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利用Gleeble 1500热模拟机测定了簿板坯连铸连轧EAF-CSP工艺生产的低碳含锰钢经奥氏体区二次变形后的CCT曲线.实验钢含有0.17％C,1.21％Mn和0.28％Si(质量分数).研究表明:提高热轧后的冷却速度使Ar_3温度降低,导致试验钢的晶粒进一步细化;冷速大于20℃/s时,出现贝氏体和铁素体的混合组织,可降低钢的屈强比;790℃终轧,550℃卷曲时出现铁素体/珠光体带状组织,提高冷速使溶质(如Mn和C)富集区在形成珠光体之前完成奥氏体—铁素体相变是避免生成铁素体/珠光体带状组织的有效方法.
The CCT curves of the low carbon Mn-containing steels produced by the EAF-CSP process after secondary deformation in austenitic zone were measured by Gleeble 1500 thermal simulator.The experimental steels contained 0.17% C, 1.21% Mn and 0.28% Si (mass fraction) .The results show that increasing the cooling rate after hot rolling reduces the Ar_3 temperature, resulting in further refinement of the grain size of the test steel. When the cooling rate exceeds 20 ℃ / s, bainite and ferrite , The yield strength ratio of steel can be reduced. When ferrite / pearlite banding occurs at 790 ℃ and rolling at 550 ℃, the cooling rate increases the concentration of solute (such as Mn and C) The previously completed austenite-ferrite transformation is an effective method to avoid the formation of ferrite / pearlite banding.