توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Tribological studies of friction stir processed steel alloy st14
نویسنده(ها): ،
اطلاعات انتشار: دومین همایش بین المللی و هفتمین همایش مشترک انجمن مهندسی متالورژی ایران و انجمن ریخته گری ایران، سال
تعداد صفحات: ۶
Friction stir processing (FSP) was applied to st14 steel as a way to enhance the near–surface material properties. Tungsten–carbide alloy tool was used for processing at a rotating speed of 630 rpm, normal force of 5kN and an advancing speed of 100 mm\s with a tool tilt angle of 3°. All FSP experiments were carried out at room temperature with a single and double pass. Microstructural observations were carried out by employing optical and scanning electron microscopy (SEM) of the cross sections perpendicular to the tool traverse direction. Mechanical properties that include micro–hardness and wear resistance were evaluated in detail. The worn surface of the samples were examined by SEM of the surface composite samples. The high hardness of the processed samples produced significant benefit for friction and wear behavior of steel. The wear resistance of processed samples improved as compared to that of st14 steel.<\div>

۲Microstructure and tribological performance of a steel based Surface Nano composite produced by friction stir processing.
نویسنده(ها): ،
اطلاعات انتشار: دومین همایش بین المللی و هفتمین همایش مشترک انجمن مهندسی متالورژی ایران و انجمن ریخته گری ایران، سال
تعداد صفحات: ۶
This present investigation, was used to produce steel–Fe48Cr18Mo7Nb6C4B16Y1 surface nanocomposite on st14 steel substrate. The Nano structure particles was distribute into the st14 substrate by friction stir processing. High–quality composites were successfully produced with WC tool and tilt angle of 3°.A constant tool rotation rate of 400 rpm and travel speed of 100 mm\min was used. Microstructural analyses showed a uniform distribution of reinforcement particles inside the nugget zone. Microstructure and mechanical properties of samples were investigated by optical microscopy (OM), scanning electron microscopy (SEM), macro–hardness and wear measurements. The smaller grain sizes of the ferrite and reinforcement phase caused increase in hardness and wear resistance within the stir zone. The surface nanocomposites also exhibited lower friction coefficient and wear rate. It was found that the addition of nano structure particles to the st14 matrix alloy affect the mechanism of wear. The results reveals that both the extent of wear and the wear rate are significantly lower in the surfaceNano–composite layer as compared to FSPed matrix and the as–received substrate<\div>
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