Abstract
This paper investigates the effect of temperature (between 24°C and 450°C) on the wear rate and friction coefficient of a high strength alloy steel (Super-CMV) in gross sliding fretting in air. It was found that whilst there was significant loss of material from the contact during fretting at room temperature, the overall loss of material from the contact had become negative even with a modest increase in temperature to 85°C. At temperatures greater than 85°C, negative wear was maintained, with the coefficient of friction dropping monotonically with increasing temperature up to 450°C. It is proposed that the changes in wear rate and friction coefficient were due to changes in the way that the oxide particles sintered to form a protective debris bed, with sintering of the oxide debris particles at these low temperatures being promoted by the nano-scale at which the oxide debris is formed.
Highlights
Fretting is the oscillatory motion of two contacting bodies at small displacement amplitudes; the relative motion creates material damage
It can be assumed that the formation of debris beds within a fretting contact depends upon many attributes which are influenced by temperature; a body of research exists which has examined the effects of elevated temperature on the tribology of dry fretting steel contacts [1,2,3,4,5,6]
From the fretting wear testing completed for Super-CMV at temperatures from 24 1C–450 1C in air the following conclusions can be drawn: 1. The fretting wear of SCMV is strongly influenced by temperature and a significant reduction in wear is found between 24 1C and 85 1C
Summary
Fretting is the oscillatory motion of two contacting bodies at small displacement amplitudes; the relative motion creates material damage (which can be broadly classified into wear and fatigue). It can be assumed that the formation of debris beds within a fretting contact depends upon many attributes which are influenced by temperature; a body of research exists which has examined the effects of elevated temperature on the tribology of dry fretting steel contacts [1,2,3,4,5,6]. As the temperature is increased, the wear rate and coefficient of friction (COF) are typically observed to decrease significantly over a relatively narrow range of temperature, commonly referred to as the transition temperature. Similar behaviour is widely reported in the literature relating to reciprocating sliding wear at elevated temperatures [7,8,9,10,11], indicating that changes in mechanisms controlling the contact tribology are not specific to fretting
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