Damage and rupture mechanisms in an austenoferritic duplex steel

Bénédicte Verhaeghe, François Louchet, Yves Bréchet, Jean Paul Massoud

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The influence of ageing on damage and rupture mechanisms in an austenoferritic duplex stainless steel is studied using conventional straining and impact toughness testing at 20°C and 320 C, and in situ SEM straining at 20°C. While the as-received alloy fails in a ductile mode, damage in the aged material starts with cleavage nucleation in ferrite. We show that, owing to the bipercolated topology of the alloy, these cleavage cracks can propagate while passing round austenite ligaments whose plastic stretching controls the crack extension. The variations with strain of both the crack size and the average crack separation are computed analytically and their comparison gives a good prediction of ductility.

Original languageEnglish
Pages (from-to)1811-1819
Number of pages9
JournalActa Materialia
Issue number5
Publication statusPublished - May 1997
Externally publishedYes

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