High-Temperature Tribological Behavior and Wear Mechanisms of Stellite 6 Alloy.
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| Title: | High-Temperature Tribological Behavior and Wear Mechanisms of Stellite 6 Alloy. |
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| Authors: | Jiang, Kai1 (AUTHOR), Lu, Hongbin2 (AUTHOR) lhb20011020@163.com, Chen, Weijie2,3 (AUTHOR), Sun, Fei1,2 (AUTHOR), Luo, Zhe2,3 (AUTHOR), Gu, Xiaomeng3 (AUTHOR) guxiaomeng2012@126.com |
| Source: | Materials (1996-1944). Jun2026, Vol. 19 Issue 12, p2629. 16p. |
| Subjects: | Temperature effect, Sliding wear, Mechanical wear, Tribology, Sliding friction, Alloys, Oxide coating |
| Abstract: | The temperature-dependent wear behavior of a cobalt-based Stellite 6 alloy was investigated from room temperature (RT) to 800 °C using high-temperature reciprocating sliding tests. The friction coefficient decreases monotonically with increasing temperature, from about 0.56 ± 0.12 at RT to 0.26 ± 0.11 at 800 °C, whereas the wear rate exhibits a pronounced non-monotonic evolution. Specifically, the wear rate increases from 18.4 ± 1.5 × 10−6 mm3·N−1·m−1 at RT to a maximum of 54.8 ± 1.6 × 10−6 mm3·N−1·m−1 at 600 °C, followed by an anomalous reduction to 10.2 ± 1.5 × 10−6 mm3·N−1·m−1 at 800 °C, which is even lower than that at RT. Microstructural and elemental analyses indicate that this behavior is governed by the temperature-dependent evolution of oxide layers. At RT–600 °C, thin and mechanically unstable oxide films repeatedly form and fracture, promoting oxidation-assisted abrasive and adhesive wear. In contrast, at 800 °C, a continuous and dense oxide layer forms and acts as a stable tribo-oxide film, effectively suppressing severe material removal. These findings clarify the temperature-driven wear mechanism transition of Stellite 6 alloy under high-temperature sliding conditions. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The temperature-dependent wear behavior of a cobalt-based Stellite 6 alloy was investigated from room temperature (RT) to 800 °C using high-temperature reciprocating sliding tests. The friction coefficient decreases monotonically with increasing temperature, from about 0.56 ± 0.12 at RT to 0.26 ± 0.11 at 800 °C, whereas the wear rate exhibits a pronounced non-monotonic evolution. Specifically, the wear rate increases from 18.4 ± 1.5 × 10−6 mm3·N−1·m−1 at RT to a maximum of 54.8 ± 1.6 × 10−6 mm3·N−1·m−1 at 600 °C, followed by an anomalous reduction to 10.2 ± 1.5 × 10−6 mm3·N−1·m−1 at 800 °C, which is even lower than that at RT. Microstructural and elemental analyses indicate that this behavior is governed by the temperature-dependent evolution of oxide layers. At RT–600 °C, thin and mechanically unstable oxide films repeatedly form and fracture, promoting oxidation-assisted abrasive and adhesive wear. In contrast, at 800 °C, a continuous and dense oxide layer forms and acts as a stable tribo-oxide film, effectively suppressing severe material removal. These findings clarify the temperature-driven wear mechanism transition of Stellite 6 alloy under high-temperature sliding conditions. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961944 |
| DOI: | 10.3390/ma19122629 |
