Solution heat treatment of single crystal castings of CMSX-4 nickel-base superalloy
Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
Faculty of Engineering, Department of Industrial Engineering, Stellenbosch University
Abstract
An investigation of the microstructure and mechanical properties for heat treated directionally cast
rods, produced from the nickel-based superalloy, CMSX-4, is presented. The rods were cast
using the Bridgman method for manufacturing single crystal structures. The microstructure of the
cast rods consists of γ and γ' precipitates. This microsegregation has a negative effect on the
microstructure and, hence, the mechanical properties of the castings. The solution heat treatment
of the second generation, single crystal Ni-base superalloy, CMSX-4, is known to dissolve the
eutectic γ and γ' region. This requires temperatures up to 1316°C and approximately 45 hours
total time. These high temperatures and long processing times result in high costs. The aim of
this study is to investigate the effect of the heat treatment protocol on the extent of improvement of
quality of single crystal castings, as a basis for determining cost feasibility in practice.
Description
CITATION: Rzyankina, E., et al. 2016. Solution heat treatment of single crystal castings of CMSX-4 nickel-base superalloy. In Competitive Manufacturing, International Conference on Competitive Manufacturing (COMA '16), 27-29 January 2016, Stellenbosch, Stellenbosch University, South Africa.
The original publication is available at http://conferences.sun.ac.za/index.php/doie/coma16
The original publication is available at http://conferences.sun.ac.za/index.php/doie/coma16
Keywords
Nickel-aluminum alloys, CMSX-4, Crystallography, Metals -- Heat treatment
Citation
Rzyankina, E., et al. 2016. Solution heat treatment of single crystal castings of CMSX-4 nickel-base superalloy. In Competitive Manufacturing, International Conference on Competitive Manufacturing (COMA '16), 27-29 January 2016, Stellenbosch, Stellenbosch University, South Africa