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Welding characteristics of ultrahigh strength steel in annealed and quench-tempered conditions

Roshanghias, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-009-9586-4
  3. Abstract:
  4. In this research, the welding characteristics of a new UHSLA steel, 35NiCrMoV123, have been studied in two general conditions (annealed and quench-tempered). Carbon equivalent value of 35NiCrMoV123 steel is near 0.9 which classifies it as a "very difficult to weld" steel. The effects of welding heat treatment cycle (preheat, interpass, and postheat) on metallurgical and mechanical properties of weldments have been investigated by tensile, impact toughness, and hardness tests, as well as optical microscopy observations. It has been observed that by employing high-temperature stress relief (600 °C), welding could be performed in annealed condition successfully. Also, the results indicate that by applying precise welding heat treating cycle (preheat, interpass, and postheat temperature at 310 °C) in order to obtain lower bainitic microstructure in HAZ, also employing high-temperature stress relief (600 °C), welding in quench-tempered condition could be successfully performed
  5. Keywords:
  6. 35NiCrMoV123 ; Bainitic microstructures ; Carbon equivalent ; Cold cracking ; Hardness test ; Heat treating ; Heat treatment cycle ; High temperature stress ; Metallurgical and mechanical properties ; Ultra high strength steel ; Welding characteristics ; Weldments ; Annealing ; Hardness testing ; High strength steel ; Optical microscopy ; Stress relief ; Tensile strength ; Toughness ; Welding ; Steel metallurgy
  7. Source: Journal of Materials Engineering and Performance ; Volume 19, Issue 7 , 2010 , Pages 963-969 ; 10599495 (ISSN)
  8. URL: http://link.springer.com/article/10.1007%2Fs11665-009-9586-4