论文部分内容阅读
采用膨胀法在DIL805热膨胀仪上测定了不同加热温度下实验钢的连续冷却转变(CCT)曲线,通过光学显微镜和扫描电镜分析不同加热温度对CCT曲线和冷却试样显微组织的影响.结果表明:当加热温度由完全奥氏体化温度降低到两相区内较高温度时,CCT曲线中铁素体转变区左移;当加热温度处在两相区范围内时,随着加热温度的降低,铁素体转变被推迟,使得CCT曲线右移;新生铁素体外延生长方式和奥氏体中碳富集程度的差异是导致上述变迁的主要因素.
The continuous cooling transformation (CCT) curves of experimental steel under different heating temperatures were measured by dilatometry on DIL805 dilatometer, and the effects of different heating temperatures on the CCT curves and the microstructure of the cooled specimens were analyzed by light microscopy and scanning electron microscopy. : When the heating temperature decreases from the complete austenitizing temperature to the higher temperature in the two-phase region, the ferrite transformation region shifts to the left in the CCT curve. When the heating temperature is in the two-phase region, as the heating temperature decreases , The ferrite transformation is postponed, making the CCT curve shift to the right. Differences in the epitaxial growth pattern of new born ferrite and carbon enrichment in austenite are the major factors leading to the above-mentioned changes.