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Delamination of pipeline steels: determination of an anisotropic cleavage criterion

机译：管线钢分层：各向异性解理标准的确定

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摘要

Cleavage fracture anisotropy has been studied on a ferrite-bainite low alloy pipeline steel plate. Mechanical tests have been performed on smooth and notched bars taken along the three principal directions of the plate at temperatures between 20℃ and -196℃, and analyzed by finite element calculations with an anisotropic plasticity model. The fracture mode of specimens tested along the normal direction differs from that of specimens taken along the two other directions, together with a lower critical cleavage stress. This difference seems to be related to microtexture anisotropy and might explain the sensitivity of this steel to delamination at low temperatures.
机译：研究了铁素体-贝氏体低合金管道钢板的劈裂断裂各向异性。在20℃至-196℃之间的温度下，沿板的三个主要方向对光滑且有缺口的钢筋进行了机械测试，并通过各向异性塑性模型进行了有限元计算分析。沿法线方向测试的样品的断裂模式不同于沿其他两个方向采集的样品的断裂模式，并且临界断裂应力较低。这种差异似乎与微观结构各向异性有关，并可能解释了这种钢在低温下对分层的敏感性。

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