On the effects of austenite phase transformation on welding residual stresses in non-load carrying longitudinal welds

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• 作者：Jonas Hensel (1)
  Thomas Nitschke-Pagel (1)
  Klaus Dilger (1)
  
  1. Institute of Joining and Welding ; Technische Universit盲t Braunschweig ; Langer Kamp 8 ; Braunschweig ; Germany
  
• 关键词：Residual stresses ; Longitudinal welds ; X ; rays ; Neutron radiation ; Diffraction ; Austenite
• 刊名：Welding in the World
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：59
• 期：2
• 页码：179-190
• 全文大小：2,075 KB
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• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669

文摘

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.