Since its introduction in 2003, alloy 718PlusTM spurred a lot of interest owing to its increased maximum service temperature over conventional Inconel 718 (704 °C versus 650 °C), good formability, and weldability together with its moderate cost. Understanding the high-temperature deformation characteristics and microstructural evolution is still of interest to many. It is known that the service performance and hot-flow behavior of this alloy are a strong function of the microstructure, particularly the grain size. To develop precise microstructure evolution models and foresee the final microstructure, it is important to understand how and under which forming conditions softening and precipitation processes occur concurrently. In this work, the softening behavior, its mechanisms, and the precipitation characteristics of 718PlusTM were investigated in two parallel studies. While cylindrical compression tests were employed to observe the hot-flow behavior, the precipitation behavior and other microstructural phenomena such as particle coarsening were tracked via hardness measurements. A precipitation–temperature–time (PTT) diagram was reported, and modeling of the flow curves via hyperbolic sine model was discussed in the light of the PTT behavior. Both “apparent” approach and “physically based” approach are implemented and two different sets of parameters were reported for the latter. Finally, recovery and recrystallization kinetics are described via Estrin–Mecking and Bergstrom, and Avrami kinetics, respectively.
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March 2017
Research-Article
High-Temperature Deformation of Inconel 718PlusTM
Utkudeniz Ozturk,
Utkudeniz Ozturk
ETSEIB,
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: utkudeniz.ozturk@upc.edu
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: utkudeniz.ozturk@upc.edu
Search for other works by this author on:
Jose Maria Cabrera,
Jose Maria Cabrera
Centre Tecnologic Manresa (CTM),
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
ETSEIB,
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
Search for other works by this author on:
Jessica Calvo
Jessica Calvo
Centre Tecnologic Manresa (CTM),
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
ETSEIB,
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
Search for other works by this author on:
Utkudeniz Ozturk
ETSEIB,
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: utkudeniz.ozturk@upc.edu
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: utkudeniz.ozturk@upc.edu
Jose Maria Cabrera
Centre Tecnologic Manresa (CTM),
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
ETSEIB,
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
Jessica Calvo
Centre Tecnologic Manresa (CTM),
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
Plaza de la Ciencia, 2, Manresa,
Barcelona 08242, Spain;
ETSEIB,
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
Polytechnic University of Catalonia,
Av. Diagonal, 647,
Barcelona 08028, Spain
1Corresponding author.
Contributed by the Manufacturing Materials and Metallurgy Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 20, 2016; final manuscript received July 27, 2016; published online October 11, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Mar 2017, 139(3): 032101 (7 pages)
Published Online: October 11, 2016
Article history
Received:
June 20, 2016
Revised:
July 27, 2016
Citation
Ozturk, U., Maria Cabrera, J., and Calvo, J. (October 11, 2016). "High-Temperature Deformation of Inconel 718PlusTM." ASME. J. Eng. Gas Turbines Power. March 2017; 139(3): 032101. https://doi.org/10.1115/1.4034539
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