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| Effect of Overaging Temperature in Continuous Annealing on Microstructure and Properties of HeatTreated DP Steel |
| HAN Huiquan,HUO Gang,LIU Yanchun,WANG Guodong |
| State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, Liaoning, China |
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Abstract With bright continuous annealing simulator, the microstructure and properties of 0.08C1.7Mn0.03Si steel treated with different overaging temperature and the phase transformation during continuous annealing process were studied. The results show that second phase was mostly of granular bainite and martensite in the specimen overaged at 450 ℃, mostly lath bainite and martensite in the specimen overaged at 350 ℃ and mostly martensite or MA island in the specimen overaged at 250 ℃; Tensile strength was increased and yield strength decreased, obviously, but n, and Erichsen value changed only a little with reduction of overaging temperature, thus, adjusting constituent ratio of second phase perhaps is an effective way for promoting plasticity of the steel due to the fact that elongation of the steel overaged at 350 ℃ was increased.
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Received: 01 January 1900
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2009, Vol. 44 
