Effect of Copper Addition on Microstructure and Mechanical Properties of Ductile Cast Iron

	Effect of Copper Addition on Microstructure and Mechanical Properties of Ductile Cast Iron
Article 5, Volume 4, Issue 1, June 2024, Page 75-79 PDF (1.6 MB)
Document Type: Original Article
DOI: 10.21608/ijmti.2024.287146.1102
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Authors
Mohamed Mourad¹; Mervat Ibrahim ²; Shimaa El-Hadad ³
¹casting department, CMRDI
²Central Metallurgical Research and Development Institute
³Central Metallurgical R&amp;D Institute
Abstract
This work aims to investigate the influence of Cu addition on the microstructure and mechanical properties of ductile cast iron (DCI). A step-like mold was used to study the evolved microstructures at different cooling rates. It was observed that adding Cu to DCI increased the pearlite content and refined significantly the lamellar structure. This effect was more pronounced at the thicker sections (slower cooling rates). Tensile strength improved obviously with the increase in pearlite content from 550 MPa at 27 % pearlite (0.02 wt.% Cu) to 875 MPa at 83 % pearlite (2.47 wt.% Cu). However, the elongation decreased sharply from 19 to 5 % upon increasing Cu content from 0.02 to 2.47 wt.% at 20 mm thickness. The impact toughness was affected negatively by Cu addition, where the value of toughness decreased from 65 J at 0.02 wt.% Cu to ~17 J at 2.47 wt.% Cu at 20 mm.
Keywords
Ductile iron; Copper; microstructure; tensile strength; Impact toughness
Main Subjects
Metal Casting


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