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通过室温拉伸试验观察了X100管线钢板与轧向夹角分别为0°、30°、45°、60°与90°方向上的屈服强度。利用X射线衍射技术测算的取向分布函数数据及背散射电子技术分析出的晶粒形状参数分别讨论了织构与晶粒几何形状对管线钢屈服强度各向异性的影响规律,建立了综合晶体学取向与晶粒几何形状共同作用的屈服强度理论模型,并比较理论计算值与实测值。结果显示,晶体学织构是造成管线钢横向屈服强度大于其它方向的主要原因,而晶粒形状则造成了管线钢从轧向到横向的屈服强度先减小后增大且在45°方向上最低。
The yield strength in the direction of 0 °, 30 °, 45 °, 60 ° and 90 ° of X100 pipeline steel and rolling direction was observed by room temperature tensile test. The influences of texture and grain geometry on the yield strength anisotropy of pipeline steel were discussed respectively by using the XRD data and the shape parameters of the grain analyzed by backscattering electron technique. The comprehensive crystallography Orientation and the grain geometry of the yield strength theoretical model, and compare theoretical calculations and measured values. The results show that the crystallographic texture is the main reason that the yield strength of the pipeline steel is greater than the other directions, while the grain shape causes the yield strength of the pipeline steel to decrease from the rolling direction to the transverse direction and then increases and increases in the 45 ° direction lowest.