采用拉伸试验、金相、ODF织构分析及电子背散射衍射（EBSD）技术研究了一种冷轧高Nb-IF钢和传统Nb＋Ti-IF钢在不同退火温度下的组织性能、织构及晶界特征。结果表明：与传统Nb＋Ti-IF钢相比,该新型高Nb-IF钢由于添加了质量分数为60×10-6的碳和0.10%的铌,其再结晶温度和再结晶完成温度均大幅度提高;新型高Nb-IF钢具有晶粒细小、组织均匀性良好的组织和γ取向织构发展充分且强点密度高的织构,能够获得强度高、伸长率高和r值高的优异的综合性能。EBSD分析结果表明,该新型高Nb-IF钢中小角度晶界和低指数重位点阵（ΣCSL）晶界含量较多,这也是试验钢获得优良成形性能的原因之一。
Microstructure, mechanical properties, texture and grain boundaries characterization of novel high Nb-IF steel sheet and convention Nbq-Ti-IF steel sheet annealed at different temperatures were investigated using tension test, rnetallography, X-ray diffraction ODF analysis and electron backscatter diffraction （EBSD） technique. The results show that the relatively higher carbon content near 60 ）〈 106 with a suitable carbide forming element niobium （0.10%） significantly increases the recrystallization temperature and the fully recrystallization temperature of the novel high Nb-IF steel sheet compared with those of conventional Nb-FTi-IF steel sheet after subjected to the same hot and cold rolling. While this steel has excellent comprehensive properties such as higher strength, higher elon- gation and higher r-value due to the formation of the fine grain structure with more homogeneous microstructure and the ~＇ fiber texture sufficiently develops. EBSD analysis show that more small angle and low coincidence site lattice （,SCSL） boundaries in the high Nb-IF steel sheet is one of the reasons obtain well formability.
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