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
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
ժҪ 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.
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.
Gang HUO,,Yi-ming CEN,Zhen-xing LI,Guo-dong LI,Chang-sheng LI. Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440 Cold Rolled Strip[J]. �й������ڿ���, 2014, 21(5): 509-516.
Gang HUO,,Yi-ming CEN,Zhen-xing LI,Guo-dong LI,Chang-sheng LI. Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440 Cold Rolled Strip. Chinese Journal of Iron and Steel, 2014, 21(5): 509-516.
2014, Vol. 21 
