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7406 |
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Thursday, May 05, 2022, Hall -2.32/33 10:20 AM Metal Coatings I |
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On the applicability of thermally sprayed iron-based alloys for different wear conditions |
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Tommi Varis* / Tampere University, Finland Juha Lagerbom / VTT Technical Research Centre of Finland Ltd, Finland Tomi Suhonen/ VTT Technical Research Centre of Finland Ltd, Finland Sakari Terho/ Tampere University, Finland Jussi Laurila/ Tampere University, Maisa Virtanen/ Tampere University, Finland Petri Vuoristo/ Tampere University, Finland |
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Iron-based coatings are often considered as replacement of hard chromium and WC-Co, as they pose lower health and environmental impact. In many cases the combination of mechanical and chemical properties of ferrous based alloys may be satisfactory and their relatively low cost make these coatings an interesting candidate for many applications. This study is inspired by opportunities to harden the ferrous base materials by strain hardening, solid solution strengthening, dispersion strengthening, and precipitation hardening. Already commercially available Fe-based coating materials with precipitates of mixed carbides and borides in the metastable austenitic matrix achieve a high hardness. In this study the cavitation erosion and abrasion resistance of various Fe-based coatings produced by HVAF and HVOF processes were investigated. Two experimental precipitation containing materials were prepared, and the sprayed coatings were tested for abrasive and cavitation erosion wear. In addition to precipitations, the importance of proportion of martensitic and retained austenite phases were studied by affecting the micro-structure by heat treatments because the ability of different phases to affect hardening and ductility may become crucial in generating desired material properties. The properties of experimental iron-based alloys and some commercial alloys are compared with WC-Co and Cr3C2-NiCr coatings. |