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本文用膨胀法和金相法研究了亚共析合金钢40Cr 铁素体和珠光体转变动力学。提出用碳当量计算 A_1～A_3温度之间亚共析合金钢铁素体转变动力学公式。测出了 A_1温度以下的拐点温度,在拐点温度以下,铁素体和珠光体转变符合 Johnson—Mehl 公式。并且讨论了在拐点温度至 A_1温度之间,铁素体和珠光体转变的动力学公式。
In this paper, the kinetics of 40Cr ferrite and pearlite transformation in sub-eutectoid steels was studied by means of swelling and metallography. The kinetic formula of ferrite transformation between sub-eutectoid steel and A_1 ~ A_3 is proposed using carbon equivalent. The temperature of the inflection point below the A_1 temperature was measured. Below the inflection point temperature, the ferrite and pearlite transitions were in accordance with the Johnson-Mehl formula. The kinetic formulas for the transformation of ferrite and pearlite between the inflection point temperature and A_1 temperature are also discussed.