NDLI: Aging of a New Niobium-Modified MAR-M247 Nickel-Based Superalloy

Content Provider	Springer Nature Link
Author	Baldan, Renato Azevedo e Silva, Paulo Ricardo Soares Nunes, Carlos Angelo Coelho, Gilberto Carvalho
Copyright Year	2013
Abstract	MAR-M247 is a nickel-based superalloy that contains 3 wt.% Ta (weight percent of tantalum). Considering the chemical similarity between tantalum and niobium (Nb) and the lower cost of Nb, a modified MAR-M247 superalloy was produced with total replacement of Ta by Nb in this work. The samples were previously solutioned at 1260°C for 8 h and then aged at different times (between 5 and 80 h) and temperatures (between 780 and 980°C). The microstructures of the aged samples were characterized with a scanning electron microscope (SEM and FEG-SEM, both with EDS). Simulations of the MC carbide and γ′ fraction and the Ta and Nb content in both MC carbide and γ′ phase were performed with Thermo-Calc software (TT_Ni8 database) and simulations of the γ′ growth rate and γ′ mean diameter were performed with JMatPro software. MC carbide with high Hf content was observed in all the aged samples, in agreement with thermodynamic simulation results. The equilibrium γ′ fraction decreases from 67 mol.% at 780°C to 52 mol.% at 980°C. Good agreement between the calculated and experimentally determined γ′ particle size was also found. The growth rate of γ′ at 980°C is about 8 times higher than that at 780°C and 3 times higher than that at 880°C. The hardness values do not change considerably after aging at 780 and 880°C. However, these values decrease significantly after aging at 980°C.
Starting Page	2337
Ending Page	2342
Page Count	6
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	22
Issue Number	8
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2013-04-02
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	aging JMatPro MAR-M247 nickel-based superalloy niobium Thermo-Calc Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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