晶体学织构与晶粒形状对管线钢屈服强度各向异性的影响  

Effects of crystallographic texture and grain shape on the anisotropy of yield strength of pipeline steel

作　　者：宗毳[1] 毛卫民[1] 朱国辉[1,2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243000

出　　处：《金属热处理》2012年第11期1-5,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51071026)

摘　　要：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 of X100 pipeline steel in five different directions deviated from the rolling direction,i.e.,rotated to 0°,30°,45°,60°,and 90°,was observed by tensile test at room temperature.The effects of crystallographic texture and grain shape on the anisotropy of yield strength were discussed based on the data of orientation distribution functions and electron back-scatter diffraction analysis.The anisotropic yield strength was calculated by modeling the average orientation factor and grain shape.The results show that the maximum strength observed at 90° to the rolling direction should be attributed to the crystallographic textures.The grain shape caused the decrease and then increase of yield strength from the 0° to 90° directions,while its minimum was observed at the 45° direction.

关 键 词：管线钢 屈服强度 各向异性 晶体学织构 晶粒形状 

分 类 号：TG142.1[一般工业技术—材料科学与工程]