MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Improvement of Fatigue Properties by Means of Continuous Cyclic Bending and Annealing in an Al-Mg-Mn Alloy Sheet
Yoshimasa TakayamaJun SasakiHajime KatoHideo Watanabe
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2004 Volume 45 Issue 6 Pages 1833-1838

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Abstract

The fatigue properties in the Al-Mg-Mn alloy sheet subjected by the continuous cyclic bending (CCB) and annealing have been investigated. By the CCB and subsequent annealing, the gradient microstructure with coarse-grained surface layers and fine-grained central layer is produced in the sheet. The fatigue life of the CCBent and annealed sheet is 2—4 times longer than that of the as-received one. The existence of the coarse-grained surface layers makes the crack propagation rate lower by a factor of 1/2 to 1/3. The fatigue crack growth in the sheet consisting of such different microstructure layers is characterized by the fractography. Further, factors improving the fatigue properties are discussed.

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© 2004 The Japan Institute of Metals and Materials
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