拉伸预应变对TRIP钢显微组织和力学性能影响

Effect of Tensile Pre-Strain on Microstructure and Mechanical Properties of TRIP Steels

对TRIP 590和TRIP 780两种强度级别的钢板进行了应变量为5%,10%,15%的拉伸预应变,通过静态拉伸试验和扫描电镜研究了拉伸预应变对钢中残余奥氏体含量和力学性能的影响。结果表明:随着预应变量的增加,钢中的残余奥氏体含量减少,马氏体转变;拉伸预应变提高了钢的抗拉强度和伸长率,随预应变量的增大,强度明显增加,塑性变化不大。

TRIP 590 and TRIP 780 steel were pre-stained by tension with strain of 5%, 10% and 15% respectively. The effects of tension pre-strain on retained autensite content and mechanical properties were studied by static tensile test and scanning electron microscopy. The results show that the content of retained austenite in steel reduced and transformed to martensite with increase of the pre-strain, the tensile pre-strain increased tensile strength and elongation of the steel. Strength increased obviously, but ductility changed a little with increase of pre-strain.