Fretting Wear Properties of Thermally Deformed Inconel 625 Alloy
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ORIGINAL ARTICLE
Fretting Wear Properties of Thermally Deformed Inconel 625 Alloy Zhi Jia1,2
•
Yanjiang Wang1 • Jinjin Ji3 • Xuan Sun1
Received: 10 May 2020 / Accepted: 31 August 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract The effect of microstructure on fretting wear behavior of Inconel 625 alloy was studied after different thermal deformation conditions (strain rate and temperature). The results show that grain size and microhardness have a significant influence on the fretting wear. As thermal deformation temperature increases and strain rate decreases, grain size increases and microhardness decreases. The oxide formed on the surface of Inconel 625 helps to reduce wear, but oxidative wear is the main wear mechanism. In the thermal deformation temperature range of 900–1000 °C and strain rate of 0.1–1 s-1, grain size is less than 4.5 lm, and the hardness is greater than 252.9 HV. Under these conditions, the coefficient of friction is the highest and the wear volume is the lowest. This paper proposes to improve the fretting wear resistance of the workpiece by adjusting the strain rate and temperature during the thermal deformation process. Keywords Inconel 625 alloy Fretting wear Microstructure Oxidative wear
& Zhi Jia [email protected] 1
School of Material Science and Engineering, Lanzhou University of Technology, No. 287 Langongping Road, Qilihe District, Lanzhou, People’s Republic of China
2
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, No. 287 Langongping Road, Qilihe District, Lanzhou, People’s Republic of China
3
School of Materials Engineering, Lanzhou Institute of Technology, Lanzhou, People’s Republic of China
1 Introduction Inconel 625 alloy is a multi-element highly alloyed nickelbased wrought superalloy. Inconel 625 alloy has been used in the manufacturing of chemical shunt pipes, nuclear power pipes, and gas turbine pipes due to its high abrasion resistance, excellent anti-corrosion, and hot stability [1, 2]. However, due to the fretting wear caused by vibrations from the flow of gas–liquid media in the pipeline, the pipe fitting loosens, reducing sealing performance. Crack initiation and expansion accelerates, and eventually the fatigue strength decreases, leading to catastrophic damage [3–6]. Therefore, the damage caused by fretting wear cannot be underestimated. Due to the relative movement of the contact interfaces, direction and magnitude of the force are constantly changing. The wear behaviors and the mechanisms of the contact interfaces are also extremely varied. Past studies have shown that the third body and tribologically transformed structure (TTS) are strongly related to fretting friction and wear mechanisms. The TTS is generally less than 100 lm. A third material is often coated on the TTS to reduce fretting wear [7–10]. Iwabuchi [11] studied the changes in the fretting COF and wear amount of Inconel 625 under different temperatures and pressures. Lavella et al. [12] described the fretting w
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