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This report presents the results of a research programme to study the effect of local brittle zones (LBZs) on the fracture behaviour of weldments in FeE550 TM. The work has been concentrated on a 40 mm thick TMCP material (Ti-Nb-V micro-alloyed) and, to a lesser extent on a 12 mm thick hot strip mill material (Nb-V micro-alloyed). On the 40 mm thick material, weld thermal simulation techniques have been used to determine the Charpy-V notch toughness and crack tip opening displacement (CTOD) properties of the various microstructures, corresponding with different locations in the heat affected zone (HAZ) of a weld. In order to be able to correlate the CTOD properties of the real LBZ microstructure with the CTOD properties of the weldments, a LBZ has been produced over the entire plate thickness of a weldment by means of submerged arc strip cladding. The fracture behaviour of the wide plates did not show an influence of the LBZs although microstructural investigation confirmed that LBZs were sampled by the fatigue cracks. The results obtained in this progamme lead to the conclusion the LBZs are only of importance when there is a large difference between the fracture toughness of the coarse grained HAZ and the LBZs.

Additional information

Authors: TER AVEST F, TNO Metaalinstituut, Am Apeldoorn (NL);DAHL W, TNO Metaalinstituut, Am Apeldoorn (NL);VUIK J, TNO Metaalinstituut, Am Apeldoorn (NL);DELEDE F, RWTH-IEhK, Aachen (DE)
Bibliographic Reference: EUR 16698 EN (1997) 204pp., FS, ECU 35.00
Availability: Available from the (2)
ISBN: ISBN 92-828-0956-0
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