利用电子背散射衍射(EBSD)技术对X70,X80和X100 3种管线钢进行了取向成像分析.结果表明,尽管3种管线钢的强度级别不同,微观结构存在较大的差异,但都具有相似的取向差择尤分布,其取向差主要分布在2°～15°和47°～60°区间,呈“双峰”分布特征.进一步的分析表明,奥氏体主要以K-S关系向中温铁素体转变,Dahmen的二维不变线模型验证了这一结果.K-S关系变体间特定的取向差关系是造成这3种管线钢取向差择尤分布的原因.
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