Premium
Grain Selection and Crystal Orientation in Single‐Crystal Casting: State of the Art
Author(s) -
Raza Muhammad Huzaifa,
Wasim Ahmad,
Hussain Salman,
Sajid Muhammad,
Jahanzaib Mirza
Publication year - 2019
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201800177
Subject(s) - materials science , casting , single crystal , superalloy , directional solidification , ceramic , crystal (programming language) , orientation (vector space) , mold , spiral (railway) , selection (genetic algorithm) , metallurgy , mechanical engineering , crystallography , composite material , computer science , geometry , mathematics , alloy , engineering , chemistry , artificial intelligence , programming language
Abstract The properties of single‐crystal superalloys depend highly upon crystallographic orientation and the selection of single crystal (SX) in directional solidification (DS) process. The assessment of SX selection and crystallographic orientation determines the mechanical properties of the casting. Generally, it is considered that the deviation from [001] orientation should be less than 10° for better mechanical properties. This article provides a quantitative literature review analyzing the experimental results of 30 papers that studied the effects of process parameters on crystal orientation and grain selection in SX‐casting process. Key parameters that control the SX casting during DS process include spiral selector parameters, starter block parameters, withdrawal rate, pouring temperature, and ceramic mold temperature. The analysis in this research provides a strong evidence to assist the standard operating range of each parameter. A lack of focus in the literature on alloys is found. A framework based on the key parameters is also proposed in this review.