期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 112, 期 7-8, 页码 1941-1950出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-020-06471-8
关键词
High-speed machining; Cutting parameters; Surface integrity; SiAlON ceramic; Inconel 718
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) under the CANRIMT Strategic Research Network Grant [NETGP 479639-15]
The study evaluates the surface integrity of Inconel 718 machined with SiAlON cutting tools at high speeds, showing potentially negative surface effects.
The surface integrity of complex engineering components has a major effect on their mechanical properties. Recently, modern ceramic tools have demonstrated themselves as potential candidates for high-speed machining of heat-resistant superalloys, delivering a substantial increase in productivity. The results of previous studies showed that after surpassing a cutting speed of 800 m/min, the cutting forces experienced a sharp decrease accompanied by a reduction in tool wear. However, in such applications, extreme temperature and mechanical loads are generated at the cutting zone, implying a possible negative influence on the machined surface integrity. In this study, numerous characterizations have been performed to evaluate the different aspects of inconel 718-machined surface integrity after face milling with SiAlON cutting tools at the range of 900 m/min. Since the cutting conditions are remarkably far from those experienced during conventional cutting, the results are also compared to those obtained during conventional milling of inconel with a commonly used commercial coated carbide tool. Results showed that the milling process induces tensile residual stresses as high as 2 GPa on the machined surface while generating an unwanted white layer with a thickness of around 1 mu and a relatively rough surface with R-a = 4.5 mu m as compared to surfaces machined with conventional carbide tools at R-a = 2.2 mu m. No major work-hardening effect was observed. Nevertheless, imperfections were observed to be contained within a thin sub-layer of the workpiece, suggesting that the ceramic tools can be used for roughing processes provided further finishing operations performed to remove the damaged layer.
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