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Intergranular Strains in Pre-Strained and Welded Pipes

机译:预应变和焊接管中的晶间应变

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Neutron diffraction has been used to investigate the weld residual stresses and the intergranular residual strains in butt-welded 316H pipes. Measurements have been made on pipes subjected to varying degrees of plastic pre-straining before welding, in order to assess the effects of plastic strain on the weld residual stresses and the intergranular strains in the material. The intergranular strains following plastic deformation will also be affected by the annealing effect of the welding. Pipes were initially prepared with plastic strain of 0, 10, 15, 20 and 25% plastic deformation. Thereafter, the pipes were cut in half and welded with a circumferential butt-weld. Bar specimens were extracted from the remote end of the 0, 10, 15, 20 and 25% pre-strained and welded pipes. Cross-weld bar specimens were also machined from the 0 and 20% pre-strained and welded pipes. Neutron diffraction measurements were made at ENGIN-X, ISIS and FRM-II, Munich. The aim of this paper is to evaluate the intergranular strains developed after pre-straining from measurements made in remote bar specimens from the remote-end of the pipes. The annealing effect of the welding cycle on the intergranular strains is also studied, with measurements done at several points on cross-weld bar specimens, obtaining the strain response of different hkl lattice planes. The results show that the {200} and {220} planes are at the extremes of response during loading. Furthermore, the welding thermal cycling relaxed the intergranular strains from the prior plastic deformation.
机译:中子衍射已用于研究对接焊316H管中的焊接残余应力和晶间残余应变。为了评估塑性应变对焊接残余应力和材料中晶间应变的影响,已对在焊接前经受不同程度的塑料预应变的管道进行了测量。塑性变形后的晶间应变也将受到焊接退火效果的影响。最初准备的管的塑性应变为0%,10%,15%,20%和25%。此后,将管道切成两半,并用周向对焊焊接。从0%,10%,15%,20%和25%的预应变和焊接管的远端提取钢筋样品。还从0%和20%的预应变和焊接管中加工出交叉焊接的钢筋试样。在ISIS的ENGIN-X和慕尼黑的FRM-​​II进行中子衍射测量。本文的目的是评估预应变后从管道远端的钢筋样品中获得的晶间应变。还研究了焊接循环对晶间应变的退火效应,并在交叉焊条试样的多个点进行了测量,从而获得了不同hkl晶格平面的应变响应。结果表明,{200}和{220}平面在加载过程中处于响应的极限。此外,焊接热循环从先前的塑性变形中放松了晶间应变。

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