Abstract: The structure of TRIP(transfornation 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 transforation)curves  and to obtain that the bainite particle occured 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 10 kg 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- σ_b was 715 MPa,σ_s 520 MPa,ratio of yield strength to tensile strength 0.73 and  elongation δ 20%.

Key words: C-Si-Mn TRIP Steel,Dynamic CCT Curves,Structure,Mechanical Properties

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σ_b715 MPa,σ_s520 MPa,屈强比0.73,δ20%。

关键词: C-Si-Mn TRIP钢, 动态 CCT 曲线, 组织, 力学性能