سال انتشار: ۱۳۹۱

محل انتشار: اولین همایش بین المللی و ششمین همایش مشترک انجمن مهندسی متالورژی ایران

تعداد صفحات: ۴

نویسنده(ها):

Ahmad Ghasemi Kahrizsangi – University of Tehran
Seyed Farshid Kashani-Bozorg – University of Tehran

چکیده:

In this study, the almost new processing technique, friction stir processing (FSP) was employed to produce nanocomposite surface layers on mild steel. Nano-sized TiC particulates were introduced to the stir zone by means of a pre-made groove. A tungsten carbide tool was used to plasticize the mild steel substrate. The process transformed the original pearlite microstructure to acicular-type ferrite, resulting in significant increase in surface hardness. This surface hardening produced a significant benefit for friction and wear behavior of the steel as measured by unidirectional sliding pin-on-disk testing. Under sliding, FSP reduced friction coefficient and wear rate and increase wear properties about four times more than that of the as-received mild steel. The surface nano-composite layer produced by four FSP passes showed superior wearresistance; this is attributed to its greater micro hardness value (due to presence of finer matrix grains and uniform dispersion nano-sized TiC particles