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制作直径10mm试样模拟铸坯表面,使用Gleeble-2000D热模拟试验机研究表面控制冷却下强冷和返温阶段板坯表面热塑性及组织形貌的变化规律,为表面组织控制冷却在立弯式板坯连铸机上的应用提供理论依据。研究结果表明:强冷阶段,魏氏组织和膜状先共析铁素体的形成造成试样塑性恶化。返温阶段,返温处理有效地消除了这种恶化,将试样断面收缩率最小值提高至40%以上。因此表面控制冷却在立弯式连铸机上应用时,强冷阶段应在铸坯进入弯曲段之前完成,铸坯可以在返温阶段进入弯曲段。
The diameter of 10mm specimens was simulated to simulate the surface of slab. The change rule of surface thermoplasticity and microstructure was studied by Gleeble-2000D thermal simulation test machine under the condition of controlled surface cooling, Slab continuous casting machine to provide a theoretical basis for the application. The results show that the formation of Widmanstatten and membranous pro-eutectoid ferrite results in deterioration of the plasticity of specimens during the cooling stage. Return temperature stage, back to warm treatment effectively eliminate this deterioration, the minimum cross-sectional area of the sample increased to 40% or more. Therefore, when the surface-controlled cooling is applied on the vertical caster, the strong cooling stage should be completed before the slab enters the curved section, and the slab can enter the curved section during the warm-up phase.