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Microstructures in Historical and Archaeological Steel Objects Resulting From Aging Process / Durch Alterungsprozesse entstandene Gefüge in historischen und archäologischen Gegenständen aus Stahl

Antonio José Criado · Juan Antonio Martı́nez · Rafael Calabrés · Luisa Maria Rodriguez · José Manuel Jiménez

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Metallurgy and Cultural Artifacts Microstructure and Mechanical Properties of Steels Material Properties and Failure Mechanisms

Abstract

The passing of larger periods of time produces appreciable aging effects in iron and steels. This study, which has been conducted on historical and archaeological iron and steel objects originating from the Iron Age up to the Medieval period, has provided information concerning characteristic microstructures with which the aging phenomenon can be explained. All examined objects show signs of important changes in the original microstructures. From observing the structures it has been deduced that conventional heat-treatments do not give completely stable structures. The passing of greater periods of time seem to promote slow diffusion processes, which results in more stable, crystalline forms [1].

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