论文部分内容阅读
利用电阻加热和感应加热Bridgman定向凝固系统对非小平面包晶系模型合金Fe-Ni合金进行系统的定向凝固实验研究,探索2种常规定向凝固条件下对流对包晶合金定向凝固过程中带状组织和宏观偏析的影响规律.发现在高G/V定向凝固过程中,对流使包晶合金定向凝固过程中轴向和径向形成严重的宏观偏析,从而使组织演化异常复杂且难以达到稳态.轴向宏观偏析体现在有限长试样从定向凝固开始至凝固结束都将发生初生相向包晶相的转变过程,转变过程受合金成分和对流强度影响.径向宏观偏析体现在试样心部贫溶质易形成初生相,边缘富集溶质易形成包晶相,在径向上也存在初生相向包晶相的转变过程.
The Bridgman directional solidification system with resistance heating and induction heating was used to systematically study the directional solidification of the non-faceted pericarp model Fe-Ni alloy. The effects of convection on the directional solidification of the peritectic alloy during directional solidification were investigated. And macroscopic segregation.It is found that in the high G / V directional solidification, the convection makes the macroscopic segregation in the axial and radial direction during the directional solidification of the peritectic alloy, so that the evolution of the microstructure is extremely complex and it is difficult to reach the steady state. Axial macroscopic segregation is reflected in the finite length sample from the beginning of the directional solidification to the end of solidification will occur during the transformation phase of the primary peritectic, the transformation process by the alloy composition and the convection intensity of radial macroscopist segregation in the heart of the sample poor The solute is easy to form the primary phase, the edge enrichment solute is easy to form the peritectic phase, and there is also the transformation process of the primary relative peritectic phase in the radial direction.