A critical condition for the formation of a coarse columnar gamma grain structure in a peritectic solidified carbon steel

作者：Ohno Munekazu^*; Maruyama Masato; Matsuura Kiyotaka

来源：Acta Materialia, 2013, 61(19): 7334-7341.

DOI：10.1016/j.actamat.2013.08.039

• Casting
• As-cast austenite grain
• Solidification microstructure
• Peritectic reaction

The formation of a coarse columnar austenite grain (CCG) structure is a serious problem in continuous casting processes of peritectic solidified carbon steels. In this study, a guiding principle for the avoidance of CCG formation is developed. The critical condition for CCG formation recently put forward based on phase-field simulations, which is given by a balance between the cooling condition and the growth rate of the CCG, is first re-examined and modified by considering the effect of a liquid phase during the CCG formation. The validity of this critical condition is then investigated by three different casting experiments combined with heat conduction analyses. From a comparison between the cooling conditions and the resulting microstructural changes, the validity of the critical condition is successfully demonstrated.

• 出版日期2013-11