کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
830765 | 1470360 | 2012 | 12 صفحه PDF | دانلود رایگان |
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 16 h contributed to the formation of lamellar-type carbides at the grain boundary regions. Moreover, at higher aging times (over 16 h), the amount of lamellar-type carbides decreased. The wear properties of as-cast and heat treated samples were determined at 0.5 ms−1 speed several under normal applied loads such as 50, 80, and 110 N. At the lowest applied load (50 N), the samples were isothermally aged at 850 °C for 8 and 16 h and also the ones were aged at 950 °C for 16 h 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 110 N) 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 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.
Journal: Materials & Design - Volume 37, May 2012, Pages 292–303