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Reliability of Processing Map and Influence of Sigma Phase Precipitation on Hot Workability of Duplex Stainless Steel
Jae-Yeol Jeon1, Cheol-Woo Kim1, Hyo-Sang Yoo1
1Suncheon Ppuri Technology Support Center, Korea Institute of Industrial Technology, Suncheon 58022, Jeonnam, Republic of Korea.
Abstract:
The hot deformation characteristics of an UNS No. S32205 grade duplex stainless steel with nitrogen content of 0.17 ms% was studied over the ranges of temperature from 800 to 1200 °C and strain rates from 0.001 to 1.0 s-1 at the total strain of 0.5 by the hot compression test to draw the processing map. The obtained map was discussed in combinations of microstructural observations and TEM analysis. The optimum hot working region is the temperatures from 950 to 1200 °C regardless of the strain rates without cracks and sigma precipitates.
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