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논문 기본 정보

자료유형
학술저널
저자정보
Alwin Balasundaram (Indian Institute of Technology-Madras) Aviral Bisht (Indian Institute of Technology-Madras) M. Anantharaman (GE Aviation) Srinivasa R. Bakshi (Indian Institute of Technology-Madras) M. Kamaraj (Indian Institute of Technology-Madras)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.2
발행연도
2024.2
수록면
483 - 500 (18page)
DOI
10.1007/s12540-023-01507-6

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초록· 키워드

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In this work, the effect of double-aging (DA) heat treatment on the microstructure and the tribological behaviour of coldsprayedInconel 718 (IN718) coating was studied and compared with hot-rolled IN718. After double-aging, the dendritestructure of the as-sprayed coating was modified and secondary phases such as γʹ, γʺ, and δ phases were formed. Themicrohardness of the coating improved after double-aging and was higher than the double-aged IN718 due to the leftovermicrostrain in the coating. Sliding wear tests were carried out at room temperature (RT) and 600 °C using a ball-on-disctribometer with alumina balls. The double-aged coating had improved wear resistance than the as-sprayed coating and thedouble-aged substrate at room temperature. At 600 °C, the wear rate of the hot-rolled IN718 was marginally lower than theas-sprayed coating due to the formation of a comparatively thick mechanically mixed layer (MML) reinforced with Al2O3which was more protective in nature. The double-aging treatment improved the wear resistance of the coating significantlyat 600 °C and its wear rate was comparable to that of the double-aged substrate. The substrate and the coating undergo acombination of abrasive and tribo-oxidative wear at RT. At 600 °C, the wear mechanism involves a combination of oxidativeand abrasive modes. Raman analysis revealed that the oxide formed on the wear track consisted of NiO and Fe3O4atRT, and the glaze layer formed during high-temperature wear consisted of a mixture of the NiFexCr2-xO4 spinel and Fe3O4.

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