The Evolution of Fretting Wear Behavior and Damage Mechanism in Alloy 690TT with Cycle Number
1
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
2
Nuclear and Radiation Safety Center, Beijing 102401, China
3
Frontier Research Initiative, New Industry Creation Hatchery Center, Tohoku University, 6-6-10, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(10), 2417; https://doi.org/10.3390/ma13102417
Received: 3 May 2020
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Revised: 18 May 2020
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Accepted: 22 May 2020
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Published: 25 May 2020
(This article belongs to the Special Issue Tribology: Friction and Wear of Engineering Materials)
The evolution of fretting wear behavior and damage mechanism in Alloy 690TT with cycle number was investigated via laser scanning confocal microscopy (LSCM), scanning electron microscopy (SEM), focus ion beam (FIB), and transmission electron microscopy (TEM). The results showed that the fretting running status underwent a transition from partial slip and mixed stick-slip to final gross slip with the transformation of Ft–D curves from the ellipse to the parallelogram. The coefficient of friction (COF) experienced three drops throughout the fretting process, which indicated the transformation from high-friction wear to low-friction wear. The first drop was due to the transition from two-body to three-body contact. The second and third drops were mainly related to the evolution of the glaze layer from a localized distribution to completely covering the whole contact surface. The competition between fretting induced fatigue cracking (FIF) and fretting induced wear (FIW) ran through the entire fretting wear process. Before the 1.2 × 104th cycle, the fatigue crack growth was faster than wear, and FIF won the competition. As the fretting cycle continued to increase, the wear velocity was obviously faster than that of FIF, which indicated that FIW defeated FIF. The tribologically transformed structure (TTS) participated in the competition between FIF and FIW. The gain boundaries and dislocations in the TTS were a suitable pathway for crack initiation and propagation and oxygen permeation.
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Keywords:
fretting running status; fretting induced fatigue; fretting induced wear; Alloy 690TT; glaze layer; TTS; cycle number
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MDPI and ACS Style
Xin, L.; Han, Y.; Ling, L.; Zhang, W.; Lu, Y.; Shoji, T. The Evolution of Fretting Wear Behavior and Damage Mechanism in Alloy 690TT with Cycle Number. Materials 2020, 13, 2417. https://doi.org/10.3390/ma13102417
AMA Style
Xin L, Han Y, Ling L, Zhang W, Lu Y, Shoji T. The Evolution of Fretting Wear Behavior and Damage Mechanism in Alloy 690TT with Cycle Number. Materials. 2020; 13(10):2417. https://doi.org/10.3390/ma13102417
Chicago/Turabian StyleXin, Long, Yongming Han, Ligong Ling, Weidong Zhang, Yonghao Lu, and Tetsuo Shoji. 2020. "The Evolution of Fretting Wear Behavior and Damage Mechanism in Alloy 690TT with Cycle Number" Materials 13, no. 10: 2417. https://doi.org/10.3390/ma13102417
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