Effect of Intercritical Austenitization and Starting Matrix on Martensite Start Temperature and Austenite Carbon Concentration in Ductile Iron

ABSTRACT: In this work, the effect of the intercritical austenitization temperature and time, Ni ? Cu concentration and starting matrix (fully ferritic or fully pearlitic) on the volume fraction of austenite (fc), martensite start temperature (Ms) and carbon concentration of the parent austenite (C0) in ductile iron was investigated using standard metallographic techniques and high-resolution dilatometry. The results showed that a fully pearlitic starting matrix gives higher fc and C0 and lower Ms than a fully ferritic starting matrix at the same austenitization temperature under continuous heating. On the other hand, the austenitization time has an effect on the parameters under study only during the first minutes of intercritical austenitization. Finally, at the same intercritical austenitization temperature, the addition of Ni + Cu increases the volume fraction of austenite.

• Autores: Machado González, Harold David; Aristizábal Sierra, Ricardo Emilio; Mateo García, Carlos
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2024
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/43248
• Acceso en línea: https://hdl.handle.net/10495/43248
• Palabra clave: Hierro dúctil; Ductile iron; Austenita; Austenite; Resistencia de materiales; Strength of materials; Aleaciones cobre-níquel; Copper-nickel alloys; Intercritical austenitization; Martensite start temperature; Parent austenite; http://id.loc.gov/authorities/subjects/sh85068149
• Rights: openAccess
• License: http://creativecommons.org/licenses/by/2.5/co/