Abstract
The fracture toughness of the HAZ in welds on a HSLA structural steel was assessed by using two types of precracked small-scale fracture-mechanics specimens. The microstructure of the single- and double-pass HAZs was simulated on a Gleeble machine at two different cooling rates. A direct measurement of K Ic was not possible due to the limited size of both kinds of specimens. A suitable adaptation of the loading diagrams was performed in order to produce relevant data about the fracture properties of the investigated sub-zones of the HAZ.
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