Residual stresses in P91 steel electron beam welds
Residual stresses in P91 steel electron beam welds
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DOI：
10.1179/1362171812y.0000000076
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Truman, C. E.
中科院分区：
文献类型：
--
作者：
Kundu, A.;Bouchard, P. J.;Truman, C. E.
本文用中子衍射法和轮廓测量法研究了9mm厚P91铁素体-马氏体钢板电子束焊接残余应力的特征。这项工作的新奇之处在于揭示了残余应力分布在一个精细的长度尺度与一个类似的1毫米宽的融合区。观察到焊接线上的特征性“M”形应力分布，高拉伸峰值刚好超出热影响区/母材边界。由于焊接区冷却过程中的马氏体相变，靠近焊缝中心线的测得应力明显小于相邻峰值的拉伸应力。从残余应力的角度来看，施加第二平滑焊道的效果是不希望的，因为它增加了残余应力的拉伸幅度和扩展。结果是合适的验证电子束焊缝的残余应力的有限元预测从铁素体-马氏体钢。
This paper describes the characterisation of residual stress in electron beam welded P91 ferritic-martensitic steel plates (9 mm thick) by neutron diffraction and contour measurement methods. The novelty of the work lies in revealing the residual stress profile at a fine length scale associated with a similar to 1 mm wide fusion zone. A characteristic 'M' shaped distribution of stresses across the weld line is observed with high tensile peaks situated just beyond the heat affected zone/parent material boundary. Measured stresses close to the weld centreline are significantly less tensile than the adjacent peaks owing to martensitic phase transformation during cool down of the weld region. The effect of applying a second smoothing weld pass is shown to be undesirable from a residual stress standpoint because it increases the tensile magnitude and spread of residual stress. The results are suitable for validating finite element predictions of residual stress in electron beam welds made from ferritic-martensitic steels.