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采用共聚焦激光扫描显微镜对微合金钢铸坯冷装和热送热装过程不同热履历条件进行了试验模拟,对试验全过程中显微组织演变进行了原位观察,并采用光学显微镜观察了试样的室温组织和相变前奥氏体晶粒尺寸。结果表明:冷却相变过程中观察面出现表面浮凸;再加热前,模拟冷装试样已全部完成奥氏体向铁素体及渗碳体转变,而模拟热送热装试样仅发生部分奥氏体分解,原奥氏体形貌仍有所留存;重新加热及再次降温过程中,模拟冷装和模拟热送热装试样显微组织演变特征和最终组织也有所不同;模拟热装试样室温显微组织和相变前奥氏体晶粒均较模拟冷装试样粗大。
The confocal laser scanning microscopy was used to simulate the thermal history of the microalloyed steel slab during cold loading and hot sending. The microstructure evolution of the microalloyed steel was observed in situ and observed with optical microscope Sample room temperature and austenite grain size prior to phase transformation. The results show that surface relief appears on the observation surface during the cooling phase transformation. Before reheating, the simulated cold-rolled specimens have all completed the transformation from austenite to ferrite and cementite, Part of the austenite decomposition, the original austenite morphology still retained; reheating and re-cooling process, the simulation of cold and hot heat transfer test samples microstructure evolution characteristics and the final organization is also different; simulated heat At room temperature, the microstructure and the austenite grains before the phase transformation were all coarser than the simulated cold-rolled specimens.