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| Influence of Tempering on Microstructure and Mechanical Property of Dual Phase Steel of CSiMn Alloy System |
| KUANG Shuang1,KANG Yonglin1,YU Hao1,LIU Rendong2,YAN Ling2 |
| 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Ｔechnical Center,Anshan Iron and Steel Corporation, Anshan 114001, Liaoning, China |
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Abstract The influence of tempering temperature on the microstructure and mechanical properties of a dual phase steel was studied. The results of mechanical test show that elongation is improved by tempering below 250 ℃, but the change of other mechanical properties is not obvious. After tempering above 300 ℃, elongation does not increase much, but the yield strength is increased with decrease of tensile strength, workhardening and bakehardening capacity deteriorating the mechanical properties of the steel. The results of SEM and TEM analysis indicate that the variation of microstructure is not changed obviously after tempering below 250 ℃,the morphology of martensite is lathshaped and a large number of unobstructed dislocations is observed in ferrite and around martensite islands. By tempering above 300 ℃, martensite decomposes obviously, making the boundaries illegible, and precipitation of carbide particles in the islands. In ferrite the density of dislocation decreases, and there are many coarse precipitates on dislocation lines. The decomposition of martensite and decrease of dislocation density in ferrite are the main reasons of deteriorating the mechanical properties of dual phase steel.
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Received: 01 January 1900
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2008, Vol. 43 
