Impact of carbide-promoting elements on the mechanical properties of solid-solution-strengthened ductile iron
Tóm tắt
Solid-solution-strengthened ductile iron (SSDI) exhibits a unique combination of strength and ductility due to the fully ferritic matrix and the increased silicon content. Steel scrap is the most important feedstock for this material because of its low cost. Since steel scrap contains carbide-promoting elements whose alloy content is expected to increase in the future, there is a need to study the impact of these elements on the mechanical properties of SSDI. In the present work, EN-GJS-500-14 with 3.8 wt% silicon is alloyed with the carbide-promoting elements chromium, manganese, molybdenum, niobium and vanadium by means of a factorial design of experiment. The mechanical properties are determined in castings of different section sizes to study the impact of solidification time. Quantitative relations are developed via a multiple regression analysis between chemical composition and mechanical properties as well as between microstructure and mechanical properties. The results indicate that chromium and vanadium cause the highest strengthening in SSDI in relation to their alloy content. Tensile strength increases with increasing amount of pearlite and carbides in the microstructure, while all mechanical properties decrease with increasing solidification time.
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