Master curve determination of the fracture transition in a CSA 350WT plate and weld


  1. Hull, D.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
The DREA Dockyard Laboratory Pacific (DL(P)) has an on-going requirement to determine the fracture toughness of ship steels and welds in the ductile to brittle transition temperature range. ASTM Test Method E1921-97 "Determination of Reference Temperature To, for Ferritic Steels in the Transition Range" can be used to generate transition master curves. CSA G21 350WT is a ferritic steel used extensively in the hulls of the Canadian Navy's Halifax class frigates. An earlier contract demonstrated that valid results could be obtained from 350 WT L-T oriented specimens using the ASTM test method. This program was subsequently expanded to investigate the effect of plate orientation (L-T and T-L) and loading rates (quasi-static and intermediate) on both 350WT plate and welds. This work was supplemented by experiments at DL(P) using a drop tower to achieve high deformation rates. The test program was very successful in quantifying the fracture toughness over the temperature range of interest. Both the plate and submerged are weld are very tough, and have very low reference temperatures, suggesting that there is a high resistance to brittle fracture in this material. This data will be useful for damage assessment and fitness-for-purpose assessments in repair situations.
Fracture transition;350WT steel;Transition temperature curves;Reference temperature;Master curve;Ship plate
Report Number
DREA-CR-2000-105 — Contractor Report
Date of publication
01 Aug 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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