【摘要】 利用热模拟单道次压缩实验研究了45#钢在不同温度变形过程中微观组织的演变规律。通过对变形过程中组织形貌的观察和应力-应变曲线的分析，讨论了变形过程中的相变行为和软化过程。结果显示，实验钢在热变形过程发生铁素体(DIF)和珠光体(DIP)两种形变诱导相变，Ar3温度以上变形时，主要发生形变诱导铁素体相变，伴随少量珠光体生成，并且随着变形温度的降低铁素体增加，珠光体略微降低；Ar3温度以下变形时，形变诱导珠光体逐渐取代铁素体，且随温度的变化趋势相反。低温变形时，形变诱导相变是软化的主要原因，高温变形时主要发生动态再结晶，导致软化，并且动态再结晶的软化作用要比形变诱导相变的好。更多还原

【Abstract】 The microstructure evolution of 45# steel during deformation at different temperatures was studied by single pass compression experiments. Based on the observation of the microstructure and the analysis of the stress-strain curve, the transformation behavior and softening process in the deformation process are discussed. The results show that there are two kinds of deformation-induced ferrite(DIF) and pearlite(DIP) transformations in the thermal deformation process of the experimental steel. When the Ar3 temperature is above, the deformation mainly occurs deformation-induced ferrite transformation, accompanied by a small amount of pearlite formation. With the decrease of deformation temperature, the ferrite increases, and the pearlite decreases slightly. When Ar3 deforms below temperature, the deformation induces pearlite to replace ferrite gradually, and the change trend is opposite with temperature. At low temperature, deformation-induced phase transformation is the main reason for softening, while at high temperature, dynamic recrystallization occurs mainly, leading to softening, and the softening effect of dynamic recrystallization is better than that of deformation-induced phase transformation.更多还原