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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Creep failure behaviour of a circumferential P91 pipe weldment with an anisotropic weld metal subjected to internal pressure and end load
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Creep failure behaviour of a circumferential P91 pipe weldment with an anisotropic weld metal subjected to internal pressure and end load

机译：承受内部压力和最终载荷的各向异性焊接金属的P91圆周管件的蠕变破坏行为

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摘要

The creep failure behaviour of a P91 pipe weldment that has an 'anisotropic' weld metal (WM), under internal pressure and end load, was investigated using the finite-element (FE) method. It is assumed that the WM consists of a columnar region and a weaker equiaxed (fine-grained and coarse-grained) region. A practical pipe weld and bead dimensions were used for the FE model. Creep damage analyses were conducted using a single-variable, Kachanov type damage law, for which the material properties used were determined on the basis of the experimental data. Life prediction was also performed using a steady-state approach. Three representative cases, i.e. 'matched', 'under-matched', and 'over-matched', with respect to WM strength, were considered. Failure lives and failure positions of the weldment, for various cases, were investigated. The results were compared with those obtained from the corresponding weldment with an isotropic WM, from which the effects of the WM anisotropy on the failure life and failure location can be evaluated.
机译：使用有限元（FE）方法研究了具有“各向异性”焊接金属（WM）的P91管件在内部压力和最终载荷下的蠕变破坏行为。假定WM由柱状区域和较弱的等轴（细粒度和粗粒度）区域组成。有限元模型使用了实际的管道焊缝和焊道尺寸。使用单变量Kachanov型损伤定律进行蠕变损伤分析，为此，根据实验数据确定所使用的材料性能。还使用稳态方法进行了寿命预测。就WM强度而言，考虑了三个具有代表性的案例，即“匹配”，“未匹配”和“过度匹配”。对于各种情况，研究了焊件的失效寿命和失效位置。将结果与从各向同性WM焊件获得的结果进行比较，从中可以评估WM各向异性对失效寿命和失效位置的影响。

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