Resumo

HIGUERA-COBOS, Oscar Fabián et al. Microstructural evolution during austempering of o ASTM A-532 CLASS III type high chromium white cast iron undergoing abrasive wear. Rev. Fac. ing. [online]. 2017, vol.26, n.46, pp.71-79. ISSN 0121-1129.  https://doi.org/10.19053/01211129.v26.n46.2017.7319.

This paper studies the influence of variables such as holding temperatures and times during austempering of High Chromium White Cast Iron (HCWCI), with the following chemical composition: Cr 25 %, C 3 %, Si 0.47 %, Mn 0.74 % and Mo 1.02 %. The aim of the austempering was to modify the percentage of retained austenite and its correlation to abrasive wear resistance under different conditions. Microhardness tests, SEM-EDS and XRD were performed to determine mechanical properties, chemical composition, and type of carbides and microstructures present, respectively. The tests complied with the ASTM G-65 standard. Results showed that the best performance against abrasion was achieved for austempering at 450 °C with holding time of 6 hours.

Palavras-chave : Austempered; Retained austenite; Abrasive wear; High chromium white cast iron; Chromium carbides.

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