Single Point Turning Process Optimization of Fine Grain Processed 718

Hann, Brian; Greving, Dan; Kington, Harry; Rice, Derek; Engines, Honeywell

doi:10.7449/2005/superalloys_2005_719_719

Cited by 2 publications

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High-Temperature Deformation of Inconel 718PlusTM

Özturk

Cabrera

Calvo

2016

Journal of Engineering for Gas Turbines and Power

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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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High-Temperature Deformation of Inconel 718PlusTM

Özturk

Cabrera

Calvo

2016

Journal of Engineering for Gas Turbines and Power

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High Temperature Deformation of Inconel 718Plus™

Özturk

Cabrera

Calvo

2016

Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy

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Since its introduction in 2003, alloy 718Plus™ spurred a lot of interest owing to its increased maximum service temperature over conventional Inconel 718 (704°C vs 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 is 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 718Plus™ 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 PTT diagram was reported and modeling of the flow curves via hyperbolic sine model were 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.

show abstract

Single Point Turning Process Optimization of Fine Grain Processed 718

Cited by 2 publications

References 0 publications

High-Temperature Deformation of Inconel 718PlusTM

High-Temperature Deformation of Inconel 718PlusTM

High Temperature Deformation of Inconel 718Plus™

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