标题：High-speed intermittent turning of GH2132 alloy with Si3N4/(W, Ti)C/Co graded ceramic tool
作者：Tian, Xianhua; Zhao, Jun; Yang, Haifeng; Wang, Zhongbin; Liu, Hao
作者机构：[Tian, Xianhua; Yang, Haifeng; Wang, Zhongbin; Liu, Hao] China Univ Min & Technol, Sch Mech Engn, Xuzhou 221116, Jiangsu, Peoples R China.; [Tian, X 更多
通讯作者：Tian, Xianhua;Tian, XH;Tian, XH
通讯作者地址：[Tian, XH]China Univ Min & Technol, Sch Mech Engn, Xuzhou 221116, Jiangsu, Peoples R China;[Tian, XH]China Univ Min & Technol, Jiangsu Key Lab Mine Me 更多
来源：INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
关键词：Ceramic tools; Intermittent cutting; Failure mechanisms; Superalloys
摘要：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.