00Cr13Ni5Mo钢加热及冷却过程的相变原位观察及相关研究

In Situ Observation and Related Research on Phase Transformation During Heating and Cooling Process of 00Cr13Ni5Mo Steel

利用共焦激光扫描显微镜对00Cr13Ni5Mo钢在100K/min升温速率和200K/min降温速率下的相变过程进行了原位动态研究.利用背散射电子衍射测试系统分析了冷却后室温马氏体的晶体学特征.探讨了组织遗传的产生原因.结果表明:00Cr13Ni5Mo钢以100K/min快速加热到1 250℃时,奥氏体完全恢复初始显微形貌,具有组织遗传性,且没有发生自发再结晶;该钢连续冷却过程中形成板条马氏体,马氏体相变起始温度约为273℃;冷却过程中马氏体的相变量随降温时马氏体成批次的增加而增加.

The phase transformation behaviors of 00Crl3NiSMo steel were studied in heating rate of 100 K/min and a cooling rate of 200 K/min by using a confocal laser situ respectively at a scanning microscope, while the crystallographic features of martensite were analyzed at room temperature after the cooling process by electron backscatter diffraction （EBSD）. The mechnism of austenite memory was discussed. Results indicate that, acicular austenite would lead preferably to the recovery ot7 the initial mierostructure and exhibit austenite memory when heated to 1 250 ~C at the heating rate of 100 K/min, where austenitic spontaneous recrystallization would not be observed. 1.ath martensite would be formed in the continuous cooling process as the temperature reach about 273 ~C. The increase of the amount of transformation- induced martensite in the cooling process mainly depends on the rise of batches of martensite.