薄板坯连铸连轧C-Si-Mn TRIP钢组织和力学性能的研究  

Study on Structure and Mechanical Properties of C-Si-Mn TRIP Steel Produced by Thin Slab Casting and Rolling Process

作　　者：张迎晖[1] 康永林[1] 于浩[1] 刘晓[2] 方圆[2] 

机构地区：[1]北京科技大学材料科学与工程学院 [2]上海宝钢集团公司,上海200941

出　　处：《特殊钢》2005年第6期32-34,共3页Special Steel

基　　金：国家自然科学基金资助项目(50334010)

摘　　要：用Gleeble-1500热/力模拟机研究了成分(%)为:0.20C-1.08Si-1.43Mn TRIP(相变诱导塑性)钢连续冷却时的组织,并测得动态CCT(连续冷却转变)曲线,得出冷却速度达10℃/s时出现粒状贝氏体,冷却速度15℃/s时得到板条贝氏体。在实验室模拟C-Si-Mn TRIP钢薄板坯连铸连轧工艺试验:用10 kg真空感应炉冶炼,成分(%)为:0.20C-1.54Si-1.55Mn的TRIP钢,钢锭尺寸为(mm):60×100×130,经7道次轧制成厚度6.40 mm板,终轧温度810℃,轧后空冷至700℃,再水冷至400℃模拟卷取。试验结果表明,该钢组织含有5.13%残余奥氏体,37.20%贝氏体,机械性能σb715 MPa,sσ520 MPa,屈强比0.73,δ20%。The structure of TRIP （transformation induced plasticity） steel 0.20C-1.08Si-1.43Mn during continuous cooling has been studied by Gleeble-1500 thermal simulation machine to get CCT （ continuous cooling transformation） curves and to obtain that the bainite particle occurred with cooling rate 10℃/s and the lath bainite got with cooling rate 15℃/s. The thin slab casting and rolling process test of 0.20C-1.54Si-1.55Mn TRIP steel melted by a 10kg vacuum induction furnace with ingot dimension 60 mm×100 mm×130 mm was carried out in laboratory which was rolled to 6.40 mm plat by 7 pass rolling with finish rolling at temperature 810℃, and air cooling to 700℃ than water cooling to 400℃ to simulate coiling. The test results showed that there was 5.13% retained austenite, 37.20% bainite and the rest-ferrite in structure of steel, of which the mechanical property- σb was 715MPa, σs 520MPa, ratio of yield strength to tensile strength 0.73 and elongation δ 20 %.

关 键 词：C-Si-Mn TRIP钢 动态CCT曲线 组织 力学性能 薄板坯连铸连轧 钢组织 连续冷却转变 粒状贝氏体 Mn 

分 类 号：TG113[金属学及工艺—物理冶金]