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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。
The effects of Nb, Ti stabilizing elements and C, N interstitial elements on solidified microstructure and grain clusters of ultrapure ferritic stainless steel were analyzed by pouring experiment and thermodynamic software in vacuum induction furnace. The results show that the crystallization range of the experimental steel increases with the addition of stabilizing elements. By controlling the content of stabilizing elements and interstitial atoms, more TiN particles are precipitated in the experimental steel during solidification, which can effectively increase the equiaxed grain rate of the solidified structure. In the fully annealed condition, the grain clusters in the Nb and Ti composite stabilized experimental steels are weaker and have smaller grain size than Ti single stabilized experimental steel, which is favorable for the anti-crease performance of the strip.