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以Nb-V-Ti复合微合金化C-Mn钢为研究对象,采用热模拟试验,分析降温过程中试验钢尺寸变化,确定相变点和微观组织变化。结果表明,无变形时,试验钢在测试速度下均发生贝氏体转变;经变形后且冷却速度较小时,发生珠光体转变,冷却速度较大时发生贝氏转变;形变使试验钢中铁素体相变温度升高,珠光体相变温度降低,而对贝氏体相变温度影响小;试验钢最佳冷却速率为25.0℃/s以下。
Taking the Nb-V-Ti composite microalloyed C-Mn steel as the research object, the thermal simulation test was used to analyze the dimensional changes of the test steel during the cooling process, and to determine the transformation point and the microstructure change. The results show that no deformation, the test steel bainite transformation occurred at the test speed; After the deformation and the cooling rate is small, the pearlite transformation occurs, the cooling rate is greater when the transformation occurs Belleville; deformation of the test steel ferrite The temperature of bulk transformation is increased, the temperature of pearlite transformation is decreased, but the influence on transformation temperature of bainite is small. The optimum cooling rate of test steel is below 25.0 ℃ / s.