34 - Understanding and Control of Remote Area Shrinkage in Ductile Iron

Abstract:

This report summarizes the results of an investigation into the relationship between shrinkage and process variables, microstructure, and thermal analysis parameters in ductile iron castings. The most important process parameters to reduce or eliminate the formation of remote area (un-fed) shrinkage were determined. The main aim of this research work was to study metallurgical factors (such as pre-treatment, alloy treatment and post treatment of the iron melts) related to shrinkage. The effect of molding factors and casting geometry were beyond the scope of this work. Most of the observations on shrinkage were made on an unfed boss-plate casting. Carbon content was kept constant.