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| Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440 Cold Rolled Strip |
| Gang HUO1,2,Yi-ming CEN1,Zhen-xing LI1,Guo-dong LI2,Chang-sheng LI1 |
1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning,China
2. Pohang Cold Strip Rolling Co. , Ltd. , Bensteel, Benxi 117000, Liaoning, China |
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Abstract In order to optimize the production process, improve the production efficiency and accelerate the development and application of the domestic dual-phase steel, the effects of heat treatment process parameters on microstructure and mechanical properties of DP440 cold rolled strip were studied by the CAS-300 simulated continuous annealing equipment. When the heating rate increased from 5 to 100 ��/s, both the tensile strength and yield strength increased because of the decreased grain size. When the intercritical annealing temperature increased from 780 to 850 ��, the martensite content decreased so that the tensile strength decreased first, then increased, and the yield strength increased. When the rapid cooling rate increased from 25 to 100 ��/s, because the martensite content increased, the tensile strength increased, while the yield strength decreased. When the overaging temperature increased from 260 to 400 ��, the tensile strength decreased, while the yield strength increased. When the overaging time increased from 240 to 480 s, the tensile strength decreased a little, while the yield strength increased a little.
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Received: 01 November 2012
Published: 14 May 2014
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| Fund:Projects Sponsored by the National Natural Science Foundation of China;Projects Sponsored by the National Natural Science Foundation of China |
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Corresponding Authors:
Chang-sheng LI
E-mail: lics@ral.neu.edu.cn
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2014, Vol. 21 
