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首页> 外文期刊>Materials at High Temperatures >Experimental observation of creep damage evolution in seam-welded elbows of mod. 9Cr-1Mo steel
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Experimental observation of creep damage evolution in seam-welded elbows of mod. 9Cr-1Mo steel

机译：mod缝焊弯头蠕变损伤演化的实验观察。 9Cr-1Mo钢

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Seam-welded elbows and straight pipe of the same size as actual high temperature reheat piping for boiler applications were manufactured, and internal pressure creep testing was conducted. Uniaxial creep testing was also performed in order to compare creep damage behaviours. Comparing the observed creep damage evolution and stress analysis results, a creep damage estimation method was discussed. Creep damage distribution varied depending on ovality in the cross sections of the seam-welded elbows. It is important that FEM models for creep analysis incorporate measurement results for the cross-sectional shape of seam-welded elbows. Using the nominal stress of the specimens and the average creep rupture data from small size uniaxial welded joint tests, a simplified prediction method was discussed, which is applicable to creep rupture time prediction for both large creep specimens and seam-welded elbows.
机译：制造与实际用于锅炉的高温再热管道相同尺寸的缝焊弯头和直管，并进行了内部压力蠕变测试。为了比较蠕变损伤的性能，还进行了单轴蠕变测试。比较观察到的蠕变损伤演化和应力分析结果，讨论了蠕变损伤估计方法。蠕变损伤的分布取决于缝焊弯头横截面的椭圆度。蠕变分析的FEM模型必须结合缝焊弯头横截面形状的测量结果，这一点很重要。利用标本的标称应力和小尺寸单轴焊接接头试验的平均蠕变断裂数据，讨论了一种简化的预测方法，该方法适用于大型蠕变试样和缝焊弯头的蠕变断裂时间预测。

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