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The Effect of Phosphorus on the Microstructure and Properties of Compacted Graphite (CG) Irons
Authors:G. Torga  S. Allende  K. G. Davis
Affiliation:1. Laboratorio de Entrenamiento Multidisciplinario para la Investigacion Tecnologica (LEMIT), La Plata, Argentina.;2. Foundry Section, MTL/CANMET, Dept of Energy, Mines and Resources, Ottawa, Canada.
Abstract:Abstract

The effect of up to 0.15% phosphorus on the microstructure and mechanical properties of step-block castings made from compacted- graphite iron has been examined. There was no major effect on the microstructure, but two minor effects were observed. First, the higher-phosphorus irons showed a small increase in the amount of carbides and pearlite within the microstructure, but there was no effect on the depth of surface chill. Second, at low magnesium contents the higher-phosphorus irons demonstrated a marked increase in the amount of flake graphite. Phosphorus had no adverse effect on tensile strength, and a reported lowering of tensile elongation at elevated phosphorus content was not found in this work. There was, however, a decrease in Charpy impact toughness at higher phosphorus levels.
Keywords:AUSTEMPERING TRANSFORMATION  SPHEROIDAL GRAPHITE  COMPACTED GRAPHITE  CAST IRON
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