Transactions of Materials and Heat Treatment

Title：Constitutive relationship of IN690 superalloy deformation at high temperature

Authors： Wang Zhongtang Zhu Enxin Fu Hefeng

Unit： Shenyang Ligong University

KeyWords： IN690 superalloy constitutive relationship flow stress hot deformation

ClassificationCode：

year,vol(issue):pagenumber：2015,40(1):108-112

Abstract：

Equal strain compression experiment of flow stress on IN690 superalloy at high temperature was conducted by Gleeble-3800 hot simulator with the temperature from 1000 to 1200 ℃，strain rate from 1 to 80 s-1 and maximum plastic deformation of 70%. The relationship between flow stress and technological parameters was analyzed. The obtained experimental data was processed based on Arrhenius equation and the constitutive relationship of IN690 superalloy was constructed. The results of error analysis show that the maximum relative error is 18.1% and the average relative error is 8.2% of the constitutive，which presents better precision and can be applied to practice. Meanwhile, the stress exponent and activation energy etc. are also gained by linear regression method, which provide a reference for numerical simulation of forging process of IN690 superalloy.

Funds：

国家自然科学基金重点资助项目（50834008）

王忠堂（1962-），男，博士，教授

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