Effect of post-weld heat treatment on the fatigue strength of HFMI-treated mild steel joints

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• 作者：M. Leitner ; W. M?ssler ; A. Putz ; M. Stoschka
• 关键词：Fatigue improvement ; Mechanical stress relief ; Post ; weld heat treatment (PWHT) ; Residual stresses ; Weld toes ; Peening
• 刊名：Welding in the World
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：59
• 期：6
• 页码：861-873
• 全文大小：5,280 KB
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• 作者单位：M. Leitner (1)
  W. M?ssler (2)
  A. Putz (2)
  M. Stoschka (1)
  
  1. Mechanical Engineering, Montanuniversit?t Leoben, Leoben, Austria
  2. Siemens AG ?sterreich, Graz, Austria
  
• 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

Welding as a thermo-mechanical joining process generally induces residual stresses and distortion in welded components or structures. Mechanical post-treatment methods as the high-frequency mechanical impact treatment (HFMI) reduces the geometrical notch and introduces compressive stresses in the locally treated weld toe area, whereas post-weld heat treatment (PWHT) globally affects the whole structure. In this paper, the fatigue strength of HFMI-treated transverse non-load-carrying attachments and cruciform joints made of structural mild steel S355 before and after PWHT is investigated. Comprehensive tumescent fatigue tests and evaluation of notch topography, residual stress and distortion show the influence of the investigated post-treatment methods. To analyse the effect of distortion on the resulting stress condition during the fatigue tests, simulations and strain gauge measurements are carried out for different load cases. Finally, a local fatigue assessment based on the effective notch stress approach shows that an additional PWHT is not beneficial for fatigue strength. As an increase in distortion of the samples, and an influence on the base material properties, caused by the heat-treatment is not observable, the decrease in fatigue is mainly caused by the entire relieve of manufacturing induced (as-welded/HFMI-treated) prior compressive residual stresses to an almost zero stress value. Keywords (IIW Thesaurus) Fatigue improvement Mechanical stress relief Post-weld heat treatment (PWHT) Residual stresses Weld toes Peening