论文部分内容阅读
无取向电工钢两相区脱碳退火获得柱状铁素体晶粒可有效改善材料组织的均匀性.本文从动力学角度分析柱状晶的生长过程.柱状晶的形成分为“形核”和定向生长两个阶段,其中定向生长过程本质上是反应扩散和再结晶长大共同引起的界面迁移,且在动力学上符合抛物线规律,但其生长速率与退火温度之间并非呈单调的变化关系,而是在900℃时呈极大值.最后结合柱状晶生长速率的导出公式得到柱状晶“晶核”的尺寸约束条件,这对实际生产过程中无取向电工钢脱碳工艺的设计有一定的指导意义.
Obtaining columnar ferrite grains by decarburization annealing in the non-oriented electrical steel can effectively improve the homogeneity of the material microstructure. In this paper, the growth of columnar grains is analyzed from the kinetic point of view. The formation of columnar grains is divided into “nucleation” And directional growth. The directional growth process is essentially the interfacial migration caused by reaction diffusion and recrystallization and growth, and is parabolic in kinetics. However, the growth rate does not change monotonically with the annealing temperature But at 900 ℃, the maximum value is obtained.According to the derivation formula of the columnar crystal growth rate, the size constraints of the columnar crystal “crystal core ” are obtained, which is of great importance for the decarburization process of the non-oriented electrical steel in the actual production process Design has some guiding significance.