Research on Microstructure Control and Improvement of Steel Seets Produced by Continuous Strip Casting Process

本文研究了19%Cr铁素体不锈钢凝固柱状晶再结晶组织的显微组织控制.[1]轧制变形量和退火温度对再结晶组织的影响冷轧变形量分别为50%、70%和90%，而随后的退火温度为700~1000ﾟC.对不同轧制和退火条件下的试件进行了显微组织观察和X射线极图测量.结果表明，单纯增加变形量或提高退火温度不能获得细小均匀的再结晶组织。[2]反复轧制和退火改善再结晶组织。在(001)[110]初始取向的柱状晶中，尽管这种取向的柱状晶具有很低的再结晶率和粗大的再结晶组织，但其再结晶晶粒的取向是随机的。考虑到这一事实，为了改善柱状晶的再结晶组织，对其进行了反复冷轧和退火处理。结果表明，重复70%冷轧和973K退火两次循环可获得细小均匀的再结晶组织。

The following experimental stuies have been carried out to examine the microstructre control of recrystallization structure of solidified columnar crystals in a 19%Cr ferritic stainless steel.[1] Effects of Rolling Reductiion and Annealing Temperature on Recrystallization StructureReduction of cold-rolling was altered as 50%, 70%, and 90%, whereas subsequent annealing temperature was chainged from 700 to 1000ﾟC.Mirostructural observations and X-ray pole figure measurements were performed on specimens with different rolling and annealing conditions. The results showed that a favorable recrystallization structure with fine and uniformgrain size cannot be obtained simply by increasing rolling reduction or by increasing annealing temperature.[2] Improvement of Recrystallization Structure by the Repetition of Rolling and AnnealingThe orientations of recrystallized grains in a (001)[110]initially-oriented columnar crystal are random although such an oriented columanr crystal exhibits a very low recrystallization rate and a coarse recrystallization structure. Taking into account the above fact, the repetition of cold-rolling and annealing was applied to a columnar crystal specimen in order to improve its recrystallization structure. The result showed that a fine and uniform recrystallization structure can be achieved by two cycles of the repetition of 70% cold rolling and 973K annealing.