磷、钛对含磷IF高强钢织构的影响

借助电子背散射衍射(EBSD)技术,以罩退生产的冷轧Ti-IF钢及含磷Ti-IF高强钢为目标,分析不同磷、钛合金质量分数对产品特征织构的影响。结果表明,磷元素虽然有利于γ取向线上{111}〈112〉织构的增加,但也增加了组分强度差,不利于塑性应变比r值,并且磷元素对{111}织构发展的促进作用取决于钢中过剰钛的质量分数,过剩钛质量分数过高会促进FeTiP二相粒子的析出,从而阻碍{111}取向再结晶晶粒的长大,弱化{111}面织构的强度。研究结果对该材料合金成分的调整起到了指导作用。为了保证所生产的含磷IF高强钢获得一定的强度,同时兼备良好的冲压性能,应降低IF钢中的钛质量分数,适当加入铌以弥补因钛减少对间隙原子固定产生的影响。

Effect of P and Ti on texture of containing phosphorus high strength IF steel

The effects of the alloying elements of P and Ti on the recrystallization texture characteristics of Ti IF steel and containing P high strength Ti IF steel were researched by EBSD. The results showed that the P element was beneficial to the increase of {111}〈112〉 texture on the γ orientation line，but also increase the strength of the component which is not conducive to the r value，and the promoting effect of P element on the development of {111} texture depends on the mass fraction of excess Ti in steel，the high Ti mass fraction will promote the precipitation of FeTiP particles，which can hinder the growth of {111} oriented recrystallization grains，and weaken the intensity of {111} surface texture. The results can provide a guide to the adjustment of the alloying elements in the material. To ensure that the produced containing P high strength IF steel has certain intensity and good drawing property，the Ti mass fraction in IF steel should be reduced，and the Nb should be added to reduce the effect of the decrease of Ti on the fixation of the interstitial atom.