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| Influence of Cooling Rate on Precipitated Phase of Super Duplex Stainless Steel |
| WANG Xiaofeng1,CHEN Weiqing1,ZHENG Hongguang2 |
| 1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2.Technology Center of Stainless Steel, Baosteel Institute, Shanghai 201900, China |
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Abstract The CCT curve of 00Cr25Ni7Mo4N super duplex stainless steel was obtained by thermal dilatometry, and the influence of cooling rate on precipitated sigma phase was studied by combining with metallographic observation, micro hardness measurement and XRD. The results show that the temperature of heat treatment and hot working should be controlled above 1050 ℃. The less the cooling rate, the more the content of precipitated sigma phase, and the higher the micro hardness. The cooling rate over 4800 ℃/h in the range of 6001000 ℃ should be ensured to avoid the hot brittle sigma phase.
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Received: 01 January 1900
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2009, Vol. 44 
