Abstract
Model has been for proposed for estimating the wear rate in dual phase (DP) steel for the run-in and the steady state of wear based on estimated load sharing between the constituent phases i.e., ferrite and martensite. The model has been checked by conducting pin-on-disc sliding wear tests on DP steel, Armco (pure) iron and fully martensitic steel (FMS) samples at normal loads of 14.7, 19.6, 24.5, 29.4 and 34.3 N and at a fixed sliding velocity of 1.15 m/s. Armco iron and FMS simulate the constituent phases in DP steel i.e., ferrite and martensite. The wear rates predicted by the proposed model have been found to match well with the experimentally observed wear rates in the regime of lower loads for the steels containing relatively lower volume fraction of martensite. However, wear rates have increasingly larger difference at higher loads. The difference in the estimated and the observed wear rates has been attributed to the flow of the softer phase of ferrite over the hard martensite islands and its relatively higher rate of wear.
Highlights
Wear Behaviour of a system is governed by atmosphere, external variables and mating material selection
No such models are available for dual phase (DP) steels which is a typical two-phase material consisting of hard martensite islands embedded in a relatively softer phase of ferrite
Few studies have been conducted to analyze the tribological potential of DP steels and a model for oxidational wear has been proposed by the authors [10] to investigate the wear behavior of DP steel by modifying the models of Archard’s [11] and Quinn [12]
Summary
Wear Behaviour of a system is governed by atmosphere, external variables and mating material selection It needs to be fully understood before developing any theoretical model. The wear of materials involving two or multiple phases has been studied by several researchers [l-4, 6] and several models have been proposed for estimation of wear rates [3, 7,8,9]. No such models are available for dual phase (DP) steels which is a typical two-phase material consisting of hard martensite islands embedded in a relatively softer phase of ferrite.
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