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Vol. 26 No. 46 (2017)

Papers

Microstructural evolution during austempering of a ASTM A-532 CLASS III type high chromium white cast iron undergoing abrasive wear

https://doi.org/10.19053/01211129.v26.n46.2017.7319

Published 2017-09-05

Oscar Fabián Higuera-Cobos
Universidad del Atlántico (Barranquilla-Atlántico, Colombia).

Jeison Bucurú-Vasco
Universidad Tecnológica de Pereira (Pereira-Risaralda, Colombia).

Andrés Felipe Loaiza-Patiño
Universidad Tecnológica de Pereira (Pereira-Risaralda, Colombia).

Mónica Johanna Monsalve-Arias
Universidad del Atlántico (Barranquilla-Atlántico, Colombia).

Dairo Hernán Mesa-Grajales
Universidad Tecnológica de Pereira (Pereira-Risaralda, Colombia).

Abstract

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 ºC with holding time of 6 hours.

Keywords

Austempered, Retained austenite, Abrasive wear, High chromium white cast iron, Chromium carbides

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