中文摘要：

研究了快速加热连续退火工艺对V微合金化低Si含P系TRIP钢显微组织特征与力学性能的影响.结果表明,快速连续退火过程中,随着退火温度的升高,拉伸强度增加明显,然而为了保证其综合性能,并不能一味地提高其临界退火温度.加热速率80℃/s,退火温度为880℃时,残余奥氏体形态不仅仅局限于细小的块状结构;而且在贝氏体铁素体板条间能观察到大量的薄膜状残余奥氏体.细小、弥散的V（C,N））分布于铁素体或贝氏体基体中,大部分析出粒子直径在4—9 nm之间,实验钢具有优异的强度与塑性配合：R_m=1010 MPa,R_（P0.2）=690 MPa,δ=23.6%,n=0.27,r=1.17,强塑积达到23836 MPa.%.退火温度过高或过低,都会减少残余奥氏体的体积分数、改变其形貌并增大其尺寸,导致综合力学性能下降.

英文摘要：

The effects of rapid heating continuous annealing on microstructure and mechanical properties of ultra-high strength and low silicon TRIP steel containing phosphorus and vanadium were investigated.The results show that the yield and tensile strengths are increased with increasing inter- critical annealing temperature during rapid continuous annealing.However,the intercritical annealing temperature can not increase blindly to ensure its excellent combined mechanical properties.When the heating rate is 80°C/s and intercritical annealing temperature is 880°C,the retained austenite not only contains fine blocky structure,but also a large amount of interlath retained austenite films. A great amount of V（C,N） precipitates exists within ferritic matrix,and the sizes of most of the precipates are in the range from 4 to 9 nm.The tested steel has excellent mechanical properties：Rm = 1010 MPa,-Rp0.2=690 MPa,（5=23.6%,n=0.27,r=1.17,the product of strength and ductility（Rm xS） is 23836 MPa-%.If the intercritical annealing temperature is too high or too low,the comprehensive mechanical properties will be deteriorated since the volume fraction of retained austenite reduces, morphology changes and its size increase.