Influence of Microstructural Inhomogeneity on the Creep Rupture Behaviour of 316LN SS Weld Joints

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• 作者：V. D. Vijayanand ; M. Vasudevan ; K. Laha
• 关键词：Austenitic stainless steel ; Multi ; pass weld Joints ; Creep rupture
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：69
• 期：2
• 页码：217-221
• 全文大小：2,416 KB
• 参考文献：1.Mannan S L, Chetal S C, Raj B, and Bhoje SB, Trans Indian Inst Met 235 (2005) 155.
  2.Brooks J A, and Thompson A W, Int Mater Rev 36 (1991) 16.CrossRef
  3.Vijayanand V D, Laha K, Parameswaran P, Ganesan V, and Mathew M D, Mater Sci Eng A, 607 (2014) 138.CrossRef
  4.Marshall P, Austenitic Stainless Steels: Microstructure and Mechanical Properties, Elseveir, London and New York (1984).
  5.RCC MR Design Code, Section 1, Sub Section Z, French Society for Design and Construction Rules for Nuclear Island Components (2002).
  
• 作者单位：V. D. Vijayanand (1)
  M. Vasudevan (1)
  K. Laha (1)
  
  1. Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Materials Science, general
  Tribology, Corrosion and Coatings
  
• 出版者：Springer India
• ISSN：0975-1645

文摘

The fusion zone is usually the weakest link in austenitic steel weld joints and it is usually in this region where damage initiates during creep deformation. The heterogeneity in microstructure of the fusion zone enhances the complexity in understanding the damage evolution during creep exposure. The major source of heterogeneity in the microstructure is the weld thermal cycle, which the weld joint is inevitably subjected to during multi-pass welding. Subsequent thermal cycles are likely to alter the microstructure of the previously deposited fusion zone thereby influencing the mechanical properties of the joints. In this study, the effect of thermal cycle on creep rupture behaviour of 316LN SS weld joint has been studied. Weld joints were fabricated by two welding processes—activated tungsten inert gas (ATIG) and shielded metal arc (SMA) welding. In case of ATIG weld joints, the creep properties of single and dual-pass weld joints were compared and for the SMAW joints, the comparison was made between weld joints made with two different electrode sizes. In ATIG weld joint, the subsequent thermal cycle in the dual pass weld joint improved its creep rupture life. In the case of the SMAW joint, the weld joint made with larger electrode, which was subjected to less number of thermal cycles exhibited better creep properties. The weld thermal cycle induces a ‘thermo-mechanical treatment’ and changes the morphology of delta ferrite in the previously deposited fusion zone which has a synergistic role in dictating the creep rupture life of the 316LN SS weld joints. Keywords Austenitic stainless steel Multi-pass weld Joints Creep rupture