Ductile cast irons: Microstructure influence on the fatigue initiation mechanisms. Issue 9 (16th July 2019)

• Record Type: Journal Article
• Authors: Bellini, Costanzo; Di Cocco, Vittorio; Favaro, Gregory; Iacoviello, Francesco; Sorrentino, Luca
• Other Names: Hong Youshi guestEditor.; Susmel Luca guestEditor.; Berto Filippo guestEditor.; Neu Richard W. guestEditor.; Endo Masahiro guestEditor.
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 42:Issue 9(2019)
• Page Start: 2172
• Page End: 2182
• Publication Date: 2019-07-16
• Subjects: damage mechanics -- fatigue -- nodular iron; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.13100
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: In the last decades, the combination of high mechanical performances and low production costs increased the industrial interest on ductile cast irons. These grades are often used for applications where the fatigue resistance can be a critical issue (eg, machine frames for the wind‐power industry or crankshaft used in trucks) and the investigation of the main damaging mechanisms during both the crack initiation and the crack propagation stage could offer new perspectives about these alloys. Ductile cast irons can be considered as a natural composite, being characterized by graphite elements (nodules) embedded in a more or less ductile matrix (ranging from fully ferritic to pearlitic, from martensitic to austempered). In this work, the fatigue crack initiation mechanisms were investigated considering different matrix microstructure and the presence of a mechanical properties gradient in the graphite nodules.