Statistical study to determine the effect of carbon, silicon, nickel and other alloying elements on the mechanical properties of as-cast ferritic ductile irons

Abstract

ABSTRACT:There is a great interest in fully ferritic ductile irons due to their structural homogeneity, remarkable ductility and good response when machining. On the other hand the wide variety of raw materials available in foundry plants becomes a problem when controlling the chemical composition of the manufactured alloys. The present work shows a statistical study about the effect of different C, Si, Ni contents and other minor elements on structural and mechanical properties of a group of ferritic ductile iron alloys. A set of equations are finally presented to predict room temperature mechanical properties of ferritic ductile irons by means of their chemical composition and pearlite content. KEYWORDS:As-cast ferritic ductile cast irons; Carbon; Mechanical properties; Nickel; Silicon Citation / Cómo citar este artículo: Lacaze, J., Sertucha, J., Larrañaga, P., Suárez, R. (2016) "Statistical study to determine the effect of carbon, silicon, nickel and other alloying elements on the mechanical properties of as-cast ferritic ductile irons". Rev. Metal. 52 (2):e070. doi: http://dx.doi.org/10.3989/revmetalm.070. RESUMEN: Influencia del carbono, silicio, níquel y otros elementos de aleación sobre las propiedades mecáni-cas de la fundición con grafito esferoidal en bruto de colada.Las fundiciones con grafito esferoidal de matriz totalmente ferrítica tienen gran interés debido a su homogeneidad estructural, alargamiento destacable y su buena respuesta frente a las operaciones de mecanizado. Por otro lado, la extensa variedad de materias primas disponibles en las plantas de fundición supone un problema a la hora de controlar de forma efectiva la composición química de las aleaciones preparadas. En este trabajo se ha realizado un estudio estadístico sobre la influencia de los diferentes contenidos de carbono, silicio, níquel y de otros elementos minoritarios sobre las características estructurales y las propiedades mecánicas de un grupo de fundiciones con grafito esferoidal y matriz ferrítica. Finalmente, se han obtenido un número de ecuaciones que permiten predecir las propiedades mecánicas a temperatura ambiente de estas fundiciones en función de su composición química y su contenido de perlita en la matriz metálica.

Influence of Heat Treatment in the Microstructure of a Joint of Nodular Graphite Cast Iron when Using the Tungsten Inert Gas Welding Process with Perlitic Grey Cast Iron Rods as Filler Material

“…Their classification depends on its metallographic structure, according to the percentages of carbon and other alloying elements. Although these materials do not have the mechanical properties of steels, they are used in numerous applications such as: hydraulic valves, transmissions, gears, nuts, shafts, hydraulic components, pistons, guides or engine liners [1].…”

Optimización microestructural de fundiciones grises dúctiles no aleadas, con matriz ferrítica, empleadas en la fabricación de bujes de aerogeneradores

“…These mechanical properties are a result of the microstructure of the material (Pan et al, 2012). For this reason, the requirements of these manufacturers include a volume fraction of pearlite lower than 5%, in addition to a spheroidal morphology in the primary graphite (Lacaze et al, 2016). Recent studies have shown that factors such as graphite morphology and the number of graphite nodules per unit area have a significant effect on the in-service behaviour of the material, especially its fatigue strength (Shiraki et al, 2016).…”