High-speed intermittent turning of GH2132 alloy with Si3N4/(W, Ti)C/Co graded ceramic tool
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In this paper, a new Si3N4-based graded ceramic tool was prepared by hot press technology The tool was toughened by microscale (W, Ti)C, nanoscale Si3N4, and metal Co. The graded structure combing with proper composition distribution introduced thermal residual compressive stress into the surface layer of the tool according to the FEM analysis. The performance of the tool in high-speed intermittent turning GH2132 alloy (equivalent to A286) was studied in contrast to one homogeneous tool. The cutting forces analysis indicates that the inserts endure periodic mechanical shock in the intermittent cutting process and the mechanical shock is more serious when the tooth engages the workpiece than when it disengages the workpiece. The tool failure modes observation shows ladder-like fracture under thermal and mechanical shock in the intermittent cutting process. Tool failure mechanisms involve chipping, flaking, microcracks, and adhesion. The graded tool shows better thermal and mechanical shock resistance than the homogeneous tool due to the formation of residual compressive stress.
KeywordsCeramic tools Intermittent cutting Failure mechanisms Superalloys
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This work is supported by the National Natural Science Foundation of China (51805534), the Natural Science Foundation of Jiangsu Province for Youths (BK20170286 and BK20160258), Jiangsu Planned Projects for Postdoctoral Research Fund (1601021B), and the Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD).
- 8.Deng JX, Liu LL, Liu JH, Zhao JL, Yang XF (2005) Failure mechanisms of TiB2 particle and SiC whisker reinforced Al2O3 ceramic cutting tools when machining nickel-based alloys. Int J Mach Tool Manu 45(12–13):1393–1401Google Scholar
- 13.Mahamood RM, Akinlabi ET, Shukla M, Pityana S (2012) Functionally graded material: an overview. World Congress on Engineering 3:1–5Google Scholar
- 18.Tian X, Zhao J, Dong Y, Zhu N, Zhao J, Li A (2014) A comparison between whisker-reinforced alumina and SiAlON ceramic tools in high-speed face milling of Inconel 718. P I Mech Eng B-J Eng 228(8):845–857Google Scholar
- 25.Ai X, Zhao J, Huang CZ, Zhang JH (1998) Development of an advanced ceramic tool material-functionally gradient cutting ceramics. Mat Sci Eng A Struct 248(1–2):125–131Google Scholar