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Residual stress distributions in a P91 steel-pipe girth weld before and after post weld heat treatment

机译:P91钢管环焊缝焊后热处理前后的残余应力分布

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In this study the residual stresses in a pipe girth weld in a ferritic-martensitic power plant steel were measured by neutron diffraction and compared with the corresponding metallurgical zones in the weld region. It was found that, in both the as-welded and post-weld heat treated condition, the highest tensile stresses resided near the outer boundary of the heat-affected zone (HAZ), and towards the weld root region. Substantial tensile direct and hydrostatic stresses existed across the HAZ, including the finegrained and intercritically annealed regions, where premature type IV creep failures manifest in 9-12 Cr steel welds. Compressive stresses were found in the weld metal coinciding with the last weld bead to be deposited. Constrained cooling tests on test coupons illustrated that these compressive stresses can be explained in terms of the influence that solid-state phase transformations have on the accumulation of stress in welds.
机译:在这项研究中,通过中子衍射法测量了铁素体-马氏体电厂钢的管环焊缝中的残余应力,并将其与焊接区域中相应的冶金区进行了比较。已经发现,在焊接时和焊接后热处理条件下,最大拉伸应力都位于热影响区(HAZ)的外边界附近,并朝向焊缝根部区域。整个热影响区(包括细晶粒和临界间退火区)都存在较大的直接拉伸应力和静液压应力,在这些区域中,IV型蠕变失效在9-12 Cr钢焊缝中表现出来。在与待沉积的最后焊道相吻合的焊缝金属中发现了压应力。对试样进行的冷却测试表明,这些压缩应力可以用固态相变对焊缝应力累积的影响来解释。

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