Microstructure Evolution of Gray Cast iron During Austenitizing
In this paper,gray cast iron was treated with different austenitizing and austempering.The microstructure and properties of gray cast iron were analyzed by optical microscope and tensile testing machine.The results show that there was no obvious coarsening of austenite grains and the greatest grain size was about 80 μm in the range of austenitizing temperature 875～950℃and austenitizing time 30～120 min.The presence of graphite affected the carbon concentration in austenite and the mechanical properties after austempering.The properties of gray cast iron can be controlled by adjusting the austenitizing process.
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