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研究了第三代高强度高塑性TRIP钢的退火工艺对性能的影响和组织演变规律.热轧后形成的原始马氏体与临界退火时形成的残余奥氏体使TRIP钢具有良好的强度和塑性.结果表明:实验用钢可获得1000MPa以上的抗拉强度和30%以上的断后延伸率,且强塑积>30 GPa.%;退火温度和保温时间对钢的力学性能具有显著影响,热轧TRIP钢临界退火温度为630℃,保温时间18 h时,实验用钢能获得最佳的综合力学性能.
The effect of the annealing process and the microstructure evolution of the third generation TRIP steel with high strength and high plasticity were studied.The primary martensite formed after hot rolling and the residual austenite formed during critical annealing made the TRIP steel have good strength and Plasticity.The results show that the tensile strength of more than 1000MPa and the elongation at break of more than 30% can be obtained for the experimental steel, and the plastic deformation> 30 GPa.%. The annealing temperature and holding time have a significant effect on the mechanical properties of the steel. When the critical annealing temperature of rolled TRIP steel is 630 ℃ and the holding time is 18 h, the experimental steel can obtain the best comprehensive mechanical properties.