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5266 |
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Friday, June 09, 2017, Hall 26 10:00 AM Characterization & Testing Methods II |
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Influence of alloying elements on properties of arc sprayed Fe-C-Cr-B-Al Ycoatings from cored wires |
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Yury Korobov* / Ural Federal University, Russian Federation Valentin Shumiakov / Ural Federal University, Russia Michael Filipov/ Ural Federal University, Russia Alex Makarov/ Ural Federal University, Russia Irina Malygina/ Ural Federal University, Russia S. Nevezhin/ Ural Federal University, Russia Roman Savrai/ Ural Federal University, Russia Natalia Soboleva/ Ural Federal University, Russia Galina Tkachuk/ Ural Federal University, Russia |
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Arc sprayed coatings from Fe-Cr-B-Y cored wires additionally alloyed by Al, Si, C were studied. SEM and XRD analyses, microhardness characterized their morphology, microstructure, and phase composition.The coatings werealso evaluated by two-body abrasive wear test, and heat resistance test in air, 700°C, 100 h. Among compared coatings, the Cr12B5Al5Y onewith maximum Al and minimum C content showed better indicators of porosity, adhesion strength, wear- and heat resistance comparing to other coatings alloyed with Si or less content of Al.It is resulted from the largest quantity of the carbon enriched eutecticcontaining reinforcing carboboride phases (Fe, Cr)2B, Fe2(C, B), and a rational ratio of the alloying elements. As shown, Cr12B5Al5Y coatingwear resistance is more than twice as high comparing to thecoating from typical wear resistant 150Cr8Ti2Al cored wire. The latter one consists of martensite phase, forming from the metastable austenite during loading, and chromium carbides. Weight loss tests showed that coatings from studied Fe-Cr-B-Y cored wires are of the same heat resistance level as the austenite steels and 1-2 orders of magnitude higher as compared to the pearlite and ferrite-martensitic steels, which are widely used as boiler's materials. |