Austenite Grain Growth Behavior of High-chromium Hypereutectoid Steel

Austenite grain growth behavior of the high-chromium hypereutectoid steel at various elevated temperatures and holding times was experimentally researched. Result showed that austenite grain grew in an exponential law with the increase of heating temperatures, which could be well described by the equation: D=2.6×1010 exp (-22×104/RT) when holding at one hour. When holding above three hours and heating with the level of 950,1 050 and 1 200 ℃ respectively, austenite grain expanded in a power law with the increase of holding times, and the higher the temperature was, the faster the grain growth rate was. When heating within the range of 950 ℃to 1 050 ℃, the steel had good anti-coarsen ability at elevated temperatures.