中文摘要：

研究了热镀锌用高强TRIP钢的退火工艺对性能的影响和组织演变规律.结果表明：实验用钢可获得780.00MPa以上的抗拉强度和24.00%以上的断后延伸率;两相区加热温度和贝氏体保温时间对钢的力学性能具有显著影响,两相区加热温度为850℃,贝氏体保温时间为30s时,实验用钢能获得最佳的综合力学性能;在贝氏体中温相变后,仍有部分亚稳奥氏体（碳含量较低）在后续冷却过程中发生马氏体相变,从而导致钢退火后的微观组织由铁素体、贝氏体、残余奥氏体和马氏体组成.

英文摘要：

The effects of annealing processing on the mechanical properties and microstructure evolution of high strength hot dip galvanizing TRIP steel were investigated.The results show that the tensile strength over 780.00MPa and elongation over 24.00% can be obtained,and the mechanical properties are significantly influenced by intercritical annealing temperature and isothermal bainitic transformation time.When the intercritical annealing temperature is 850℃ and the isothermal bainitic transformation time is 30s,the steel has the best mechanical properties.Partial metastable austenite （with a lower carbon content） remained after bainitic transformation will be transformed into martensite in the later cooling stage.Therefore,the annealing microstructure is composed of ferrite,bainite,retained austenite and martensite.