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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: claudio@technium.com.br
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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 

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