Abstract

ORTEGA-CUBILLOS, Patricia; NANNETTI-BERNARDINI, Pedro Amedeo; CELSO-FREDEL, Marcio  and  ANTONIO CAMPOS, Rogério. Wear resistance of high chromium white cast iron for coal grinding rolls. Rev.fac.ing.univ. Antioquia [online]. 2015, n.76, pp.134-142. ISSN 0120-6230.  https://doi.org/10.17533/udea.redin.n76a16.

High chromium white cast iron alloy used in coal grinding components is a material that may present different wear resistance depending on the thermal treatment used in its manufacturing. In this context, the properties of this alloy, containing 22% chromium and 3% carbon, were investigated after applying different heat treatments and their influence on the abrasion wear resistance was evaluated. For the characterization of the alloy, several experimental tests were performed using the following laboratory equipment: durometer, microdurometer, optical microscope, scanning electron microscope (SEM), X-ray diffraction, emission spectral photometry and equipment for wear testing according to the ASTM G65-04 (2010) standard. The results obtained reveal that the wear resistance of the selected alloy increases when a lower amount of austenite is retained in the matrix and high precipitation of secondary chromium carbides occurs. They also suggest that it is not necessary to use long times for the alloy destabilization in order to obtain higher hardness values and good wear resistance when the alloy is previously annealed, in contrast to what is practiced in the industry.

Keywords : High chromium white cast irons; destabilization; annealed; wear resistance.

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