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- W2265623571 abstract "Compacted graphite (CG) iron features a goodcombination of tensile strength, impact resistance, thermalconductivity and damping capacity. This combination makes CG iron amaterial of choice for various applications, especially for theautomobile industry. The mechanical properties of CG iron listed inthe standards (i.e. ASTM) are for machined specimens. However,since most iron castings retain the original casting surface(a.k.a. casting skin), the actual performance of the part could besignificantly different from that of the machined specimens. Recentstudies have shown the negative effect of the casting skin, butlittle quantification of its effect on mechanical properties isavailable. Further, the understanding of its mechanism of formationis at best incomplete. In this research, the effect of the castingskin on mechanical properties in CG and ductile irons (DI) isexplored. The differences in tensile and fatigue properties betweenas-cast and machined samples were quantified and correlated to thecasting skin features. It was found that the presence of thecasting skin was accountable for 9% reduction of tensile strengthand up to 32% reduction of fatigue strength (for CG iron with 40%nodularity).Several mechanisms of the casting skin formation areproposed in this research. The formation of ferritic and pearliticrims is explained by decarburizing/carburizing reactions at themold/metal interface. Mg depletion and solidification kineticseffect were identified as the formation mechanisms of the graphitedegradation. A 2-D thermal diffusion model was formulated based onMg depletion theory. The model can be used to predict the castingskin thickness when Mg depletion is the dominant mechanism.Furthermore, using the asymmetric Fe-Gr phase diagram, someinstances of casting skin formation were explained based onsolidification kinetics theory.The experimental microstructuralevidence and the theoretical progress were conducive to thedevelopment of methods for the minimization of the casting skinformation. A serie of experiments was conducted to evaluate theeffect of mold coatings on the casting skin formation. It was foundthat the thermal conductivity of the inactive coatings played animportant role. The results from experiments with FeSi and graphitecoatings supported the proposed mechanisms. FeSiMg was foundeffective in suppressing the casting skin formation. Furthermore,key findings are highlighted including the effect of carbonequivalent (CE) and the effect of section thickness.Shot blastingis suggested as an effective means for the elimination of thecasting skin effect. The removal of the casting skin by shotblasting was observed. In addition, the work hardening created bythe shot blasting can be seen through the plastic deformation onthe sample surface. Both contributed to the improvement of thetensile and fatigue properties." @default.
- W2265623571 created "2016-06-24" @default.
- W2265623571 creator A5028907512 @default.
- W2265623571 date "2013-01-01" @default.
- W2265623571 modified "2023-09-27" @default.
- W2265623571 title "Ductile and Compacted Graphite Iron Casting Skin -- Evaluation, Effect on Fatigue Strength and Elimination" @default.
- W2265623571 hasPublicationYear "2013" @default.
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