Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-23T00:42:08.526Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Niobium on the Microstructure of High Chromium White Cast Iron

Published online by Cambridge University Press:  22 July 2016

Cláudio. G. Oliveira  and
Ivete.P. Pinheiro
Cláudio. G. Oliveira*
Affiliation:
Centro Federal de Educação Tecnológica de Minas Gerais, CEFET-MG. Avenida Amazonas, 5.253 - Nova Suíça, CEP.: 30.480-000, Belo Horizonte, Minas Gerais, Brasil.
Ivete.P. Pinheiro
Affiliation:
Centro Federal de Educação Tecnológica de Minas Gerais, CEFET-MG. Avenida Amazonas, 5.253 - Nova Suíça, CEP.: 30.480-000, Belo Horizonte, Minas Gerais, Brasil.
*
*Cláudio G.Oliveira1 (✉) e-mail: [email protected]
Get access

Abstract

Equipment wear is caused by the disintegration of material due to the contact between the machines components and the ore, resulting in stress to the surface of the material. Wear causes loss of efficiency, vibration, misalignment and, in severe cases, cracks that may lead to fracture and damage to the equipment. In mining, wear is caused by operational problems in which generate high costs. Some researchers studied white cast iron alloys with high chromium and the addition of niobium for wear plates manufacturing and therefore, plates to protect structural parts of the equipment have been developed. This study presents the characterization of the microstructure of two alloys of white cast iron with high chromium containing 3.8 wt.% C and 27.1 wt.% Cr and the addition of 0.9 wt.% Nb (alloy 1) and 1.6 wt.% Nb (alloy 2), respectively. Samples of the two alloys were subjected to metallographic tests, microhardness and abrasion type rubber wheel tests, according to the ASTM: G65-91 standard. Complexes carbides have been identified in both alloys. The results of microhardness and wear resistance tests were correlated and identified the effect of niobium addition. The findings suggest that the addition of niobium in these alloys contributes to the formation of NbC and increase of Cr in the matrix; consequently increase in the hardenability of the material. The wear resistance of alloy 2 was 47.95% higher than alloy 1 in abrasion type rubber wheel tests. It demonstrates that the increase of niobium in the alloy has contributed to improve wear resistance due to the substantial change in the microstructure and distribution of NbC carbides.

Keywords

AlloyCastingCr
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1816: Symposium 5B – Structural and Chemical Characterization of Metals, Alloys and Compounds , 2016 , imrc2015abso45
Copyright
Copyright © Materials Research Society 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Santos, A. B. and Branco, C. H. C., Metalurgia dos Ferros Fundidos Cinzentos e Nodulares. (IPT 100, São Paulo, 1989) p. 232–236.Google Scholar
Siriani, F. A.. Thesis, Engenharia, Escola Politécnica da Universidade de São Paulo, 1973.Google Scholar
Filipovik, M., Kamberovik, Z., Korac, M. and Gavrilovski, M.. Materials and Design 4, 41 (2013).CrossRefGoogle Scholar
Zhi, X., Xing, J., Fu, H. and Xiao, B.. Materials Letters 62, 857 (2008).CrossRefGoogle Scholar
Bedolla, A. J.. Int. J. Cast Metals Res. 13, 343 (2001).CrossRefGoogle Scholar
Kesri, R. and Durand, M. C.. J. Master Sci. 22, 2959 (1987).CrossRefGoogle Scholar
Baik, K.H. and Loper, R.C.. AFS Transactions 96, 405 (1988).Google Scholar
He, C. X., Zhe, C. C., Jin, L.C. and Huai, L.T.. Wear 166, 197 (1993).Google Scholar
Fiset, M., Peev, K. and Radulovik, M.. J. Mater. Sci. Left 12, 615 (1993).CrossRefGoogle Scholar
Berns, H. and Fisher, A.. Metallography 20, 401 (1987).CrossRefGoogle Scholar
Sawamoto, A.. AFS Transactions 94, 403 (1986).Google Scholar
Parent-Simonin, S. and Margerie, J. C., in Tenue de diverses nuances de fontes and frottement abrasif et à I'usure par impact de grenaille. (Colloque International Sur Les Alliages Ferreux A Haute Teneurs En Chrorne Er En Carbone, Saint-Éttienne, 1973) pp. 315–340.Google Scholar
Agapova, L. I., Vetrova, T.S. and Zhukov, A.A.. Metal Science and Heat Treatment 24, 364 (1982).CrossRefGoogle Scholar
Shadrov, N. S., Korshunov, L.G. and Cheremnikh, V. P.. Metal Science and Heat Treatment 25, 284 (1983).CrossRefGoogle Scholar
Albertin, E. et al. , in Ferros Fundidos Brancos Resistentes ao Desgaste Abrasivo, edited by ABIFA (III Congresso Brasileiro de Fundição, São Paulo, 1985) pp. 18–32.Google Scholar
ABNT NBR 15454. Metalografia das Ligas de Ferro-Carbono-Terminologia (2007).Google Scholar
ASTM G65-00. Standard Test Method for Measuring Abrasion Using the Dry Sand/Rubber Wheel Apparatus. (Annual Book of ASTM Standards v.03.02, ASTM, Philadelphia, PA, 2001) pp. 247–259.Google Scholar
Swanson, P.A., in Comparison of Laboratory and Field Abrasion Tests, edited by Ludema, K.C. (Int. ConJ on Wear of Materials, ASME, New York, 1985) pp. 519–525.Google Scholar
Swanson, P.A., in Comparison of Laboratory Abrasion Tests and Field Tests, edited by Ruff, A.W. and Bayer, R.G. (Tribology; Wear Test Selection for Design and Application, ASTM STP 1199, ASTM, Philadelphia, PA, 1993) pp. 80–99.Google Scholar