Abstract
In this paper, the fretting wear properties of 20CrMnTi steel, a common material for a rocker bracket, was discussed for the first time after it was suffered carburizing treatment. Subsequently, the fretting wear behaviors of virgin, quenched, and carburized states were studied. The effect of loads (corresponding to different engine power output) and reciprocating frequencies (corresponding to different engine speed) on wear behaviors and mechanisms of carburized specimen were further discussed. The results showed that the coefficient of friction (CoF) and wear volume loss (WVL) of the carburized specimens were significantly lower than that of virgin and quenched states. During the wear test, the surface CoF decreased gradually with the increase of applied load, while the linear correlation trend was not observed with the increase of fretting frequency as it showed an increase first and then a decrease. It was observed that the WVL increased gradually with the increase of load and frequency. With an increase of the load, the wear mechanism gradually deteriorated from the initial adhesive wear to the mixed wear mechanism. When the load was high, the oxidative wear became more severe. However, no significant effect of frequency was observed on the wear mechanism.
Highlights
A valvetrain is a mechanism assembly that controls the intake/exhaust of an internal combustion engine, which has a direct influence on the driving stability [1]
The influences of carburizing treatment, applied load, and reciprocating frequency on fretting wear behaviors of 20CrMnTi steel were investigated from the aspects of
The influences of carburizing treatment, applied load, and reciprocating frequency on fretting wear behaviors of 20CrMnTi steel were investigated from the aspects of microstructure, coefficient of friction, wear volume loss, and wear mechanism
Summary
A valvetrain is a mechanism assembly that controls the intake/exhaust of an internal combustion engine, which has a direct influence on the driving stability [1]. A better identification of mechanisms of fretting wear caused by friction between components has become one of the necessary means to enhance engine performance, prolong its service life and improve fuel efficiency. The research [5] intuitively presented the fatigue fracture behavior caused by rocker rocker bracket tribo-pair wear, andand found thatthat thethe friction and wear arm–rocker bracket tribo-pair wear, found friction and wearbehavior behaviorofofrocker rocker arm–rocker arm–rocker bracket interface is mainly manifested as composite fretting wear under the co-action of load and and it isit often neglected artificially. The reaches a sufficient level,level, it will seriously influence thethe transmission wear reaches a sufficient it will seriously influence transmissionofoftorque torqueand and make make the intake/exhaust valves work slowly, reducing the engine efficiency and service life of driving fracture of of the the rocker rocker bracket
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