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http://dx.doi.org/10.18770/KEPCO.2020.06.02.137

Evaluation of the Microstructure and Mechanical Properties for Ni Superalloy Materials Using HIP and Post Heat Treatment  

Kim, Youngdae (KEPCO Research Institute, Korea Electric Power Corporation)
Hyun, Jungseob (KEPCO Research Institute, Korea Electric Power Corporation)
Chang, Sungyong (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.6, no.2, 2020 , pp. 137-143 More about this Journal
Abstract
The CM247LC, a Ni-based superalloy material used for gas turbine hot gas path parts, is casted using directionally solidified technology to analyze the mechanical properties and microstructures through HIP (Hot Isostatic Pressing) and post-heat treatment, and to derive optimal HIP treatment conditions. The CM247LC material is being researched in various ways as an alternative material for prototyping gas turbine blades. In particular, the blade rotating part is exposed and operated in a high temperature and high-pressure environment, and when damaged, it may cause huge economic losses. Therefore, in order to use the CM247LC material as prototyping materials for gas turbine blades, the reliability of the microstructure and mechanical properties must be verified. In this study, after casting rod test specimens using CM247LC material by directionally solidified technology, after that the specimens were performed by HIP treatment and post-heat treatment to test two HIP conditions designed by KEPCO to derive the possibility of prototyping of CM247LC material and optimization of HIP treatment conditions. Additionally, the properties of CM247LC material were compared to the GTD111DS material using for 1,300℃ class gas turbine blades.
Keywords
Gas turbine; CM247LC; GTD111; Blades; Microstructure; Mechanical Property;
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