Effect of Coiling Temperatures on Microstructure and Mechanical Properties of IF Steel Sheet in Different Conditions
Titanium-containing IF steel sheets hot rolled then coiled at 690 and 580 ℃ were cold rolled and annealed at 700 ℃.The steel sheets were tested for microstructure,hardness and mechanical properties in hot-rolled and annealed conditions.The results showed that(a)the microstructure was uniform equiaxed ferrite in the steel sheet coiled at 690 ℃,and consisted of obviously deformed ferrite and a small amount of equiaxed ferrite in the steel sheet coiled at 580 ℃;(b)both of the two steel sheets had uniform equiaxed ferrite,and were basically identical in quality of recrystallized grains;(c)the steel sheets coiled at 580 and 690 ℃ both existed a certain intensity of { 111 } γ fiber texture,the { 111 } γ fiber texture was higher in density in the steel sheet coiled at 580℃,and a certain intensity of { 110}<uvw>fiber texture formed in the steel sheet coiled at 690 ℃;(d)after annealing,the two steel sheets were basically identical in microtexture,and both contained { 111 } γ fiber texture exhibiting as intensity as ten level and more;and(e)after annealing,the two steel sheets had no evident difference in hardness,yield strength,tensile strength and average strain hardening index n,and the elongation and plastic strain ratio of the steel sheet coiled at 580 ℃ were slightly larger than those of the steel sheet coiled at 690 ℃.
IF steelcoiling temperatureferritetexturemechanical property
万方数据
维普
