Abstract
This study applied various aging treatment (AT) times at 650 °C in Stellite 6 laser cladding layer, conducted the atom-scale characterization of stacking faults (SFs) and nanoscale M23C6 carbides, described the martensitic transformation of γ → ε, and discussed on the growth mechanism of FeCo and M23C6 phases by 3D/2D modeling. Results show the formation of three distinct regions relative to Fe diffusion, namely, interfacial layer with FeCo and M23C6 phases, Fe diffusion-affected zone with FexCoy distribution at the edge of M23C6 carbides along grain boundary, and Fe diffusion-unaffected zone with abundant carbide precipitation and SF generation. In addition, the formation of M23C6 and FeCo phases conformed to dynamics and thermodynamics. Suzuki effect influence the nanoscale carbides with profile and growing direction of [121¯] and [110], respectively, and martensite transformation occurred on (1¯11¯)γ parallel to (0002)ε as characterized by 2D modeling and HRTEM. The microhardness of surfacing layer was measured in diverse zones, and the results present that AT softened the interfacial layers but increased the hardness of Fe diffusion-affected zones and Fe diffusion-unaffected zones.
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