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Microstructure, composition distribution and rupture performance of WC-(Ti,W)C-Ti(C,N)-Co gradient cemented carbonitrides with varied nitrogen

Published online by Cambridge University Press:  01 December 2016

Tian'en Yang  and
Ji Xiong
Tian'en Yang
Affiliation:
School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, People's Republic of China; and School of Engineering, University of Hull, East Yorkshire HU6 7RX, UK
Ji Xiong*
Affiliation:
School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The gradient cemented carbonitrides with brittle cubic phases containing Ti removed in the surface layers were prepared in this paper. The microstructure, composition distribution, fracture morphology, and transverse rupture strength of these materials were investigated systematically. It is found that the difference between the maximum and the nominal cobalt content augments in the gradient layer, the lattice parameter of (Ti,W)C rises in the bulk inside the gradient border, and the (Ti,W)C cubic phases are refined in the inner bulk as the nitrogen is increased. Besides, the area fraction of WC in the gradient layer is higher than in the bulk, but it decreases remarkably close to the gradient border. The improvement of transverse rupture strength stability depends on thickening of gradient layers, and additionally the transgranular fracture of (Ti, W)C cubic phase can be hardly found in the gradient layer.

Keywords

compositediffusionpowder metallurgy
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 23 , 14 December 2016 , pp. 3795 - 3804
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Copyright
Copyright © Materials Research Society 2016 

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