Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior and phenomenological constitutive model for GH3128 alloy

Authors： Yang Bo Wu Shihao Bao Zhennan Yuan Baohui Zheng Kailun

Unit： AECC Shenyang Liming Aero-engine Corporation Ltd． Dalian University of Technology

KeyWords： Ni-based superalloy tensile test thermal deformation phenomenological constitutive model microstructure

ClassificationCode：TH142.2

year,vol(issue):pagenumber：2022,47(5):226-234

Abstract：

The deformation behavior and microstructure evolution law of GH3128 alloy at different temperatures were investigated by room temperature and high temperature tensile tests, respectively, and it was found that the material still had good hardening ability and uniform deformation under the temperature of 1050 ℃ and the strain rate of 1 s-1. Then, two sets of phenomenological constitutive models of GH3128 alloy at room temperature and high temperature were constructed. The room temperature models included Ludwik model, Ludwik simple modified model and Ramberg-Osgood model, and the high temperature models included Fields-Backofen (FB) model and Johnson-Cook (JC) model. The rheological behavior of GH3128 alloy under different temperatures and strain rates was predicted by the built models. The results show that for the room temperature model, Ludwik simple modified model exhibits the highest prediction accuracy, and the absolute values of average error AARE is 3.64%. For the high temperature model, the prediction accuracy of both FB and JC models are limited because the phenomenological constitutive models cannot describe the complex microstructure evolution of GH3128 alloy. Thus, the study on the thermal deformation behavior and phenomenological constitutive model of GH3128 alloy provides effective guidance for the subsequent selection of hot forming process parameters and finite element simulation.

Funds：

作者简介：杨波（1988-），男，硕士，工程师，E-mail：Yangbo19880426@163.com；通信作者：郑凯伦（1988-），男，博士，教授，E-mail：zhengkailun@dlut.edu.cn

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