Sliding wear behavior of a ferritic–pearlitic ductile cast iron with different nodule count

• Published in: Wear Vol. 268; no. 3-4; pp. 622 - 628
• Main Authors: Abedi, H.R., Fareghi, A., Saghafian, H., Kheirandish, S.H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 04.02.2010; Elsevier
• Subjects: Applied sciences; Cast iron; Electron microscopy; Exact sciences and technology; Fatigue; Fracture mechanics (crack, fatigue, damage...); Friction, wear, lubrication; Fundamental areas of phenomenology (including applications); Machine components; Mechanical engineering. Machine design; Physics; Sliding wear; Solid mechanics; Structural and continuum mechanics; Three-body abrasion; Fatigue; Three-body abrasion; Sliding wear; Electron microscopy; Cast iron; Heat treatment; Adhesive wear; Wear test; Experimental study; Cast metal; Dry friction; Lapping; Wear rate; Oxidative degradation; Graphite; Wear resistance; ASTM standard; Microstructure; Delamination; Pin disk test; Ductile cast iron; Sliding friction; Tribology
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2009.10.010

The effect of graphite nodule characteristics (nodule count, nodule size and nodularity) on the wear behavior of ductile iron has been the subject of many researches to date to optimize its wear performance. The present work aims to illustrate the effect of nodule count on the sliding wear behavior of a ferritic–pearlitic ductile iron. Different ductile cast iron test samples, from 10 to 50mm in thickness, with the nodule counts varying between 150 and 450nod/mm2, were used. The samples for wear tests were heat treated in order to adjust the matrices to a ferritic–pearlitic microstructure. Wear tests were carried out using a pin-on-disk type apparatus based on ASTM-G99 standard under dry sliding conditions. It was found that the oxidative wear is operative at the lower load while adhesive associated with delamination wear is predominant mechanism at the higher load. Furthermore, at the lower applied loads, the specimens with the high nodule count exhibit lower wear rate than those having the low nodule count, while at the higher loads wear resistance deteriorates with increasing nodule count. The obtained results were discussed based on the effect of nodule count on oxidative, adhesive and delamination wear.