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研究了中国低活化马氏体(CLAM)钢在1223~1313 K范围内不同加热温度和保温时间下的晶粒长大行为。采用Sellers晶粒长大模型对实验数据进行拟合,并分析和验证了模型的准确性。结果表明:在1223~1253 K保温时,晶粒表现为正常长长;在1283 K保温30 min后,晶粒开始出现异常长大现象,这与钢中的MX相高温稳定性有关;当加热温度为1313 K,晶粒长大迅速。晶粒模型的计算结果与实验结果在较低温度(1223~1253 K)的吻合度很好,在较高温度(1283~1313 K)由于MX相的影响则有较大的偏差。
The grain growth behavior of China low activation martensite (CLAM) steel at different heating temperatures and holding time in the range of 1223-1313 K was studied. The experimental data were fitted by using Sellers grain growth model, and the accuracy of the model was analyzed and verified. The results show that the grain grows normally long when incubated at 1223 ~ 1253 K, and the grain begins to abnormally grow after holding at 1283 K for 30 min, which is related to the high temperature stability of MX in steel. When heated The temperature is 1313 K, the grains grow rapidly. The calculated results of the grain model are in good agreement with the experimental results at lower temperature (1223 ~ 1253 K), but at the higher temperature (1283 ~ 1313 K) due to the influence of MX phase.