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Fracture Toughness of the API 5L X65 Steel Submitted to Intercritical Heat Treatments

[+] Author Affiliations
Pedro C. Sant’anna, Ernandes M. Rizzo

Centro Federal de EducaçãoTecnológica, Vitória, ES, Brazil

Samuel Irati N. Gomes

EESC/USP, São Carlos, SP, Brazil

Itamar Ferreira

UNICAMP/FEM, Campinas, SP, Brazil

Paper No. OMAE2002-28115, pp. 81-86; 6 pages
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 3
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3613-4 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME


The intercritical heat treatment effect on the mechanical properties of the API 5L X65 steel, microalloyed with Ti and Nb, widely used in welded structures, was investigated. The embrittlement, observed by several authors in the intercritical region of the heat affected zone of welds performed in HSLA steels, is closely related to the volume fraction of M-A constituent, formed in the cooling. Just upon the homogenization and normalizing heat treatments, the specimens were submitted to different intercritical heat treatments, performed at 780 °C for 30 minutes and cooled with various Δt8/5 rates, with the purpose of varying the microstructure. High fracture toughness was obtained with the lower cooling rate. Also, it was verified that the low M-A constituent volume fraction was not enough to promote reduction on the fracture toughness.

Copyright © 2002 by ASME



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