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Effect of Aging on the Microstructure and Mechanical Properties in Super Duplex Stainless Steel  

Kim, Su-Chun (Department of Physical Matellurgy, Graduate School, PuKyung National University)
Kang, Chang-Yong (Div. of Advanced Materials Science & Engineering, PuKyung National University)
Publication Information
Journal of Ocean Engineering and Technology / v.23, no.3, 2009 , pp. 40-45 More about this Journal
Abstract
With the increase in the annealing temperature, the volume fraction of austenite phase increased and the volume fraction of ferrite phase decreased. In compliance with the addition of N, not only the volume fraction of austenite phase was increased but also the austenite structure was made larger. Volume fraction of ${\sigma}$ phase was increased by decreasing of the volume fraction of ferrite phase, with the increase in the aging time and in compliance with the addition of N. As increasing in volume fraction of ${\sigma}$ phase, tensile strength and hardness increased, while elongation and impact value decreased. Elongation slowly decreased and impact value rapidly decreased at the early stage of aging. By the added N, tensile strength, elongation, hardness and impact value was increased.
Keywords
Duplex stainless steel; Aging; ${\sigma}$ phase; Austenite phase; Ferrite phase;
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  • Reference
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