INTEMA 05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
EXPERIMENTAL AND NUMERICAL ASSESSMENT OF FRACTURE TOUGHNESS OF DUAL-PHASE AUSTEMPERED DUCTILE IRON
Autor/es:
A. BASSO; R. MARTÍNEZ; A. P. CISILINO; J . SIKORA
Revista:
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES (PRINT)
Editorial:
Blackwell Publishing
Referencias:
Lugar: Chichester, West Sussex PO19 8SQ, UK ; Año: 2010 vol. 33 p. 1 - 11
ISSN:
8756-758X
Resumen:
The effects of the microstructure topology on the fracture toughness of dual-phaseaustempered ductile iron are studied in this paper by means of finite element modellingand experimental testing. To this end, specimens with matrix microstructures rangingfrom fully ferrite to fully ausferrite were studied and the preferential zones and phasesfor crack propagation were identified in every case. The effectiveness of the ausferritephase as a reinforcement of the ferritic matrix via the encapsulation of the brittle andweak last-to-freeze (LTF) zones was confirmed. The toughening mechanism is consequenceof the increment in the crack path longitude as it avoids the encapsulated LTFzones. Besides, the presence of small pools of allotriomorphic ferrite increase the crackpropagation resistance of the ausferrite-ferrite matrices.
