论文部分内容阅读
热轧TRIP钢具有优异的力学性能,热轧生产后经过酸洗处理可以直接用于汽车制造。采用Gleeble3500型热模拟试验机研究了C-Si-Mn-Nb系热轧TRIP钢形变奥氏体在不同连续冷却条件下的组织变化情况,绘制了动态CCT曲线。通过研究不同冷速下试样组织发现,冷却速率越大,组织中未转变奥氏体含量越低。最后,依据对动态CCT曲线的分析在Gleeble3500型热模拟试验机上模拟热轧了TRIP钢。结果表明:实验钢轧后以15℃/s的低冷却速率冷却至贝氏体区等温后,残留奥氏体的含量和稳定性更高,TRIP钢力学性能优异,抗拉强度和伸长率分别达到952 MPa和30%,强塑积高达28560 MPa·%。
Hot-rolled TRIP steels have excellent mechanical properties. After hot-rolled production, they can be directly used in automobile manufacturing after pickling treatment. The Gleeble3500 thermal simulation test machine was used to study the microstructure change of C-Si-Mn-Nb hot-rolled TRIP steel deformed austenite under different continuous cooling conditions and the dynamic CCT curve was drawn. By studying the microstructure at different cooling rates, it is found that the greater the cooling rate, the lower the content of untransformed austenite in the structure. Finally, based on the analysis of the dynamic CCT curve, hot-rolled TRIP steels were simulated on a Gleeble Model 3500 thermal simulation machine. The results show that the content and stability of retained austenite after the steel is cooled to 15 ℃ / s cooling rate to bainite isothermal, the mechanical properties of TRIP steel are excellent, and the tensile strength and elongation are respectively Reached 952 MPa and 30%, strong plastic product up to 28560 MPa ·%.