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4871 |
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Wednesday, May 11, 2016, Room 3G 9:40 AM Wear Protection |
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Computational multiscale material tailoring of WC-based thermal spray coatings |
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Tomi Suhonen* / VTT Technical Research Centre of Finland, Finland Tom Andersson / VTT Technical Research Centre of Finland, Finland Anssi Laukkanen/ VTT Technical Research Centre of Finland, Finland Tatu Pinomaa/ VTT Technical Research Centre of Finland, Finland Merja Sippola/ VTT Technical Research Centre of Finland, Finland |
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Factors like matrix properties and carbide volume fraction plays a significant role in mechanical performance of hard metal thermal spray coatings. Bigger volume fraction of carbides hardens the coating thus making it more resilient against wear in sertain situations but at the same time typically making it more brittle. A balance between these two attributes is needed in order for the coating to excel in the different applications. We present a methodology to study and predict the effect of different microstructural features (e.g. carbide volume fraction and size distribution, void frequency etc.) and variation of material properties to the mechanical performance of WC-based coatings. A 3D semisynthetic model is produced on the basis of statistics collected from actual microstructures. In this model volume fractions of different microstrutural features, as well as material properties, are completely freely adjustable, yet keeping the geometrical shapes and size distributions realistic, and their effect on material performance is thus predicted. |