Abstract
AbstractThe dynamic toughness properties of three plates of the same grade of a high strength low alloy pipeline steel were evaluated by impact testing DWTT and CVN specimens sampled from the plates at 45° to the rolling direction. Impact testing was performed on either a conventional pendulum-type Charpy test machine or a Dynatup 8000 instrumented Drop- Weight Test Machine, at temperatures down to - 80°C. The shear fracture mode was found to be dependent on the type of specimen tested, and the ratio of crack initiation energy to the crack propagation energy expended in breaking a standard DWTT specimen appeared to provide a more definite indication of the onset of brittle fracture than either the shear area or total energy by itself. Resume Les proprietes de tenacite dynamique de trois plaques du meme type d'acier microallie ont ete examinees d'apres l'essai par choc d'echantillons DWTT et CVN preleves it 45° de la direction du laminage. Les essais ont ete realises soit sur une machine Charpy conventionn...
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