低碳中锰热轧TRIP钢退火工艺及组织演变

Annealing processing parameters and microstructure evolution of hot-rolled low-carbon medium-manganese TRIP steels

摘要: 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.

Abstract: The effects of annealing processing on the mechanical properties and microstructure evolution of high strength and high ductility TRIP steels were investigated.The hot-rolled-and-annealed TRIP steel has remarkable strength and ductility due to the prior martensitic microstructure obtained in the as-hot-rolled condition and the retained austenite formed during intercritical annealing.The results show that the test steels have a tensile strength of over 1 000 MPa and an elongation of over 30%,and the product of ultimate tensile strength and total elongation exceeds 30 GPa·%.The mechanical properties are significantly influenced by intercritical annealing temperature and soaking time.When the TRIP steel is treated at an intercritical annealing temperature of 630℃ for 18h,the best mechanical properties are obtained.