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Nb-alloyed Cr-steel in Simulated Strip Casting Process

机译：铌合金铬钢的模拟带​​钢铸造工艺

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摘要

Nb alloyed ferritic Cr-steel is usually produced by continuous casting with following hot and cold rolling procedure. In the laboratory scale the possible new route via strip casting was studied. The scope of the investigation in simulated process route was the development of microstructure and precipitations. In the experiments process parameters similar to those of the real strip caster were chosen, then those of hot rolling and cold rolling of such cast strips. The quickly solidified layer was produced by immersion of a steel substrate under vacuum into melt. The microstructure showed small niobium precipitates in the grain matrix and at the grain boundaries. Their size and distribution was evaluated for different niobium contents and cooling rates in the as-solidified structure. The diffusion controlled change of the precipitate morphology was also analysed after preheating and rolling. Reprecipitation and precipitate growth, as well as dissolution of precipitations at the grain boundaries were observed. The effect of various cooling rates and niobium content on the shape and formation of niobium containing precipitates and on the grain boundary is discussed. Thermodynamic calculations using FactSage were carried out in order to predict the precipitation of Nb-rich phases in ferritic stainless steels. The effect of the chemical composition and temperature on the thermodynamic stability of these precipitates was evaluated.
机译：Nb合金铁素体Cr钢通常是通过连续铸造以及随后的热轧和冷轧工序生产的。在实验室规模中，研究了通过带材铸造的可能新路线。模拟过程路线中的研究范围是微观结构和沉淀的发展。在实验中，选择了与真实带钢连铸机相似的工艺参数，然后选择了这些铸带的热轧和冷轧工艺参数。通过在真空下将钢基底浸入熔体中来产生快速固化的层。显微组织显示出在晶粒基体中和晶界处有少量的铌沉淀。对于凝固态结构中不同的铌含量和冷却速率，评估了它们的尺寸和分布。在预热和轧制之后，还分析了沉淀物形态的扩散控制变化。观察到再沉淀和沉淀物生长，以及在晶界处沉淀物的溶解。讨论了各种冷却速率和铌含量对含铌沉淀物的形状和形成以及晶界的影响。为了预测铁素体不锈钢中富Nb相的析出，进行了使用FactSage的热力学计算。评价了化学组成和温度对这些沉淀物的热力学稳定性的影响。

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