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通过对轧制态的含磷Nb-Ti高强IF钢冷轧硬卷进行750～870℃退火试验,在Instron5569拉伸试验机上测试计算了塑性应变比r值和平面各向异性指数Δr,并对不同退火温度下的试样进行了ODF分析。结果表明,退火温度从750℃升高到870℃,试验钢的r0、r45、r90和珋r均随温度的升高而增大;平面各向异性随退火温度的升高而降低。结合显微组织分析,810～840℃退火时,试验钢获得最佳综合性能。试验钢从冷轧态到完全再结晶,{001}<110>、{110}<110>织构强度降低,{112}<110>织构遗传成为最强织构,而{111}<110>织构比{111}<112>织构强,使Δr值为负值;最佳退火温度(810～840℃)条件下最大珋r值为1.65,Δr为-0.38。
The cold rolling of cold-rolled phosphorus-containing Nb-Ti high-strength IF steel was carried out at 750 ~ 870 ℃ by means of an annealing test. The plastic strain ratio r and the plane anisotropy index Δr were tested and calculated on an Instron5569 tensile testing machine. The samples under different annealing temperature were analyzed by ODF. The results show that the r0, r45, r90 and rr of the test steel increase with increasing temperature when the annealing temperature increases from 750 ℃ to 870 ℃. The plane anisotropy decreases with the increase of annealing temperature. Combined with microstructure analysis, the best overall performance of the test steel was obtained when annealed at 810 ~ 840 ℃. The texture strength of {001} <110> and {110} <110> decreased and the texture of {112} <110> became the strongest texture from the cold rolling to the complete recrystallization. The {111} > Texture is stronger than that of {111} <112> and the value of Δr is negative. The maximum value of r is 1.65 and Δr is -0.38 under the optimal annealing temperature (810 ~ 840 ℃).