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| Effect of Hot Deformation Parameters on Phase Transformation in Austenite NonRecrystallization Region of Niobium Steel |
| YIN Shubiao1,2,LIU Qingyou2,ZHANG Zhibo2,SUN Xinjun2,LEI Ting1 |
| 1. School of Material and Metallurgy Engineering, Kunming University of Science and Technology, Kunming 630091, Yunnan, China;2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract By using of ThermecomastorZ machine, the transformation of 0.128%Nb microalloyed low carbon steel in austenite nonrecrystallization region during continuous cooling was studied.The effect of the deformation parameters(deformation temperature, strain rate, strain) on the transformation was analyzed. The results indicate that transformation start temperature drops with the raising of cooling rate. when the cooling rate higher than 5 ℃/s, more than 90% of the structure is granular bainite. Increasing deformation temperature, enhancing strain and increasing strain rate can accelerate transformation.
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Received: 01 January 1900
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2008, Vol. 43 
