Influence of Crystal Structure of Nitride Compound Layer on Torsion Fatigue Strength of Alloy Steel
Abstract
:1. Introduction
2. Materials and Methods
2.1. Condition of Potential-Controlled Nitriding and Gas Nitrocarburizing
2.2. Compound Layer Removal
2.3. Material Characterization of the Test Specimens
2.4. Fatigue Test Method
3. Results
3.1. Crystal Structure Identification of Compound Layer, Vickers Hardness, and Residual Stress at Surface Layer
3.2. Fatigue Test Results
3.3. Observation of Fatigue Cracks and Fractures
4. Discussions
5. Conclusions
- (1)
- The crystal structure and presence of the nitride compound layer did not affect the torsional fatigue limit because the origin of the torsional fatigue failure is inside the specimen.
- (2)
- It was found that the fatigue life is extended by changing the crystal structure of the compound layer from ε (HCP) to γ’ (FCC).
- (3)
- The presence or absence of the compound layer affected the torsional fatigue life because the compound layer suppressed Mode II crack propagation.
- (4)
- It was found that the failure origin can be estimated from the relationship between the predicted fatigue limit and applied stress distribution.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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C | Si | Mn | P | S | Ni | Cr | Mo | |
---|---|---|---|---|---|---|---|---|
SCM435 | 0.35 | 0.23 | 0.7 | 0.021 | 0.017 | 0.08 | 1.07 | 0.18 |
Method | ε-Fe2–3N | γ’-Fe4N | α-Fe |
---|---|---|---|
Characteristic X-ray | Cr-Kα | ||
Diffraction plane | (1,0,3) | (2,2,0) | (2,1,1) |
Stress constant (MPa/deg) | −611 | −611 | −318 |
Specimen | Maximum Compressive Residual Stress (MPa) | |
---|---|---|
Compound Layer | Diffusion Layer | |
γ’ | 701 | 288 |
ε | 557 | 288 |
γ’-p | - | 660 |
ε-p | - | 641 |
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Yamada, Y.; Hirohito, E.; Takahashi, K. Influence of Crystal Structure of Nitride Compound Layer on Torsion Fatigue Strength of Alloy Steel. Metals 2019, 9, 1352. https://doi.org/10.3390/met9121352
Yamada Y, Hirohito E, Takahashi K. Influence of Crystal Structure of Nitride Compound Layer on Torsion Fatigue Strength of Alloy Steel. Metals. 2019; 9(12):1352. https://doi.org/10.3390/met9121352
Chicago/Turabian StyleYamada, Yoshitomi, Eto Hirohito, and Koji Takahashi. 2019. "Influence of Crystal Structure of Nitride Compound Layer on Torsion Fatigue Strength of Alloy Steel" Metals 9, no. 12: 1352. https://doi.org/10.3390/met9121352