A simulation model for predicting surface integrity coupled thermal–mechanical effect in turning of Inconel 718 super alloy
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Residual stress as well as microstructure modification in machined surface layer directly influence fatigue performance of difficult-to-machine materials especially for nickel-based super alloy. However, the prediction of these factors still needs deeper study. In the paper, residual stress as well as microstructure modification in machined surface is predicted by a simulation model coupling thermal–mechanical effect. The predictions of FE model are validated by experimental measurements. Through numerical simulation results, the effects of thermal and mechanical loadings are distinguished. Besides, the influence of cutting parameters on the residual stress and microstructure was also obtained. Within the range of experimental parameters, the combination of larger cutting speed and lower feed rate is the recommended optimized selection of cutting parameters to obtain the better surface quality in turning Inconel 718.
KeywordsResidual stress Microstructure Thermal–mechanical loading Inconel 718 Turning
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The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (51425503), and the Major Science and Technology Program of High-end CNC Machine Tools and Basic Manufacturing Equipment (2014ZX04012014). This work was also supported by grant from Taishan Scholar Foundation (TS20130922).
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