通过真空感应炉浇注实验和热力学软件分析研究了Nb、Ti稳定化元素和C、N间隙元素含量对超纯铁素体不锈钢凝固组织及晶粒簇的影响。结果表明,添加稳定化元素后实验钢的结晶区间变宽,通过控制稳定化元素和间隙原子含量使实验钢在凝固过程中析出较多TiN粒子,可以有效的提高凝固组织的等轴晶率。在充分退火条件下,与Ti单一稳定化实验钢相比,Nb、Ti复合稳定化实验钢中的晶粒簇较弱并具有较小的晶粒尺寸,有利于带钢的抗起皱性能。
Effects of Nb,Ti alloying elements and C,N interstitial elements on solidification structure and grain colonies in an ultra purified ferritic stainless steel were investigated by smelting and casting tests using a vacuum induction furnace and thermodynamic analysis with Thermo-Calc software.The results show that the addition of Nb and Ti increases the crystallization interval of the tested steel.The number of TiN particles formed during solidification increase as a result of optimizing the micro-alloying elements and interstitial elements,increasing the equaixed grains ratio in solidification structure.After cold rolling and sufficient annealing,the grain colonies in the sheet dual-stabilized with Nb and Ti are less obvious than those in the Ti single-stabilized steel and the grain size is smaller,improving the surface ridging resistance.
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