热处理工艺对低碳Si-Mn 系TRIP钢组织和性能的影响
Influences of Heat Treatment on Microstructure and Mechanical Properties of Low Carbon Si-Mn TRIP Steel
张亚江1,2, 刘清友2, 贾书君2, 项金钟1
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作者单位：(1. 云南大学 物理科学与技术学院, 云南 昆明 650091; 2．钢铁研究总院 结构材料研究所, 北京 100081)
中文关键字：TRIP钢； 热处理工艺； 残余奥氏体； 晶粒尺寸
英文关键字：trip steel; heat treatment; retained austenite; grain size
中文摘要：采用定量彩色金相、X射线衍射和拉伸试验等方法，研究了热处理工艺及不同的冷轧压下率对低碳Si-Mn系TRIP钢组织和力学性能的影响。结果表明，对于不同的退火温度，再结晶铁素体和二次铁素体的含量不同。当冷轧压下率为55%时，经820 ℃× 110 s + 410 ℃ × 440 s热模拟工艺后，实验钢中铁素体量约为60%，贝氏体和马氏体量约为34%，残余奥氏体含量约为6%，残余奥氏体的碳含量为1.3%，可以获得好的相变诱发塑性及好的强韧性配合。
英文摘要：The influences of heat treatment and cold rolling reduction rate on the microstructure and mechanical properties of low carbon Si-Mn TRIP steel were studied by color metallograph method, X-ray diffraction and tensile testing. The results show that for different intercritical annealing temperatures, the volume fraction of αRex and αⅡ is different. The volume fraction of ferrite is 60%, the volume fraction of bainite and mastensite is 34%, and the volume fraction and carbon content of retained austenite reachs the highest values of 6% and 1.3%, respectively. The best product in strength and ductility is obtained by heat-treating in 820 ℃× 110 s + 410 ℃ × 440 s when cold rolling reduction rate is 55%.