Crack Tip Opening Displacement (CTOD) Testing Method for Heat-Affected Zone (HAZ) Toughness of Steel Welds with Particular Reference to Local Inhomogeneity

TL;DRAbstract

In the multi-passed weld heat-affected zone (HAZ), the occurrence of mechanical and metallurgical heterogeneity is inevitable. For the fracture toughness evaluation of the steel weld HAZ, the effect of the inhomogeneity shall be considered, particularly in relation to determination of the appropriate testing procedures such as the extraction of test specimens from welded joints. In the weld HAZ of the recently developed high strength steels, the occurrence of the local brittle zones (LBZs) and the local hard/soft zones is often observed. The effect of local heterogeneity is an important problem to be solved to clarify the testing methods and understand the significance of toughness obtained by a specific toughness testing method. In this paper, two kinds of heterogeneity, that is, heterogeneity in toughness and strength mismatch, will be considered. The toughness value is significantly dependent on the specimen types and the extraction method of specimen from the multi-passed welded jo

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