Microstructure and grain orientation evolution of a specially shaped shroud during directional solidification process

作     者：Hongquan Hao Weiguo Jiang Guang Xie Gong Zhang Yuzhang Lu Jian Zhang Langhong Lou 

作者机构：Institute of Metal Research Chinese Academy of Sciences 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2013年第23卷第2期

页      面：211-215页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Basic Research Program(973 Program) of China (No. 2010CB631201) the National Natural Science Foundation of China (No. 50931004) 

主　　题：Directional solidification Shroud Dendrite Undercooling Low angle grain boundary 

摘      要：The microstructure and the grain orientations of one shroud prepared by directional solidification process have been investigated using metallographic method and electronic backscatter diffraction (EBSD). The results indicate that the solidification process of the tested shroud is composed of three steps: dendritic branching, the break-up and drift of the dendrite arms and the solidification of the residual liquid. Misoriented grains were formed between the primarily solidified dendrite stems during the process of recalescence which was caused by the accumulation of the solidification latent heat. A low angle grain boundary of 61 was produced across the impinging dendrite fronts.