Research on local coarse grains on the surface of pure iron CH1T steel
The fundamental reason for the occurrence of pits and pitting defects in pure iron wire during the drawing process is the presence of local coarse grains on its surface.To explore the root cause of local coarse grain formation,a resistance constant tem-perature heating furnace was used to simulate the evolution of pure iron CH1T steel grains under different heating temperatures(900-1 200 ℃)and heating times(60-360 min),and the critical conditions for abnormal grain growth were obtained and con-trolled.The experimental results show that when the heating temperature is below 1 200 ℃,the grain size of pure iron CH1T steel will undergo three stages of rapid decrease,steady decrease,and further decrease with the increase of heating temperature and heating time.When the heating temperature is 1 200 ℃ and the heating time is extended to 360 minutes,local grain refine-ment will occur due to secondary recrystallization.
pure iron CH1T steelheating temperatureheating timelocal coarse grain
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