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通过单轴热压缩试验,结合扫描电镜以及X射线衍射技术,研究了动态相变前奥氏体晶粒状态对基于动态相变的热轧Nb-V-Ti微合金化TRIP钢复相组织状态及力学性能的影响.与动态相变前奥氏体晶粒为等轴状条件下相比,动态相变前奥氏体晶粒为拉长状条件下,动态相变得到的铁素体转变量较大,最终复相组织中贝氏体含量较少且团径较小,马氏体含量较少,但对残余奥氏体含量及其含碳量影响不明显.与不含微合金化元素的基于动态相变的热轧TRIP钢相比,Nb-V-Ti微合金化TRIP钢的屈服强度和抗拉强度明显提高,而延伸率有所降低.
Uniaxial hot compression test, scanning electron microscopy and X-ray diffraction were used to study the state of austenite before dynamic transformation. The microstructures of hot-rolled Nb-V-Ti microalloyed TRIP steel based on dynamic phase transformation And mechanical properties.Compared with the case of equiaxed austenite grains before dynamic transformation, the ferrite transformation obtained by the dynamic transformation of austenite grains under the condition of elongated shape before dynamic transformation The amount of bainite in the final composite phase is smaller and the diameter of the group is smaller and the content of martensite is smaller but the content of retained austenite and its carbon content are not obvious.Compared with non-microalloying Compared with hot rolled TRIP steels based on dynamic phase transitions, the yield strength and tensile strength of Nb-V-Ti microalloyed TRIP steels significantly increase, while the elongation decreases.