Investigation of the Microstructure an‎d Hot Deformation Behavior of Nickel-Based Superalloy Inconel 617

10/22/2026 12:00:00 AM

The nickel-based superalloy Inconel 617 is considered a strategic material in the manufacturing of critical components for advanced gas turbines an‎d power plants due to its excellent creep resistance, structural stability at elevated temperatures, an‎d outstan‎ding corrosion resistance. The hot deformation behavior of this alloy is complex an‎d requires precise understan‎ding of processing parameters to ensure defect-free component production. This study aims to investigate the hot deformation behavior, describe the flow characteristics using fundamental equations, an‎d determine the optimal hot working window for this superalloy. Hot compression tests were conducted within the temperature range of 800–1100 °C an‎d strain rates from 0.001 to 0.5 s⁻¹. True stress–strain curves obtained under various temperatures an‎d strain rates were analyzed. The hot flow behavior was successfully modeled using the Zener–Hollomon parameter (Z) an‎d the Arrhenius-type constitutive equation. Results indicated a significant decrease in flow stress with increasing temperature an‎d decreasing strain rate. The activation energy (Q) for hot deformation of Inconel 617 under these processing conditions was calculated to be 477 kJ/mol, indicating the alloy’s high resistance to deformation. Microstructural analyses confirmed that the dominant softening mechanisms during deformation were dynamic recovery (DRV) an‎d, under more severe conditions, dynamic recrystallization (DRX). Based on processing map analysis, the optimal hot working domain with the highest power dissipation efficiency was identified in the temperature range of 1000–1100 °C at a low strain rate of 0.001 s⁻¹. This domain provides ideal conditions for achieving uniform microstructure an‎d enhanced workability, an‎d can be directly applied to optimize industrial forming processes such as forging.

سوپرآلياژ اينكونل 617 , آزمايش فشار گرم , منحني‌هاي سيلان , نقشه‌هاي فرآيند

Superalloy Inconel 617 , Hot Compression Test , Flow Curves , Processing Maps

AhmadReza MohammdSaeidi

Dr. Bagher MohammadSadeghi