L485M管线钢的拉伸性能各向异性

Tensile properties anisotropy of L485M pipeline steel

利用Z1200材料拉伸试验机检验了L485M管线钢热轧板卷纵向、30°、45°、横向4个不同方向的屈服强度和抗拉强度,然后利用X’Pert Pro MRD X光衍射仪对板卷厚度不同位置、不同方向的织构进行了检测和分析。结果表明:L485M钢强度指标各向异性明显,横向>纵向>45°>30°,且横向强度明显高于其他3个方向。L485M钢织构检验结果与拉伸性能表现出明显的一致性,纵向、30°、45°主要织构基本为{112}<111>、{001}<110>,理论上横向与纵向晶面一致,晶向相差90°,即横向织构主要为{112}<110>、{001}<112>,因此其性能与其他方向差别明显。

Yield strength and tensile strength of L485 M pipeline steel hot-rolled coil in four different directions(longitudinal,30°,45°,transverse)were tested by a Z1200 material tensile testing machine.Then the texture at different positions and in different directions of the coil thickness was detected and analyzed by an X’Pert Pro MRD X-ray diffractometer.The results show that the anisotropy of strength index of the steel is obvious,and the order of the strength is that transverse>longitudinal>45°>30°,and the transverse strength is obviously higher than that of the other three directions.The texture detection results of the steel show obvious consistency with the tensile properties,the main texture of longitudinal,30°and 45°is{112}<111>,{001}<110>.Theoretically,the transverse and longitudinal crystallographic planes are the same,the difference of crystallographic directions is 90°,that is to say,the transverse texture is mainly{112}<110>,{001}<112>,so its properties are obviously different from that of other directions.