Paper Title:
Effect of the HAZ Microstructural Gradient on the Unstable Fracture Behaviour of Welds in a High Strength Steel
  Abstract

This paper presents the results of an investigation aimed at correlating the gradient of microstructures with the mechanisms of fracture and with J-toughness in the heat-affected zone (HAZ) of submerged arc welds on a high strength structural steel. The microstructure of the weld metal is composed of refined acicular ferrite while the microstructure of the coarse grained heataffected zone (CGHAZ) is basically formed by coarse bainite with a small proportion of martensite and primary ferrite in the grain boundary of the large prior austenite grains. A significant decrease in toughness is observed with an increasing incursion of the fatigue crack front into the CGHAZ. The degradation in toughness is definitely brought about by the CGHAZs of the welds, the size and distribution of these zones being relevant factors in the weld performance.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
539-543
DOI
10.4028/www.scientific.net/MSF.514-516.539
Citation
P. Teixeira, A. Loureiro, D. M. Rodrigues, J. Neves, "Effect of the HAZ Microstructural Gradient on the Unstable Fracture Behaviour of Welds in a High Strength Steel", Materials Science Forum, Vols. 514-516, pp. 539-543, 2006
Online since
May 2006
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Price
$32.00
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