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

• Main Authors: Oscar Fabián Higuera-Cobos, Jeison Bucurú-Vasco, Andrés Felipe Loaiza-Patiño, Mónica Johanna Monsalve-Arias, Dairo Hernán Mesa-Grajales
• Format: Article
• Language: English
• Published: Universidad Pedagógica y Tecnológica de Colombia 2017-09-01
• Series: Revista Facultad de Ingeniería
• Subjects: Austempered; Retained austenite; Abrasive wear; High chromium white cast iron; Chromium carbides
• Online Access: http://revistas.uptc.edu.co/index.php/ingenieria/article/view/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 ºC with holding time of 6 hours.