Study on Wear Resistance Property of Multi-Component White Cast Irons
Date Issued
2012
Date
2012
Author(s)
Hsueh, Hsiao-Tze
Abstract
Multi-component white cast irons have been used extensively in the fields that require high wear resistance property, such as rolls for steel rolling process, and crushing rolls, hammers, digging teeth in crushing equipments. In this study, a base alloy composition of Fe-2%C-5%Cr-5%Mo-5%V-5%Co-X%W was selected and the effect of W content (2% and 5%), together with the influence of heat treatment condition (austenitization temperature, tempering temperature and time), on the microstructure and wear resistance property were evaluated.
The as-cast microstructures of both alloy A (2.1%C-5%W) and alloy B (2.1%C-2%W) contain eutectic carbides of MC and M2C in an austenitic matrix. The eutectic carbides remain unchanged during the subsequent austenitization, quenching and tempering treatments, except that secondary carbides in M3C form were precipitated in the matrix. On the other hand, the as-cast austenitic matrix was transformed to martensite after quenching, which in turn was transformed to tempered martensite after tempering. The macro-hardnesses of both alloys increase first, reach a peak, then decreases as the tempering temperature increases, with the peak hardness occurring at 525oC for alloy A and 450oC for alloy B.
Regarding the erosion wear resistance, alloy A exhibits the best resistance at the tempering temperature of 525oC, while 570oC for alloy B. On the other hand, the best abrasion wear resistance took place at 450oC for alloy A and 570oC for alloy B. The results indicate that no clear correlation between alloy hardness and wear resistance property was obtained. In addition, alloy B (2%W) exhibits better wear resistance property (both erosion and abrasion) than alloy A (5%W) in the tempered state, indicating that a reduced W content can achieve an increased resistance to both erosive and abrasive wear. And, the corresponding optimal heat treatment conditions are：Austenitization 1100oC-70min/Oil quench/Tempering 570oC-2hr.
Subjects
Multi-component white cast iron
Heat treatment
Erosion wear
Abrasion wear
Type
thesis
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