Investigation on the isothermal spheroidizing of carbides in the hot deformed white cast iron

The spheroidizing behaviors of carbides formed from detormation at high temperature in white cast iron had been studied during isothermal spheroidizing process, the results showed that the carbides grown under the way that the bigger carbide particles merged the smaller ones or short-bar-like carbide separated and the bar ends resolved to spheroidize itself. The carbide size increased as its number decreased gradually, the growth speed of shperical carbide could be expressed by the experimental equation: V over-bar r = 1.2675×10-3/(0.325+0.0064τ)2 (μm/min).