Microstructures and Properties of Recycled Composites – Particle Reinforced Iron Matrix Functionally Graded Materials Fabricated by Centrifugal Casting ()
Abstract
Microstructures and properties of recycled composites ring parts containing cast tungsten carbide particles (CTCp) in a bainitic matrix fabricated from dead or waste composites roll rings by centrifugal casting after remelting treatment, have been tested using SEM, EDS and XRD analyses as well as mechanical property testers. The test results show that the CTCp surface were partially dissolved into the liquid iron at 1650 ºC during remelting. The undissolved CTCp in the Fe melt moved towards the outer region under the action of the centrifugal force during casting, which caused the formation of outer reinforced region and inner unreinforced region along the radial direction of the parts. SEM observation displays that the undissolved CTCp distribution in the outer region is even, and the volume fraction of them is increased with increasing rotational speed of the mold. Besides, mechanical tests of the parts show that the outer region exhibits superior hardness, and the inner region has sufficient impact toughness; the volume fraction of CTCP influences the mechanical properties. The dissolution-reprecipition of CTCP during centrifugal casting was also discussed.
Share and Cite:
Y. Song, S. Bi and X. Li, "Microstructures and Properties of Recycled Composites – Particle Reinforced Iron Matrix Functionally Graded Materials Fabricated by Centrifugal Casting,"
Engineering, Vol. 2 No. 5, 2010, pp. 360-366. doi:
10.4236/eng.2010.25047.
Conflicts of Interest
The authors declare no conflicts of interest.
References
|
[1]
|
M. Pellizzari, D. Cescato and M. G. De Flora, “Hot Friction and Wear Behaviour of High Speed Steel and High Chromium Iron for Rolls,” Wear, Vol. 267, 2009, pp. 467-475.
|
|
[2]
|
R. K. Viswanadham and P. G. Lindquist, “Transformation- Toughening in Cemented Carbides: Part I. Binder Composition Control,” Metallurgical and Materials Transactions A, Vol. 18A, 1987, pp. 2163-2173.
|
|
[3]
|
B. Uhrenius, “Phase Diagrams as a Tool for Production and Development of Cemented Carbides and Steels,” Powder Metallurgy, Vol. 35, No. 3, 1992, pp. 203-210.
|
|
[4]
|
R. Cooper, S. A. Manktelow, F. Wong and L. E. Collins, “The Sintering Characteristics and Properties of Hard Metal with Ni-Cr Binders,” Materials Science and Engineering A, Vol. A105-A106, 1988, pp. 269-273.
|
|
[5]
|
Y. P. Song, H. Yu, J. G. He, “Elevated Temperature Sliding Wear Behavior of WCP-Reinforced Ferrous Matrix Composites,” Journal of Matierals Science, Vol. 43, 2008, pp.7115-7120.
|
|
[6]
|
Y. P. Song, H. Yu and X. M. Mao, “Wear Behavior of WCP/Fe-C Composites under High-Speed Dry Sliding,” Journal of Materials Science, Vol. 43, No.8, 2008, pp. 2686-2692.
|
|
[7]
|
“High-Speed Steel Sintered Hardmetals,” Zhuzhou Hardmetal Works, Metallurgical Industry Press, 1982, pp. 86-92.
|