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The Effect of Aging Treatment on the Microstructure and Mechanical Properties of Super Duplex Stainless Steel with W  

Kim, Soo-Chun (Advanced Metallugy, Pukyong National University)
Bae, Dong-Soo (Advanced Metallugy, Dong-ui University)
Kang, Chang-Yong (Advanced Metallugy, Pukyong National University)
Publication Information
Journal of Ocean Engineering and Technology / v.23, no.4, 2009 , pp. 52-57 More about this Journal
Abstract
The effect of aging treatment on the microstructure and mechanical properties of super duplex stainless steel with W was investigated. The phase was precipitated mainly at the early stage of aging and a lower aging temperature under $750^{\circ}C$, but the phase was formed after long-term aging treatment between $600^{\circ}C$ and $900^{\circ}C$. The volume fraction of the phase increased with aging temperature up to $750^{\circ}C$ and then decreased up to $900^{\circ}C$. With an increase in the aging time, the volume fraction phase at the early stage of aging increased slightly, and then increased rapidly beyond a certain time. The rapid increase in the tensile strength and hardness and decrease in the elongation and impact toughness were measured with aging temperatures up to $750^{\circ}C$. On the other hand, the tensile strength and hardness decreased slightly, and the elongation and Charpy impact toughness were unchanged with aging temperatures over $750^{\circ}C$. The tensile strength and hardness increased rapidly at the early stage of aging, and then increased slowly beyond a certain time. The elongation and Charpy impact toughness decreased rapidly at the early stage of aging, and then remained unchanged beyond a certain time. The phase that formed at the early stage of aging and the lower aging temperature had a considerable effect on the elongation and Charpy impact toughness of the super duplex stainless steel with W.
Keywords
Super duplex stainless steel; Aging treatment; Sigma phase; Kai phase;
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Times Cited By KSCI : 1  (Citation Analysis)
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