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Creep of austenitic stainless steel welds

  • Papers Presented At The Materials Science Section Of The 82nd Indian Science Congress, Calcutta, 1995
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Abstract

Austenitic stainless steels (SS) find extensive application in power, petrochemical and nuclear industries in view of their excellent elevated temperature mechanical properties, corrosion resistance, formability and weldability. However, they are susceptible to hot cracking during fusion welding. To avoid this problem, chemical composition of the welding consumable is generally adjusted to promote primary ferrite mode of solidification and retain about 3 to 10%δ-ferrite in the as-welded condition. The duplex microstructure of the weld metal undergoes transformation to carbides and a variety of intermetallic phases during elevated temperature service and causes deterioration in the mechanical properties.

This paper presents a comprehensive review of the current understanding of the solidification microstructures, ageing processes and their influence on the creep behaviour of types 308 and 316 SS weld metals. The effects of varying chemical composition,δ-ferrite content, electrode coating and welding processes on creep strength and ductility are examined. Current trends in the design of welded components for creep application are also discussed.

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Authors and Affiliations

  1. Materials Development Division, Indira Gandhi Centre for Atomic Researh, 603 102, Kalpakkam, India

    S L Mannan & M D Mathew

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  1. S L Mannan
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  2. M D Mathew
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Mannan, S.L., Mathew, M.D. Creep of austenitic stainless steel welds. Bull. Mater. Sci. 19, 985–1007 (1996). https://doi.org/10.1007/BF02744632

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