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Lacaze J.,ENSIACET | Larranaga P.,Area de Ingenieria y Procesos de Fundicion | Asenjo I.,Area de Ingenieria y Procesos de Fundicion | Suarez R.,Area de Ingenieria y Procesos de Fundicion | Sertucha J.,Area de Ingenieria y Procesos de Fundicion
Materials Science and Technology | Year: 2012

Two sets of ductile irons with and without Ni additions containing various low Si contents have been prepared in order to study the effect of Ni on structural and mechanical properties of thermal analysis cups and standard keel blocks. Because contradictory results appearing in literature, this work has been focused on the influence of this element on matrix structure and on impact properties at room temperature as well as at low temperatures. The structures of Ni free and Ni bearing alloys have been related to the features of cooling curves recorded on both casting types and to the tensile and impact properties of the materials. © 2012 Institute of Materials, Minerals and Mining. Source


Suarez R.,L.E.S.S. | Gutierrez J.M.,Area de Ingenieria y Procesos de Fundicion | Alonso G.,Area de Ingenieria y Procesos de Fundicion | Sertucha J.,Area de Ingenieria y Procesos de Fundicion
70th World Foundry Congress 2012, WFC 2012 | Year: 2012

The available simulation tools focused to predict the appearance of microshrinkages are normally useful for designing works but are not effective enough when considering the processing variables deviations. In the present paper an innovative calculation model which considers a recent knowledge about solidification of ductile iron alloys is presented. As a result of this, a new simplified methodology has been developed which can be used to predict rapidly the formation of microshrinkages taking into account the casting geometry and the variation of melt quality during the production processes. The application of this new methodology in foundry plants is oriented to control the formation of contraction defects incastings on real time by means of a new rapid simulation tool. Copyright 2012 World Foundry Congress. Source

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