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本文用极图和矩阵相结合的方法验证了在Ｃｒ２５Ｎｉ２０钢里针状σ相与奥氏体基 体具有：｛００１｝σＩＩ｛１１１｝ｒ，＜１１０＞σＩＩ＜１１２＞ｒ晶体学位向关系．在σ相中发现 了可运动位错的存在。定性分析了不同使用条件下σ用对钢机械性能的影响．
In this paper, the combination of polar diagram and matrix is used to verify the relationship between the acicular σ phase and the austenite matrix in Cr25Ni20 steel: {001} σII {111} r, <110> σII <112> r. The presence of a movable dislocation was found in the σ phase. The effect of σ on the mechanical properties of steel under different conditions is qualitatively analyzed.