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Open AccessArticle

Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process

School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002, China
School of Materials Science and Engineering, Huazhong University of Science and Technology, and State Key Laboratory of Materials Processing and Die & Mould Technology, Wuhan 430074, China
Authors to whom correspondence should be addressed.
Processes 2019, 7(8), 491;
Received: 1 July 2019 / Revised: 28 July 2019 / Accepted: 29 July 2019 / Published: 1 August 2019
(This article belongs to the Special Issue Process Modeling in Pyrometallurgical Engineering)
PDF [4862 KB, uploaded 8 August 2019]


An in-depth understanding of the flow behaviors of materials deformed at high temperatures is of paramount significance. However, insufficient research on the nickel-based GH4698 alloy has resulted in inaccurate material flow prediction or even cracking in the practical billet opening of GH4698 large forgings. In this study, hot compressions were performed at 950–1150 °C and 0.001–3 s−1. Single-peaked strain-stress curves were obtained under various conditions, owing to dislocation motions in dynamic recrystallizations. The Arrhenius model was formulated to accurately describe the flow stress evolutions and the mean prediction error of the flow stress was 5.90%. Processing maps were constructed at various hot working conditions. It was found that the hot working ability of GH4698 markedly decreased under lower temperatures (950–1080 °C) and higher strain rates (0.1–3 s−1). Optimal thermal processing parameters were suggested. In sum, this study systematically investigated the flow behaviors and hot working ability of GH4698 in isothermal compressions. View Full-Text
Keywords: processing maps; nickel-based alloy; flow behavior; arrhenius equation processing maps; nickel-based alloy; flow behavior; arrhenius equation

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Chen, R.; Xiao, H.; Wang, M.; Li, J. Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process. Processes 2019, 7, 491.

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