Experimental Study of Effects of Hydrogen Embrittlement and Residual Stress on Mechanical Properties of GTD450

Document Type : Research Article

Authors

1 Department of mechanical engineering, Faculty of engineering, University of Zanjan, Zanjan, Iran

2 University Professor/ Department of mechanical engineering, Faculty of engineering, University of Zanjan, Zanjan, Iran.

3 PhD student/ Faculty of mechanical engineering, Tarbiat Modares University, Tehran, Iran

Abstract

The subject of the present paper is the experimental study of the effects of hydrogen embrittlement with residual stress on the mechanical properties of GTD450 alloy. Hence, 0.5 M sulfuric acid was used to create one- and two-hour hydrogen charging, and the cylindrical-toothed method was used to generate residual stress. Based on experimental findings, changes in flexibility and percentage of reduction of failure area, compared to the baseline conditions ranged from 42.69% to 74.68% and 11.78% to 39.58%, respectively. The results of statistical analysis have estimated the contribution of residual stress and hydrogen embrittlement to flexibility as 1.15% and 67.05%, respectively. For the residual stress related to the five kN force, by increasing the hydrogen charging to two hours, the toughness value decreases by 60.54%. It was also observed that the maximum change in yield stress is 1.68%, which is caused in the sample by one-hour hydrogen embrittlement and residual stress due to a force of nine kN. In the baseline case, the necking was collapsed with high strain, and the area of failure was reduced by 36%; however, under two-hour charging, failure occurred with a minimum of necking, low strain, and slight reduction of failure area by 21.75%.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 12
March 2022
Pages 5659-5678

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