初始组织对钒微合金化TRIP钢组织性能的影响

对一种低硅含磷和钒的TRIP钢进行热轧、冷轧及连续退火,研究不同热轧初始组织对组织特征与力学性能的影响.通过不同工艺得到两种不同的热轧初始组织:F+P钢;F+B钢.在相同的冷轧连续退火工艺条件下,初始组织为F+B钢相比较F+P钢,组织中含有较多体积分数的贝氏体和残余奥氏体组织,而且残余奥氏体尺寸更为细小,分布更为弥散,屈服强度和抗拉强度较高,但延伸率、n值和r值略低.初始组织为F+B钢的抗拉强度可达980MPa,强塑积为21 952MPa.%.

Effect of Initial Microstructure on Final Microstructure and Mechanical Properties of V-microalloyed TRIP-Aided Sheet Steel

The effect of initial microstructure on the final microstructural characteristics and the mechanical properties was investigated for low silicon TRIP steel containing phosphorus and vanadium after hot rolling,cold rolling and continuous annealing.The two different microstructures were obtained by different hot rolling processes,i.e.,F+P steel and F+B steel.Compared with F+P steel,the volume fractions of bainite and retained austenite in F+B steel are higher for the same cold rolling and continuous annealing process;the retained austenite is smaller in size and more dispersive in distribution,and the yield strength and the tensile strength are higher,but the elongation,the n value and the r value are slightly lower.The tensile strength reaches up to 980 MPa,and the strength-ductility balance is 21 952 MPa·% for F+B steel.