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Correlation of Fracture Toughness With Charpy Impact Energy for Low Alloy, Structural Steel Welds

[+] Author Affiliations
Kleber E. Bianchi

Federal University of Rio Grande, Rio Grande, Brazil

Vitor Scarabeli Barbosa, Rafael Savioli, Claudio Ruggieri

University of Sao Paulo, Sao Paulo, Brazil

Paulo Eduardo Alves Fernandes

National Service for Industrial Training (SENAI), Sao Paulo, Brazil

Paper No. PVP2017-65361, pp. V06BT06A003; 11 pages
doi:10.1115/PVP2017-65361
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 6B: Materials and Fabrication
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5800-4
  • Copyright © 2017 by ASME

abstract

Correlations between Charpy impact energy and fracture toughness values have continuously been developed because of their applicability in structural integrity assessment methodologies. This also applies to the integrity analysis of welded joints, which represent material discontinuities and potential failure locus in structures. Therefore, in effective FFS methodology applications, the fracture toughness of welded joints located in critical regions should be accurately estimated. This work addresses an estimation procedure of fracture toughness values based on Charpy impact energy for low alloy, steel welds made from an ASTM A572 Gr 50 base plate material. To produce the welded joints, two processes were used: SMAW and FCAW. To ensure valid toughness test values corresponding to high constraint conditions, a strength overmatched, deeply-cracked SE(B) configuration having a weld centerline notch was adopted. The ductile-to-brittle transition curve was established by means of Charpy tests. Direct CVN correlations with fracture toughness, as well as reference temperature based correlations derived from the Master Curve approach, were evaluated. The obtained results indicate that both correlation procedures are suitable for weld metal toughness estimations based on Charpy data. However, slightly different values of correlation constants than those indicated for the base metal should be employed in the case of the reference temperature method.

Copyright © 2017 by ASME

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