International Journal of Fracture

, Volume 185, Issue 1–2, pp 179–185 | Cite as

Brittle crack-arrest fracture toughness in a high heat-input thick steel weld

Letters in Fracture and Micromechanics

Abstract

Brittle crack-arrest fracture toughness (KIa) was determined as a function of the temperature in a large-scale (1 x 1 m) 50-mm thick steel base metal and its high heat-input (32 kJ/mm) weld. An impact initiates crack propagation from a notch at low temperature toward a higher temperature region where the crack stopped due to the improved fracture toughness. The relationship between the toughness and crack-arrest temperature provides the KIa at −10 °C of about 100 MPa√m in the weld specimen, which is a significant decrease compared to that of the base metal (240 MPa√m). Furthermore, the path of the crack propagation was discussed in terms of the grain size, hardness, and Charpy impact energy of the localized crack region.

Keywords

Brittle fracture crack arrest toughness thick steel welds 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Technical Research LaboratoriesPOSCOPohangKorea
  2. 2.Neutron Science DivisionKorea Atomic Energy Research InstituteDaejeonKorea
  3. 3.Department of civil EngineeringChosun UniversityGwanguKorea

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