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.
Similar content being viewed by others
References
X. Zhou, K. Wang, Z. Xu, T. Liu, G. Li, Q. Wang, and J. He: Effect of powder particle size on gradient formation and grain growth in ultrafine crystalline gradient cemented carbide. Int. J. Refract. Met. Hard Mater. 56, 63 (2015).
X. Zhou, Z. Xu, K. Wang, G. Li, T. Liu, Q. Wang, and J. He: One-step Sinter-HIP method for preparation of functionally graded cemented carbide with ultrafine grains. Ceram. Int. 42, 5362 (2015).
W. Zhang, Y. Du, and Y. Peng: Effect of TaC and NbC addition on the microstructure and hardness in graded cemented carbides: Simulations and experiments. Ceram. Int. 42, 428 (2016).
R. Frykholm, B. Jansson, and H.O. Andrén: The influence of carbon content on formation of carbo-nitride free surface layers in cemented carbides. Int. J. Refract. Met. Hard Mater. 20, 345 (2002).
M. Mohammadpour, P. Abachi, and K. Pourazarang: Effect of cobalt replacement by nickel on functionally graded cemented carbonitrides. Int. J. Refract. Met. Hard Mater. 30, 42 (2012).
J. Garcia: Investigations on kinetics of formation of fcc-free surface layers on cemented carbides with Fe–Ni–Co binders. Int. J. Refract. Met. Hard Mater. 29, 306 (2011).
J. Xiong, Z. Guo, M. Yang, S. Xiong, J. Chen, Y. Wu, B. Wen, and D. Cao: Effect of ultra-fine TiC0.5N0.5 on the microstructure and properties of gradient cemented carbide. J. Mater. Process. Technol. 209, 5293 (2009).
W. Zhang, Y. Du, Y. Peng, W. Xie, G. Wen, and S. Wang: Experimental investigation and simulation of the effect of Ti and N contents on the formation of fcc-free surface layers in WC-Ti(C,N)-Co cemented carbides. Int. J. Refract. Met. Hard Mater. 41, 638 (2013).
T. Yang, J. Xiong, L. Sun, Z. Guo, and D. Ding: Effect of nitrogen introduction methods on the microstructure and properties of gradient cemented carbides. Int. J. Miner., Metall. Mater. 18, 709 (2011).
R. Frykholm, M. Ekroth, and B. Jansson: Effect of cubic phase composition on gradient zone formation in cemented carbides. Int. J. Refract. Met. Hard Mater. 19, 527 (2001).
W. Zhang, Y. Du, W. Chen, Y. Peng, P. Zhou, S. Wang, G. Wen, and W. Xie: CSUDDCC1-A diffusion database for multicomponent cemented carbides. Int. J. Miner., Metall. Mater. 43, 164 (2014).
M. Ekroth, R. Frykholm, M. Lindholm, H.O. Andrén, and J. Ågren: Gradient zones in WC-Ti(C,N)-Co-based cemented carbides: Experimental study and computer simulations. Acta Mater. 48, 2177 (2000).
M. Schwarzkopf, H. Exner, and H.F. Fischmeister: Kinetics of compositional modification of (W, Ti)C-WC-Co alloy surfaces. Mater. Sci. Eng., A 105–106, 225 (1988).
P. Streitenberger and D. Zöllner: The envelope of size distributions in Ostwald ripening and grain growth. Acta Mater. 88, 334 (2015).
J. Li, C. Guo, Y. Ma, Z. Wang, and J. Wang: Effect of initial particle size distribution on the dynamics of transient Ostwald ripening: A phase field study. Acta Mater. 90, 10 (2015).
C.W. Morton, D.J. Wills, and K. Stjernberg: The temperature ranges for maximum effectiveness of grain growth inhibitors in WC–Co alloys. Int. J. Refract. Met. Hard Mater. 23, 287 (2005).
R. Frykholm and H.O. Andrén: Development of the microstructure during gradient sintering of a cemented carbide. Mater. Chem. Phys. 67, 203 (2001).
Q. Yang, W. Xiong, M. Zhang, B. Huang, and S. Chen: Microstructure and mechanical properties of Mo-free Ti(C,N)-based cermets with Ni−x Cr binders. J. Alloys Compd. 636, 270 (2015).
Q. Xu, X. Ai, J. Zhao, H. Zhang, W. Qin, and F. Gong: Effect of heating rate on the mechanical properties and microstructure of Ti(C,N)-based cermets. Mater. Sci. Eng., A 628, 281 (2015).
W. Zhou, Y. Zheng, Y. Zhao, Y. Ma, and W. Xiong: Microstructure characterization and mechanical properties of Ti(C,N)-based cermets with AlN addition. Ceram. Int. 41, 5010 (2015).
Q. Xu, J. Zhao, X. Ai, W. Qin, D. Wang, and W. Huang: Effect of Mo2C/(Mo2C + WC) weight ratio on the microstructure and mechanical properties of Ti(C,N)-based cermet tool materials. J. Alloys Compd. 649, 885 (2015).
P. Lindahl, P. Gustafson, U. Rolander, L. Stals, and H. Andrén: Microstructure of model cermets with high Mo or W content. Int. J. Refract. Met. Hard Mater. 17, 411 (1999).
Y. Liu, H. Wang, Z. Long, J. Yang, and W. Zhang: Enhancement on the transverse fracture strength of functional graded structure cemented carbides. J. Mater. Sci. 40, 5525 (2005).
A. Khalili and K. Kromp: Statistical properties of Weibull estimators. J. Mater. Sci. 26, 6741 (1991).
C.A. Klein: Characteristic strength, Weibull modulus, and failure probability of fused silica glass. Opt. Eng. 48, 933 (2009).
H. Xie, Y. Liu, J. Ye, M. Li, Y. Zhu, and H. Fan: Effect of (Cr0.8V0.2)2(C,N) addition on microstructure and mechanical properties of WC-8Co cemented carbides. Int. J. Refract. Met. Hard Mater. 47, 145 (2014).
Y. Sun, W. Su, H. Yang, and J. Ruan: Effects of WC particle size on sintering behavior and mechanical properties of coarse grained WC-8Co cemented carbides fabricated by unmilled composite powders. Ceram. Int. 41, 14482 (2015).
A. Shatov, S. Ponomarev, and S. Firstov: Fracture of WC-Ni cemented carbides with different shape of WC crystals. Int. J. Refract. Met. Hard Mater. 26, 68 (2008).
ACKNOWLEDGMENTS
Support for this work by the Basic Research Programs of Sichuan Province (No. 2014GZ0086) and the China Scholarship Council (CSC) to support Tian’en Yang as a visiting PhD researcher in the School of Engineering, University of Hull are gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yang, T., Xiong, J. Microstructure, composition distribution and rupture performance of WC-(Ti,W)C-Ti(C,N)-Co gradient cemented carbonitrides with varied nitrogen. Journal of Materials Research 31, 3795–3804 (2016). https://doi.org/10.1557/jmr.2016.434
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/jmr.2016.434