Numerical and Experimental Evaluation of Stray Grains Formation During Single Crystal Growth

مهندسی متالورژی و مواد

Article 2, Volume 28, Issue 2 - Serial Number 16, August 2017, Pages 13-26   

Document Type: Original Articles

DOI: 10.22067/ma.v28i2.35238

Authors

mohsen Ghanbari^* ; Saeed Shabestari; Mohammad Reza Aboutalebi

Iran University of Science and Technology.

Abstract

Stray grain formation during single crystal growth with growth rates of 3, 5 and 7 mm/min has been assessed. The results revealed that increasing the growth rate resulted in the decrement of thermal gradient in the solidification front and caused stray grain formation in the solidification front of the columnar grain growth. Experimental and numerical results showed that a well-oriented single crystal structure is obtained at a growth rate of 3 mm/min in Ni-based superalloy. Stray grain formation occurred at growth rates greater than 3 mm/min, as a result of high growth rate and low thermal gradient.

Keywords

Single Crystal Growth; Stray Grains Formation; Thermal Gradient; Growth Rate; Numerical simulation

Supplementary Files

2-ghanbari_AK_EDITS.pdf

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