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Effects of carbides on fatigue characteristics of austempered ductile iron

Stokes, B., Gao, N., Lee, K.K. and Reed, P.A.S. (2005) Effects of carbides on fatigue characteristics of austempered ductile iron Metallurgical and Materials Transactions A, 36, (4), pp. 977-988. (doi:10.1007/s11661-005-0291-0).

Record type: Article

Abstract

Crack initiation and growth behavior of an austempered ductile iron (ADI) austenitized at 800 °C and austempered at 260 °C have been assessed under three-point bend fatigue conditions. Initiation sites have been identified as carbides remaining from the as-cast ductile iron due to insufficient austenization. The number of carbides cracking on loading to stresses greater than 275 MPa is critical in determining the failure mechanism.
In general, high carbide area fractions promote coalescence-dominated fatigue crack failure, while low area fractions promote propagation-dominated fatigue crack failure. Individual carbides have been characterized using finite body tessellation (FBT) and adaptive numerical modeling (SUpport vector Parsimonious ANalysis Of VAriance (SUPANOVA)) techniques in an attempt to quantify the factors promoting carbide fracture. This indicated that large or long and thin carbides on the whole appear to be susceptible to fracture, and carbides that are locally clustered and aligned perpendicular to the tensile axis are particularly susceptible to fracture.

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More information

Published date: 2005
Additional Information: MMTA-0504-977
Keywords: fatigue, austempered ductile iron, crack

Identifiers

Local EPrints ID: 23210
URI: http://eprints.soton.ac.uk/id/eprint/23210
ISSN: 1073-5623
PURE UUID: 2c61588d-8257-4801-a57f-c37aa83598bd
ORCID for P.A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

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Date deposited: 15 Mar 2006
Last modified: 17 Jul 2017 16:18

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Contributors

Author: B. Stokes
Author: N. Gao
Author: K.K. Lee
Author: P.A.S. Reed ORCID iD

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