Cutting Performance of WC-Co Alloys Modified by Nano-Additives

J Mater Sci Technol ›› 2012, Vol. 28 ›› Issue (3): 205-213.

• Nanomaterials and Nanotechnology • Previous Articles Next Articles

Cutting Performance of WC-Co Alloys Modified by Nano-Additives

You Wang¹⁾ , Zhaoyi Pan¹⁾, Chengbiao Wang²⁾, Xiaoguang Sun¹⁾, Zhijian Peng²⁾, Baolin Wang²⁾

1) Laboratory of Nano Surface Engineering, Department of Materials Science, Harbin Institute of Technology, Harbin 150001, China
2) School of Engineering and Technology, China University of Geosciences, Beijing 100083, China

Received:2010-12-10 Revised:2011-05-04 Online:2012-03-31 Published:2012-03-31
Contact: You Wang
Supported by:
the Program of Excellent Team at Harbin Institute of Technology

Abstract

Abstract: In this paper, the microstructure of WC-Co alloys with and without nano-additives was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The hardness and fracture toughness was tested by using a Vickers hardness tester and a universal testing machine. The cutting test was carried out at di®erent feed velocities (250 r/min and 320 r/min), and the contact pairs are cutting tools and 45# steel bars. Results showed that the hardness and fracture toughness of WC-Co cemented carbides with nano-additives are higher than that of WC-Co cemented carbides without nano-additives, and they are increased 10.21% and 19.69%, respectively. The flank worn width and crater width of cutting tools decrease
greatly with the addition of nano-additives. For the nano-modified specimen with WC grain size of 7μm, both the flank worn width and crater width are the minimum after the cutting process. And there are little built-up layers and some pile-up regions on the flank face leading to high cutting performance for the nano-modified cemented carbides. There are some melted regions on the flank face of cutting tools without nano-additives, and the WC grains on the cross section of alloys without nano-additives show severe fragmentation. The wear type of WC-Co is flank wear, and the wear mechanism is abrasive, adhesion and oxidation wear.

Key words: Cutting tools, Hardness, Fracture, Surface analysis

You Wang, Zhaoyi Pan, Chengbiao Wang, Xiaoguang Sun, Zhijian Peng, Baolin Wang. Cutting Performance of WC-Co Alloys Modified by Nano-Additives[J]. J Mater Sci Technol, 2012, 28(3): 205-213.

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Cutting Performance of WC-Co Alloys Modified by Nano-Additives

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