Thermosolutal convection-induced freckle formation in steady and unsteady directional solidification: analysis in Sn-Ni peritectic alloy

2021 ◽  
pp. 159558
Author(s):  
Peng Peng ◽  
Li Lu ◽  
Wanchao Zheng ◽  
Jiatai Wang ◽  
Shudong Zhou
Keyword(s):  
Directional Solidification ◽  
Thermosolutal Convection ◽  
Peritectic Alloy ◽  
Freckle Formation

scholarly journals A Phenomenological Analysis of Freckling in Directional Solidification of Ni-Base Superalloy: The Role of Edge and Curvature in Casting Components

2019 ◽  
Vol 51 (1) ◽  
pp. 88-92 ◽  
Author(s):  
D. X. Ma ◽  
Z. H. Dong ◽  
F. Wang ◽  
H. B. Dong
Keyword(s):  
Directional Solidification ◽  
Positive Curvature ◽  
Phenomenological Analysis ◽  
Geometrical Factor ◽  
Freckle Formation ◽  
Base Superalloy

Abstract The geometrical factor in freckle formation has rarely been taken into account. In this work, freckle formation in superalloy components is examined. It is found that freckle formation is subject to the effects of the edge and curvature. In polygonal casting sections, freckles are formed preferably on the convex edges. In the components with a curved contour, freckles are exclusively formed on the outward-curving surface having positive curvature.

Influences of travelling magnetic field on the dendritic structures of Sn–1.8Cd peritectic alloy during directional solidification

2013 ◽  
Vol 112 (2) ◽  
pp. 363-370 ◽  
Author(s):  
Lei Wang ◽  
Jun Shen ◽  
Xiao Yin ◽  
Yujun Du ◽  
Yilong Xiong ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Directional Solidification ◽  
Peritectic Alloy ◽  
Dendritic Structures

scholarly journals On migration of primary/peritectic interface during interrupted directional solidification of Sn-Ni peritectic alloy

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Peng Peng ◽  
Xinzhong Li ◽  
Jiangong Li ◽  
Yanqing Su ◽  
Jingjie Guo ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Peritectic Alloy

Simulations of the Effects of Mold Properties on Directional Solidification

2013 ◽  
Author(s):  
Mark A. Lauer ◽  
David R. Poirier ◽  
Robert G. Erdmann ◽  
Luke Johnson ◽  
Surendra N. Tewari
Keyword(s):  
Finite Element ◽  
Thermal Properties ◽  
Mushy Zone ◽  
Phase Change ◽  
Directional Solidification ◽  
Cross Section ◽  
Cross Sections ◽  
Mold Wall ◽  
Solidification Process ◽  
Thermosolutal Convection

The mold geometry and its thermal properties greatly influence the solidification process. Finite element simulations of directional solidification in various molds are presented. These simulations were performed using volume averaged properties in the mushy zone in order to model the convection, transport of solute and energy, and phase change occurring during solidification. These simulations show the interactions of the mold and alloy with the resultant solidification phenomena, including steepling. Mold geometries can cause macrosegregation because of shrinkage flows, by interrupting the development of the mushy zone, and by causing or influencing thermosolutal convection. Mold materials with different thermal properties result in different macrosegregation patterns even for the same geometries. Changes in cross section and the thermal properties of the mold also affect the gradients and solidification rates obtained in the alloy, as opposed to those measured on the mold wall. Simulations are compared qualitatively to a verification experiment of directionally solidifying a hypoeutectic Al-7wt%Si alloy in a mold with changing cross sections.

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