终轧温度对低硅含磷系TRIP钢组织性能的影响  

Effects of Finish Rolling Temperature on Microstructure and Mechanical Properties of Low Silicon Containing Phosphorus TRIP Steel

作　　者：侯晓英[1] 许云波[1] 吴迪[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《钢铁研究学报》2011年第10期33-37,49,共6页Journal of Iron and Steel Research

基　　金：中央高校基本科研业务费资助项目(N090407001);十一五国家科技支撑计划项目(2007BAE51B07);国家自然科学基金重点资助项目(50734001)

摘　　要：通过实验室热轧试验,研究了不同终轧温度下低硅含磷系热轧TRIP钢的组织特征及性能特点。结果表明:终轧温度由900℃降低到790℃,铁素体体积分数增加,贝氏体体积分数降低,残余奥氏体体积分数变化不太明显;终轧温度900和820℃时,得到贝氏体为基体的室温组织;终轧温度降低到790℃时,低温变形促进了奥氏体到铁素体的相变率,基体组织尺寸为约4.5μm的细小均匀的等轴状铁素体晶粒,而且存在大量位错。与其他工艺相比,终轧温度790℃时具有优良的综合力学性能:抗拉强度825MPa,断后总伸长率21.5%,屈强比0.64。The microstructure and mechanical properties of different finishing temperatures for hot rolled low silicon containing phosphorus TRIP steel were investigated using a laboratory hot rolling mill. The results show that when finishing temperature is decreased from 900 to 790 ℃, the volume fraction of ferrite is increased; the volume fraction of bainite is decreased; and the volume fraction of retained austenite has no evident changes. When finishing temperature are 900 and 820 ℃, hainite is used as matrix microstructure. Lower temperature deformation enhances the transformation rate of austenite to ferrite, also the fine, uniform and equiaxed ferrite grains can be obtained as matrix microstructure, the average ferrite grain size is about 4.5μ m, and the dislocations is observed in matrix, when finishing temperature is decreased to 790 ℃. Compared with other kind of processes, the steels have excellent mechanical properties when finishing temperature is 790 ℃： ultimate tensile strength, elongation and yield/strength ratio are 825 MPa, 21.5% and 0.64 respectively.

关 键 词：热轧TRIP钢 显微组织 力学性能 低硅含磷 终轧温度 

分 类 号：TG335.11[金属学及工艺—金属压力加工]