Novel Tensile Test Jig and Mechanical Properties of WC-Co Synthesized by SHIP and HIP Process
Abstract
:1. Introduction
2. Materials and Methods
2.1. Design of the High-Strength Tensile Jig
2.2. Experiment and Materials
2.3. Finite Element Analysis (FEA)
3. Results and Discussion
4. Conclusions
- A jig for high-strength materials was proposed. The jig can be easily attached and detached to a universal testing machine that is widely used and does not exceed the standard range. Through the FEA results, the validity of the proposed jig could be obtained, and a jig with a stress 0.21 times lower than that in a previous study could be designed;
- As a result of the tensile test with the proposed jig and specimen, the lower the Co content, the higher the modulus and tensile strength and the lower the elongation. It was confirmed that Young’s modulus was improved by HIP treatment. Similar to the tensile test results, the additional hardness test results showed an increasing tensile strength in the order 6 wt.% Co, 10 wt.% Co, and 21.5 wt.% Co. However, as a result of the impact test, 21.5 wt.% Co, which had a low tensile strength but a high strain, had the highest impact energy, and 6 wt.% Co and 10 wt.% Co showed similar results;
- As a result of the microstructure, brittle fracture appeared in all specimens, and the grains were homogeneously distributed. As the Co content increased, Co was attached to the surface of WC, and the WC grains and gaps became coarse and wide;
- Die stress analysis was performed using 6 wt.% Co, which had the highest tensile strength, and the results showed a low displacement, regardless of HIP treatment, which might be suitable for this process.
5. Patents
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Chemical Composition (wt.%) | |||||
---|---|---|---|---|---|
Co | W | C | Fe | Ta | Nb |
6 | 86.83 | 5.81 | 0.00 | 0.70 | 0.66 |
10 | 84.48 | 5.52 | 0.00 | 0.00 | 0.00 |
21.5 | 72.75 | 4.75 | 1.00 | 0.00 | 0.00 |
wt.% Co | Powder Size (μm) | SHIP | HIP | ||
---|---|---|---|---|---|
Maximum Temperature (°C) | Maximum Pressure (MPa) | Maximum Temperature (°C) | Maximum Pressure (MPa) | ||
6 | 0.6–0.9 | 1410 | 6 | 1310 | 98 |
10 | 1.4–2.0 | 1410 | 6 | 1310 | 98 |
21.5 | 5.0–7.9 | 1420 | 0.9 | 1310 | 98 |
Process | wt.% Co | Young’s Modulus (GPa) | Ultimate Tensile Strength (MPa) |
---|---|---|---|
SHIP | 6 | 615 | 2102 |
10 | 532 | 2243 | |
21.5 | 434 | 1680 | |
SHIP + HIP | 6 | 618 | 1952 |
10 | 553 | 2335 | |
21.5 | 497 | 1456 |
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Jo, A.-R.; An, J.-S.; Kim, S.-H.; Jeong, M.-S.; Moon, Y.-H.; Hwang, S.-K. Novel Tensile Test Jig and Mechanical Properties of WC-Co Synthesized by SHIP and HIP Process. Metals 2021, 11, 884. https://doi.org/10.3390/met11060884
Jo A-R, An J-S, Kim S-H, Jeong M-S, Moon Y-H, Hwang S-K. Novel Tensile Test Jig and Mechanical Properties of WC-Co Synthesized by SHIP and HIP Process. Metals. 2021; 11(6):884. https://doi.org/10.3390/met11060884
Chicago/Turabian StyleJo, A-Ra, Ji-Seob An, Sun-Hyung Kim, Myeong-Sik Jeong, Young-Hoon Moon, and Sun-Kwang Hwang. 2021. "Novel Tensile Test Jig and Mechanical Properties of WC-Co Synthesized by SHIP and HIP Process" Metals 11, no. 6: 884. https://doi.org/10.3390/met11060884