Abstract
The phase transformation in the grinding process could have a significant impact on the processing performance of the products. Although grinding process can lead to high heating and strain rates, the current studies on the phase transformation typically consider temperature only that limits their accuracy. In this study, based on the phase transformation model, by conducting the micro-grinding experiment of maraging steel C250, the mechanism controlling impacts of heating and strain rates on phase transformation has been analyzed, and a new process optimization scheme to control phase transformation has been proposed. In this research was determinate main characteristic parameters of the phase transformation prediction model and influence of the heating rate parameters on the structure of the material. The main conclusions of this work are aimed increasing productivity, as well as criteria for optimizing the micro grinding process are defined.
Highlights
The grinding process is distinct from that of general machining, due to plenty of heat generated between the grinding wheel and the workpiece that induces phase transformations [1] affecting the final microstructure and properties of the material
Phase transformation exerts a significant influence on both residual stress and surface quality of the workpiece
By conducting the micro-hole grinding experiment, the phase transformation ratio was measured under different process parameters, the characteristic parameters of the phase transformation prediction model were determined, and mechanism controlling impacts of heating rate and strain rate on the phase transformation have been analysed
Summary
The grinding process is distinct from that of general machining, due to plenty of heat generated between the grinding wheel and the workpiece that induces phase transformations [1] affecting the final microstructure and properties of the material. During the process of phase transformation, the volume fraction of austenite changes [4], that can affect the microstructure, lead to strain hardening [5], and impact the residual stress of the workpiece [6]. Both phase transformation and residual stress can be effectively controlled by setting proper process parameters [7,8]
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