利用光学显微镜和晶体长大动力学理论对低碳微合金钢中晶内和晶界 铁素体的长大动力学进行了实验测定和理论计算与分析. 在实验温度范围 (650-750 ℃)内, 铁素体首先在晶界上形成, 在晶内夹杂物上形成较晚. 晶 界与晶内铁素体形成的过冷度相差40 ℃以上, 铁素体在晶内夹杂物上形成比在 晶界上形成需要更大的过冷度. 晶内铁素体长大速率常数的实测值小于计算值, 晶界铁素体长大速率常数的实测值则大于计算值.
The growth kinetics of ferrite formed at intragranular inclusions and austenite grain boundaries in a low carbon microalloyed steel were analyzed by optical observation and theoretical calculation. The formation of intragranular ferrite on inclusions was later than that of ferrite allotriomorphs at austenite grain boundaries within the temperature range of 650-750℃. The undercooling for the formation of ferrite on inclusions is 40℃ larger than that at austenite grain boundaries. For the former the measured growth rate constant was smaller than that calculated, and for the latter the measured growth rate constant was larger than that calculated.
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