Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy
Abstract
:1. Introduction
2. Basic Hypothesis
2.1. General Mechanical Model of the Stretching Process
2.2. Simplified Mechanical Model of the Stretching Process
3. Materials and Methods
3.1. Material and Experimental Procedure
3.2. Pre-Stretching and Tensile Test
3.3. Residual Stress Test
3.4. Nano-Hardness Test
3.5. Microstructure Characterization
4. Results
4.1. Residual Stress
4.2. Microstructure
4.3. Mechanical Properties
5. Discussion
5.1. Effect of Pre-Stretching on Residual Stress
5.2. Effect of Pre-Stretching on Microstructure
5.2.1. Effect of Pre-Stretching on Grain Boundaries
5.2.2. Effect of Pre-Stretching on Precipitation Phase
6. Conclusions
- (1)
- With the increase in the level of pre-stretching, the reduction fraction of residual stress in IN718 alloy increased firstly followed by a decreasing trend. The maximum reduction of 72% was obtained under the condition of 3% pre-stretching level.
- (2)
- The strength of the alloy increases monotonically with the increase in the level of pre-stretching. No obvious changes in the product of strength and elongation of the IN718 alloy were observed when the pre-stretch level was lower than 3%. However, when the pre-stretch level was further increased to 9%, the product of strength and elongation of the alloy decreased significantly to 21.5 GPa%, which is a reduction of almost 17.3%.
- (3)
- After pre-stretching, the content of Σ3 twin boundaries in the IN718 alloy decreased significantly, while that of low-angle grain boundaries increased to a certain extent. In addition, when the pre-stretch level was further increased to 9%, the density of dislocation was increased and coarse rod-shaped precipitates were formed, resulting in a rise of strength.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Elements | Ni | Cr | Fe | Nb | Mo | Al | C | Ti |
---|---|---|---|---|---|---|---|---|
(wt%) | Balanced | 18.90 | 18.60 | 5.10 | 3.06 | 0.45 | 0.04 | 0.90 |
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Zhu, J.; Yuan, W. Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy. Metals 2021, 11, 614. https://doi.org/10.3390/met11040614
Zhu J, Yuan W. Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy. Metals. 2021; 11(4):614. https://doi.org/10.3390/met11040614
Chicago/Turabian StyleZhu, Jiajia, and Wuhua Yuan. 2021. "Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy" Metals 11, no. 4: 614. https://doi.org/10.3390/met11040614