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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 DP440cold rolled strip were studied by the CAS-300simulated continuous annealing equipment.When the heating rate increased from 5to 100℃/s,both the tensile strength and yield strength increased because of the decreased grain size.When the intercritical annealing temperature increased from 780to 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 25to 100℃/s,because the martensite content increased,the tensile strength increased,while the yield strength decreased.When the overaging temperature increased from 260to400℃,the tensile strength decreased,while the yield strength increased.When the overaging time increased from240to 480s,the tensile strength decreased a little,while the yield strength increased a little.
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 DP440cold rolled strip were studied by the CAS-300simulated continuous all the tensile strength and yield strength increased because of the decreased grain size. When the intercritical annealing temperature increased from 780 to 850 ° C, 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 25to 100 ° C./s, as the martensite content increased, the tensile strength increased, while the yield strength decreased. , the tensile strength decreased, while the yield strength increased .When the overaging time inc reased from 240to 480s, the tensile strength decreased a little, while the yield strength increased a little.