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一、绪言晶粒度与屈服强度之间的函数关系可用Hallpetch公式描述: σ_s=σ_0+Kd~(-1/2) (1)式中σ_0及K——常数; d——晶粒直径。可见材料的屈服强度随晶粒度的减小而提高。此外,晶粒粗细及组织的不同,对于连续铸锭及铸件的机械性能与工艺性能也有重要影响;匀细的组织还可以避免热裂纹的产生,避免偏析,缩松以及表面质量也可得到改善。因此,对于细化晶粒的研究不仅为
I. INTRODUCTION The relationship between grain size and yield strength can be described by the Hallpetch formula: σ_s = σ_0 + Kd -1/2 where σ_0 and K - constants; d - grain diameter. It can be seen that the yield strength of the material increases as the grain size decreases. In addition, the grain size and texture of the different, for continuous ingot and castings mechanical properties and process performance also has a significant impact; even the fine organization can also avoid hot cracks, to avoid segregation, shrinkage and surface quality can be improved . Therefore, the study of grain refinement is not limited to