Ductile to Brittle Transition Behaviour of HSLA-65 Steel Welds – Dynamic Tear Testing

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Authors
  1. Aucoin, N.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
HSLA-65 steel (ASTM A945, grade 65 [1]) is regarded as an excellent naval ship steel. The use of this steel in future naval platforms, which may be required to serve in Arctic conditions, requires a detailed knowledge of the steel’s low temperature mechanical properties, particularly when the steel is welded. A previous study on the transition temperature, conducted by Bayley and Mantei [2], showed that the transition temperature was significantly higher than the requirement of -40°C in the heat affected zone of flux-cored arc welding (FCAW) welds. The current study re-examines the transition behaviour of HSLA-65 welds using dynamic tear testing, where specimens are significantly larger than in Charpy tests and could more accurately predict the behaviour of large scale structures. The current study also examines an alternate approach for determining the energy absorbed during a dynamic tear test using the integral definition of work. The results of this study show that transition temperatures determined through dynamic tear testing are much higher than those determined through Charpy impact testing. Several areas of each weld were tested. In all cases, the fusion line of the weld was found to have the highest transition temperature, the heat affected zone was found to have the lowest transition temperature, and the weld metal fell somewhere in between. Based on a transition temperature requirement of less than -40°C, none of the welds tested was found to be fit for servic

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Report Number
DRDC-ATLANTIC-TM-2010-220 — Technical Memorandum
Date of publication
01 Jan 2011
Number of Pages
62
DSTKIM No
CA035604
CANDIS No
535332
Format(s):
Electronic Document(PDF)

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