Abstract: The research results show that the coarsening temperature of austenite grains of 23MnNiMoCr54 link-chain steel is 900℃  ,in order to avoid “mix grain phenomena" occured, the opitmum austenitizing temperature of steel is 850 ℃ for 30 min. Austenite grains grow exponentially with the increase of heating temperature from 850 ℃ to 1100℃ for same holding time. The relationship between the average austenite grain size and holding time conforms to Beck model at the same heating temperature,the grain growth index (n) first decreases and then increases with increase of temperature. The austenitic grain growth model  D=2.105 xl0³ t^0.138exp( -5.18 x 10⁴/RT)。 for 23MnNiMoCr54 link-chain steel at 950 ~ 1250 °C is obtained by fitting in Arrhenius formula.

摘要： 研究结果表明:链环钢23MnNiMoCr54奥氏体晶粒的粗化温度为900 ℃,为避免“混晶现象”的发生， 最佳奥氏体化工艺在850℃下保温30 min。在相同保温时间下,奥氏体晶粒随着加热温度在850-1100℃内升高 呈指数关系长大。在相同加热温度下，平均奥氏体晶粒尺寸与保温时间的关系符合Beck模型,晶粒长大指数n随 着加热温度的升高先降低后升高。依据Arrhenius公式拟合得到了链环钢23MnNiMoCr54在950 - 1250℃内的奥氏体晶粒长大模型 D=2. 105 xl0³ t^0.138exp( -5.18 x 10⁴/RT)。