HAZ softening in Nb-, Ti- and Ti + V-bearing quenched and tempered steel welds

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• 作者：Lei Zhang ; Thomas Kannengiesser
• 刊名：Welding in the World
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：60
• 期：2
• 页码：177-184
• 全文大小：1,755 KB
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• 作者单位：Lei Zhang (1)
  Thomas Kannengiesser (1)
  
  1. Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205, Berlin, Germany
  
• 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

Three high-strength Nb-, Ti- and Ti + V-microalloyed S690QL steels were welded to investigate the formation of softened HAZ and its impact on tensile properties. The welding was performed with three levels of heat input to produce softened zones with different characteristics (softening width, minimum hardness and softening ratio), and then, further tensile tests were done to study their influence on weld performance. The results showed that Ti bearing steel exhibited the lowest resistance to softening with the presence of largest soften width and lowest hardness value, causing final tensile failure occurred at softened HAZ. The metallurgical reason for the lower hardness is the high fraction of coarse ferrite. Nb- and Ti + V-bearing steels suffered moderate softening, due to high hardenability with addition of Mo, Nb and V, but the softening effect did not remarkably influence the tensile properties of these two steels.