بررسي خواص لايه هاي سطحي Ni-20WC, Ni-10WC, Ni-5WC روكش كاري شده بر روي فولاد ساده كربني به روش (GTAW)

Investigation of surface layers of 57.5Fe33Cr4C5.5W and 52Fe33Cr4C11W claddings produced by TIG surfacing process

در اين تحقيق چهار نوع پودر Ni و Ni-20W,Ni-10WC, Ni-5WC به كمك روش جوشكاري قوسي تنگستني (GTAW) بر روي سطح فولاد St52 روكش كاري شدند. براي بررسي ساختار متالورژيكي، خواص سايشي و مقاومت به سختي پوشش از تست پراش پرتو X، تست سايش و سختي سنجي استفاده شد. نتايج نشان داد كه فازهاي مورد انتظار در پراش مشخص شدند و همچنين مشخص شد كه با افزايش ذرات WC مقاومت به سايش و سختي نمونه ها به مقدار زيادي افزايش پيدا كرد.

In this study, The effect of W in Fe-Cr-C hardfacing alloys on microstructure and wear performance of the clad layers were investigated using X-ray diffraction analysis, optical and scanning electron microscopy and reciprocating wear tests, respectively.The surface of st52 steel was alloyed with preplaced powders Fe-Cr-C and Fe-Cr-W-C by using a tungsten-inert gas (TIG) heat source. It was found that, by this process, as-deposited coatings had a good appearance and consisted of higher volume fractions of Cr7C3 and WC carbides. The results showed that the micro hardness and wear resistance are increased more noticeably by increasing the W content of the hardfacing alloys.