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

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

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...

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Détails bibliographiques
Auteurs principaux: Higuera-Cobos, Oscar Fabián, Bucurú-Vasco, Jeison, Loaiza-Patiño, Andrés Felipe, Monsalve-Arias, Mónica Johanna, Mesa-Grajales, Dairo Hernán
Format: Online
Langue:eng
Publié: Universidad Pedagógica y Tecnológica de Colombia 2017
Sujets:
Austempered
Retained austenite
Abrasive wear
High chromium white cast iron
Chromium carbides
Austemperado
Austenita retenida
Desgaste abrasivo
Fundiciones al alto cromo
Carburos de cromo
Accès en ligne:https://revistas.uptc.edu.co/index.php/ingenieria/article/view/7319
Description
Résumé: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.