Digital Repository, ICF12, Ottawa 2009

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Superplastic Behavior of AISI 329 Duplex Stainless Steel at High Temperatures under Tensile Loading
F. Taherkhani, J. Aghazadeh Mohandesi, E. Taherkhani

Last modified: 2013-05-07


This study examined the hot tensile behavior of AISI 329 duplex stainless steel to
specify its superplastic conditions. Tensile tests were carried out at temperatures
between 900 and 1200 °C under three strain rates of 0.15 S-1, 0.04 S-1, and 0.001
S-1. The stress-strain curves are associated with yield point phenomenon under
two strain rates of 0.15 S-1 and 0.04 S-1 at temperatures between 950 and 1200°C.
Strain softening is a predominant feature at temperatures above 1000 °C. No
evidence of recrystallization was observed by metallugraphic studies, also multistage
tensile tests showed no strong evidence of recrystallization (i.e., the rate of
strain softening was very low). Microstructural studies showed that the amount of
ferrite phase increases by increasing the test temperature. At low strain rates, the
studied steel reveals superplastic behavior at temperatures above 1000°C
associated with elongations of up to 400 percent.

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