonding joint was decreased and no brittle phase with high microhardness existed near the interface after heat treatment. The suitable parameters of heat treatment were: heating temperature T=800°C, holding time t=30 min, furnace cooling to 700°C then air cooling.
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