On the effects of austenite phase transformation on welding residual stresses in non-load carrying longitudinal welds
On the effects of austenite phase transformation on welding residual stresses in non-load carrying longitudinal welds
复制标题
DOI：
10.1007/s40194-014-0190-3
复制
发表时间：
2015-03-01
影响因子：
2.1
通讯作者：
Dilger, Klaus
中科院分区：
文献类型：
--
作者：
Hensel, Jonas;Nitschke-Pagel, Thomas;Dilger, Klaus
残余应力影响焊接结构和构件的疲劳强度。用于研究残余应力效应的常见样品类型是角焊纵向扣板。这种试样类型在疲劳试验中显示出显著的残余应力效应。但该试样残余应力产生的机理尚不明确。在靠近焊趾的表层存在高拉伸残余应力，不能用实验方法证明，但通常是假设的。本文介绍了焊接残余应力产生的实验和数值研究结果。制作了单层和多层角焊缝以及简化弯曲多层沉积焊缝的试样，研究了残余应力的积累。在焊接过程中进行了温度测量，考察了奥氏体相变的影响。残余应力已通过表面x射线衍射和试样厚度上的中子衍射测定。此外，残余应力积累的机制已通过有限元计算进行了评估。结果表明，奥氏体相变对焊缝趾部残余应力也有显著影响。
Residual stresses affect the fatigue strength of welded structures and components. A common sample type used for studies on residual stress effects is the fillet-welded longitudinal gusset. This sample type shows in fatigue tests significant residual stress effects. But the mechanisms of residual stress generation are not clarified for this sample type yet. High tensile residual stresses in the surface layer near the weld toe could not be proven by experimental methods but are generally assumed. Here presented are results from experimental and numerical investigations on welding residual stress generation. Specimens with single and multilayer fillet welds have been produced as well as simplified curved multilayer deposition welds studying residual stress build-up. Temperature measurements have been conducted during welding examining the influence of austenite phase transformation. Residual stresses have been determined by means of X-ray diffraction at the surface as well as by neutron diffraction over specimen thickness. Further, the mechanisms of residual stress build-up have been evaluated by finite element calculations. It could be shown that the austenite phase transformation has significant effect on the residual stresses near the weld toe also for this sample type.