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Microstructure and tribological characteristics of aged Co–28Cr–5Mo–0.3C alloy
Highlights ► Microstructure and tribological characteristics of Co–Cr–Mo alloy were investigated. ► Lamellar-type carbides in aged sample at lower applied loads improved wear resistance. ► Increasing in applied load showed better wear properties in as-cast microstructure.
Abstract In this study, an attempt to investigate the role of isothermal aging on the microstructure and tribological characteristics of Co–28Cr–5Mo–0.3C alloy was made. Regarding the results, isothermal aging at 850°C and 950°C for at least 16h contributed to the formation of lamellar-type carbides at the grain boundary regions. Moreover, at higher aging times (over 16h), the amount of lamellar-type carbides decreased. The wear properties of as-cast and heat treated samples were determined at 0.5ms−1 speed several under normal applied loads such as 50, 80, and 110N. At the lowest applied load (50N), the samples were isothermally aged at 850°C for 8 and 16h and also the ones were aged at 950°C for 16h had higher wear resistance probably due to more volume fraction of lamellar-type carbides when compared to as-cast and the other aged samples, but, at higher applied loads (80 and 110N) due to the formation of adhesive oxide layer on the as-cast sample surface, the wear rate of as-cast samples is lower compared with all heat treated ones.
Microstructure and tribological characteristics of aged Co–28Cr–5Mo–0.3C alloy
Highlights ► Microstructure and tribological characteristics of Co–Cr–Mo alloy were investigated. ► Lamellar-type carbides in aged sample at lower applied loads improved wear resistance. ► Increasing in applied load showed better wear properties in as-cast microstructure.
Abstract In this study, an attempt to investigate the role of isothermal aging on the microstructure and tribological characteristics of Co–28Cr–5Mo–0.3C alloy was made. Regarding the results, isothermal aging at 850°C and 950°C for at least 16h contributed to the formation of lamellar-type carbides at the grain boundary regions. Moreover, at higher aging times (over 16h), the amount of lamellar-type carbides decreased. The wear properties of as-cast and heat treated samples were determined at 0.5ms−1 speed several under normal applied loads such as 50, 80, and 110N. At the lowest applied load (50N), the samples were isothermally aged at 850°C for 8 and 16h and also the ones were aged at 950°C for 16h had higher wear resistance probably due to more volume fraction of lamellar-type carbides when compared to as-cast and the other aged samples, but, at higher applied loads (80 and 110N) due to the formation of adhesive oxide layer on the as-cast sample surface, the wear rate of as-cast samples is lower compared with all heat treated ones.
Microstructure and tribological characteristics of aged Co–28Cr–5Mo–0.3C alloy
Zangeneh, Sh. (Autor:in) / Lashgari, H.R. (Autor:in) / Roshani, A. (Autor:in)
28.12.2011
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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