Multilayered and nanolayered hard nitride thin films deposited by cathodic arc evaporation. Part 2: Mechanical properties and cutting performances

被引:46
作者
Ducros, C. [1 ]
Sanchette, F. [1 ]
机构
[1] CEA Grenoble, Lab Technol Surfaces, DTEN, STN,LTS, F-38054 Grenoble, France
关键词
arc evaporation; superlattice; mechanical properties; cutting tools; superalloy machining;
D O I
10.1016/j.surfcoat.2006.01.029
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The objective of this study is to investigate the performance of newly developed grades of nanolayer coated carbide tools for single point turning operation of difficult-to-cut alloys as Inconel 718. Nickel base alloys are difficult-to-machine materials because of their very good mechanical resistance at high temperature. Cemented carbide cutting tools, widely used for turning these alloys, are coated in order to promote their cutting lifetime. In this study, three compositions of multilayer coatings are deposited on cutting tools: CrN-TiN, TiN-AlTiN and CrN-AlTiN. These coatings, deposited in an industrial-size cathodic arc evaporation device, have approximately the same total thickness. Mechanical properties were first correlated to the period of these coatings. In a second time, the influence of this period, thickness of two successive nanolayers, was studied concerning turning performances. Mechanical and tribological properties are strongly dependant on coating structure (description in Part 1 [C. Ducros, C. Cayron, F. Sanchette, To be published in Surface and Coatings Technology]). The best mechanical properties were obtained with TiN/AlTiN nanolayers with 7 nm periods and superlattice structure. These coatings induced low main cutting force and low flank wear during Inconel 718 turning. Time life of superlattice TiN-AlTiN coated cutting tool is increased comparatively to CVD coated and AlTiN coated cutting tools currently used in production. (c) 2006 Published by Elsevier B.V.
引用
收藏
页码:1045 / 1052
页数:8
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