Effects of cooling rate and annealing treatment on sensitization of austenitic-ferritic duplex stainless steel |
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| Authors: | Hak Lui Lee Patrick J Moran |
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| Affiliation: | (1) Mechanical Engineering Department, R.O.K. Naval Academy, 88-2-3 Aengkok-dong, 645-797 Chinhae, Korea;(2) Mechanical Engineering Department, U.S. Naval Academy, 21401 Annapolis, MD, USA |
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| Abstract: | Duplex stainless steel has higher corrosion resistance and better mechanical properties than conventional type 300 series
stainless steel. The corrosion behavior of duplex stainless steel is strongly dependent on the ratio, shape, size and distribution
of austenite and ferrite phase in the microstructure. The relationship between the microstructure and the corrosion behavior
of the duplex stainless steel was studied. For this purpose, the duplex stainless steel samples were solution heal treated
at 1150°C followed by either cooling at various rates (water quenching, air coooling, furnace colling with door opened and
door closed) to 820°C and then water quenching to room temperature, or quenching to room temperature and annealing heat treatment
at 840°C for various lengths of time. A double loop electrochemical polentiodynamic reactivation (EPR) test was carried out
to examine the effect of various cooling procedures or annealing treatment on the sensitization of duplex stainless steel.
The grain size, shape, and distribution of the two phases were examined under microscope. From the test results, the relationships
were discussed among heat treatment, electrochemical properties and microstructure. |
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| Keywords: | duplex stainless steel corrosion resistance annelaing treatment electrochemical potentiodynamic reactivation test austenite phase ferrite phase |
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