罩式退火温度对高强IF钢组织及性能的影响

为研究不同退火温度下高强IF钢的组织性能及织构的变化规律,采用温箱式电阻炉加热模拟罩式退火工艺,研究了不同退火温度下高强IF钢210P1冷轧板力学性能;对不同退火温度钢板的r90进行了统计并对其进行显微组织观察;采用X射线衍射仪及热场发射扫描电镜对不同退火温度的罩式退火成品板进行了织构分析。结果表明,在高强IF钢210P1冷轧板的罩式退火过程中,提高退火温度将使晶粒明显长大。随着退火温度的升高,屈服强度及抗拉强度下降,伸长率升高,n值略有上升,板材横向r值增加较明显,有利织构{111}取向密度增加,不利织构{100}取向密度降低。

Influence of batch annealing temperatures on microstructure and properties of high strength IF steel

In order to study the microstructure and texture of high strength IF steel under different batch annealing temperatures, the mechanical properties of high strength IF steel 210P1 cold rolled sheet under different annealing temperatures were researched by using oven-type resistance furnace to simulate the batch annealing process. The microstructure of the finished plates was observed and the r90 values of steel plates with different batch annealing temperature were statistically analyzed. The texture analysis of batch annealing finished plates with different batch annealing temperature was carried out by X-ray diffraction and thermal field emission scanning electron microscope. The results showed that increasing the batch annealing temperature caused the increase of grain size. With the increase of annealing temperature, the yield strength and tensile strength decreased, the elongation increased, the n-value increased slightly and the r-value increased obviously, which was beneficial to the enhancement of the {111} texture, and not conducive to the decrease of the {100} texture.