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采用热膨胀实验测定实验钢不同奥氏体化温度下的CCT曲线,针对CCT曲线图中铁素体和贝氏体相变区域的变化,通过光学显微镜和扫描电镜观察研究奥氏体化温度对试样室温下显微组织的影响。结果表明:奥氏体化温度越低,晶粒越细小;随奥氏体化温度的降低,铁素体和贝氏体相变受激发形核作用的影响其相变区间逐步扩大并左移;珠光体相变和马氏体相变驱动力只受合金元素在初始奥氏体内富集程度的影响,其开始转变点温度随奥氏体化温度的降低而降低。
The thermal expansion test was used to determine the CCT curve of the austenitizing steel under different austenitizing temperatures. According to the changes of the ferrite and bainite transformation regions in the CCT graph, the austenitizing temperature was observed by optical microscope and scanning electron microscope. Effect of microstructure at room temperature. The results show that the lower the austenitizing temperature, the finer the grains. With the decrease of the austenitizing temperature, the phase transitions of ferrite and bainite are gradually enlarged and shifted to the left due to the excited nucleation ; The pearlite transformation and the martensite transformation driving force are only affected by the enrichment of the alloying elements in the initial austenite, and the temperature at the start of transformation decreases with decreasing austenite temperature.