The Evaluation of MAR-M247 Microstructural Changes after Standard Heat Treatment and Creep Test

Subject Areas : Journal of Environmental Friendly Materials

Arman Rabieifar ¹ , Mostafa Erfan ² , Narges Shahidi ³

1 - مرکز تحقیقات مواد مهندسی پیشرفته دانشگاه آزاد اسلامی واحد کرج
2 - Advanced Materials Engineering Research Center, Karaj Branch, Islamic Azad University, Karaj, Iran
3 - Advanced Materials Engineering Research Center, Karaj Branch, Islamic Azad University, Karaj, Iran

Received: 2024-07-12 Accepted : 2024-11-19 Published : 2024-12-15

Keywords: MAR-M247 Superalloy, Creep, Microstructure, Heat Treatment,

Abstract :

The cast nickel-base MAR-M247 superalloy has been widely used for high-temperature components. In this work, the creep and room temperature tensile behavior of MAR-M247 superalloy after dual-stage standard heat treatment is evaluated. The microstructure of heat-treated superalloy consists of a matrix with a -eutectic, strengthening cubic precipitates, and particulate, script-like carbides at the grain boundaries (GBs). Under the creep testing conditions in this study, the volume fraction and primary gamma prime size increased; the script-like MC carbide along the GB elongated, and the TCP phase formed in the vicinity of grain boundary carbides. On the other hand, during the creep test, the thin film formed around the gamma prime phase became thicker, causing an increase in the toughness of the superalloy and an expansion of the steady-state stage in the creep curve.

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