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Effect of manganese and titanium on wear behavior of high chromium cast iron

Auteurs : A. HADJI, H. MAOUCHE
Année : 2016
Domaine : Sciences des matériaux
Type : Communication
Conférence: JEFE 2016
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : Chromium cast iron, carbides, wear, eutectic, secondary precipitation

Résumé :

High chromium white cast irons are widely used in cement works, mining, and other industrial fields. They are specific group of materials, which characterize themselves high resistance on abrasive and other type of wear. The aim of this work is to enhance wear resistance by adding carbide forming elements (Ti, Mn) in order to provide proeutectic MC type carbides and secondary precipitation in the matrix. The master alloy is a 15% Cr heat treated white cast iron used in mill balls production. Amounts of manganese was varied in the ranging of 0.5-3% but titanium was combined with manganese as 0.5%(Mn+Ti). Investigations were carried out on heat treated industrial samples by using optical microscope, MEB, X ray diffraction and wear tests. Results show that the microstructure is composed of netted eutectic embedded in a martensitic matrix. A fine secondary precipitation is clearly shown on the matrix of MEB microstructures. Wear tests indicate that the 3% Mn alloyed high chromium cast iron exhibited the best abrasion resistance but a best friction resistance is given by the 0.5 % (Mn+Ti) alloyed chromium cast iron.