Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Studying the effect of wear caused by corundum abrasive material on the properties and microstructure of austempered ductile iron with additions of Cu and Ni

nr katalogowy: 79727

Austempered ductile iron has a well-established world reputation as a material meeting some specific requirements for the construction of machinery and equipment [1, 2]. High quality of castings, high abrasion wear resistance, the yield strength at a level of 500÷1300 MPa, self-lubricating capability, and the density by about 10% lower than that of steel, make this material highly competitive to the grades used so far. It seems that this material is best used in the agriculture and mining industry [3, 4]. The abrasion wear resistance property can be very important in some special designs. In the case of wear induced by loose abrasive, and this is the wear predominant in the rock and coal mining industry, the abrasion resistance is of particular importance because of a high wear rate of parts operating under extreme conditions, which may result in time consuming and dangerous failures. In such cases the usage of the austempered ductile iron, proven in many of these applications, may turn out to be the long searched solution. In the studies described in this article, an attempt has been made to simulate the abrasion wear, which occurs in a mine, using special test stand designed and made at the Institute of Mining Mechanisation (Fig. 1). Three different types of ductile iron were tested to determine their abrasion wear resistance in a jet of dry corundum abrasive and to investigate what impact this process may have on the ductile iron microstructure and properties. METHODOLOGY The tested material was cast in the form of three Ø60×450 mm rods with the chemical composition as shown in Table 1. The heat treatment process was performed in the Nabertherm furnace, while austempering was carried out in a salt bath at a temperature of 370, 320 and 270°C (Tab. 2). From these castings, samples were cut out for the abrasion test, static tensile test, hardness measurements, and metallographic [...]

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