کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8027307 | 1517620 | 2014 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nanostructured Co-Cr-Fe alloy surface layer fabricated by combination of laser clad and friction stir processing
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Nanostructured Co-Cr-Fe alloy surface layer fabricated by combination of laser clad and friction stir processing Nanostructured Co-Cr-Fe alloy surface layer fabricated by combination of laser clad and friction stir processing](/preview/png/8027307.png)
چکیده انگلیسی
Friction stir processing (FSP) was carried out on a laser clad Co-Cr-Fe alloy layer in order to transform the coarse laser clad microstructure into nanostructure and improve the mechanical properties. In the microstructure of the laser clad Co-Cr-Fe alloy, coarse brittle carbides precipitated along the grain boundary and formed networks, along which micro-cracks tended to initiate. After FSP, nanostructured surface layers with 20-100 nm grain sizes and 30-65 μm thicknesses were obtained. The coarse network carbides were significantly crushed to nanosize particles uniformly distributed in the nanostructured Co matrix. The plastic layer showed a gradient grain size that ranged from tens of nanometers at the top surface to tens of micrometers at the interior. A large number of the deformation nanotwins were found in the plastic zone which revealed the deformation mechanism. Moreover, FSP enabled the closure of micro-cracks in the laser-clad microstructure. The formation of nanostructures increased the hardness up to 819 Hv, compared with the 490 Hv of the laser parent alloy. The friction coefficients of the laser-clad Co alloy decreased from about 0.35 to 0.1-0.2 after FSP, with enhanced wear performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 258, 15 November 2014, Pages 415-425
Journal: Surface and Coatings Technology - Volume 258, 15 November 2014, Pages 415-425
نویسندگان
Ruidi Li, Tiechui Yuan, Zili Qiu, Kechao Zhou, Jinglong Li,