Correlation of particle impact conditions with bonding, nanocrystal formation and mechanical properties in kinetic sprayed nickel
作者： Gyuyeol Bae , Jae-il Jang , Changhee Lee
DOI: 10.1016/J.ACTAMAT.2012.03.001
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摘要: Abstract Owing to the specific high-strain-rate thermomechanical characteristics of Ni particle impact in kinetic spraying, rebound phenomenon impacting particles hinders formation first layer and impedes successful build-up coating. Even at higher velocities, deposition efficiency coating is quite low because excessive energy, which induces and/or erosion highly flattened particles. This paper reports noticeably improved bonding resulting from suppressed equivalent (von Mises) flow stress enhanced interface heat-up as a result powder preheating. Experimental observations coupled with finite-element modeling (FEM) corroborate fact that thermally softened very effective for adhesive cohesive bonding. Based on FEM results, thermal boost-up zone, increased by accelerated adiabatic shear instability, proposed crucial factor enhancing between particles, essential producing better properties. Moreover, nanocrystal (
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