Abstract
In this work, the effects on dry wear behavior of cold ring rolling (CRR) of GCr15 bearing steel, after quenching and tempering (QT) heat treatment are investigated. The effects on steel microstructures and wear mechanisms of CRR with different austenitizing times are also discussed. The results show that, with a short austenitizing time of 10 min, CRR can increase the retained austenite content, decrease the undissolved carbide content and improve the hardness of the specimen, thus reducing ploughing and fatigue flaking, and decreasing the wear loss of the CRR specimen. With the longer austenitizing time of 20 min, the retained austenite content increases, the undissolved carbide content decreases, and the hardness increases significantly, both in specimens with and without CRR, so that ploughing, fatigue flaking, and wear loss can all be decreased. However, with an austenitizing time of less than 20 min, the effects of CRR on retained austenite content, undissolved carbide content, and hardness are not significant. Thus, CRR of less than 20 min cannot further improve wear morphology or decrease wear loss.
Highlights
GCr15 bearing steel is a key, widely used material in the manufacture of bearings in the automotive and aeronautic fields [1]
This can be ascribed to the austenitizing time, severe plastic deformation and fatigue flaking can both be found in the specimens slight differences in microstructure and hardness between the Blank/20 and cold ring rolling (CRR)/20 specimens
This work focuses on the effect of CRR on wear resistance of GCr15 bearing steel after quenching and tempering (QT) with
Summary
GCr15 bearing steel is a key, widely used material in the manufacture of bearings in the automotive and aeronautic fields [1]. Cold ring rolling and quenching-tempering are the main processes in bearing ring manufacture that directly influence the final microstructure. The effect of pre-cold deformation and its interaction with heat treatment on the microstructures and corresponding mechanical properties has attracted much attention. Pre-cold deformation could influence the phase transformation behaviors during the subsequent QT process, leading to various mechanical properties. Martensitic quenching and tempering are generally used in spheroidizing GCr15 bearing steel to obtain multiphase microstructures with tempered martensite, retained austenite and carbides [15]. The evolution of microstructure caused by CRR during the quenching-tempering process is complicated, and the corresponding effects on the wear behavior of GCr15 bearing steel are still unclear. The effect of CRR on microstructure evolution and wear behaviors during the austenitizing process were studied. The variations in phase content and morphology of carbides after quenching and tempering were quantified, and the wear behavior and corresponding morphologies of wear scar and microstructure changes were analyzed
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