Microstructure-dependent fracture toughness (JIC) variations in dissimilar pipe welds for pressure vessel system of nuclear plants

In present study, dissimilar metal weld (DMW) joints between SA508Gr.3cl.1 ferritic steel and SS304LN pipes were prepared using Inconel 82/182, and Inconel 52/152 consumables. Metallurgical properties and their influence on fracture toughness of weldment regions and interfacial regions could play a...

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Bibliographic Details
Published in:Journal of nuclear materials 2017-09, Vol.493, p.412-425
Main Authors: Rathod, Dinesh W., Pandey, Sunil, Singh, P.K., Kumar, Suranjit
Format: Article
Language:English
Subjects:
Assessment procedure
Crack growth
Dissimilar material joining
Dissimilar metals
Ferritic stainless steels
Fracture toughness
Integrity
Interface
Metallurgical analysis
Microstructure
Nickel
Nickel base alloys
Nuclear power plants
Pipe joints
Pipes
Sigma phase
Structural integrity
Studies
Superalloys
Welded joints
X-ray diffraction
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Summary:In present study, dissimilar metal weld (DMW) joints between SA508Gr.3cl.1 ferritic steel and SS304LN pipes were prepared using Inconel 82/182, and Inconel 52/152 consumables. Metallurgical properties and their influence on fracture toughness of weldment regions and interfacial regions could play a significant role in integrity assessment of these joints. Ni-based consumables exhibit complex metallurgical properties at interfacial regions. The metallurgical characterization and fracture toughness studies of Inconel 82/182 and Inconel 52/152 joints have been carried out for determining the optimum consumable for DMW joint requirements and the effect of microstructure on fracture toughness in weldment regions. The present codes and procedures for integrity assessment of DMW joints have not given due considerations of metallurgical properties. The requirements for metallurgical properties by considering their effect on fracture toughness properties in integrity assessment have been discussed for reliable analysis. Inconel 82/182 is preferred over Inconel 52/152 joints owing to favorable metallurgical and fracture toughness properties across the interfacial and weldment regions. •Carbon depletion in HAZ can affect the fracture toughness.•Dendrites and crystallographic planes have effect on crack growth resistance.•Metallurgical properties at interfacial region influence the crack path and growth.•Hard sigma phase formation is pronounced in Inco52/152 than Inco82/182.•Based on metallurgical and fracture toughness properties Inco82/182 are preferred over Inco52/152.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2017.06.038