Fracture Toughness Characterization of HSLA Steel Weldments

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Authors
  1. Pussegoda, N.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);BMT Fleet Technology Limited, Kanata Ont (CAN)
Abstract
High Strength Low Alloy Steel with a minimum specified yield strength (SMYS) of 65 ksi (~450 MPa) (HSLA 65 - ASTM A945 grade 65) has drawn significant interest from Navy and Commercial Shipyards. This is primarily because of weight savings and weldability. It also is intermediate between high strength steels (HSS) with 50 ksi (~450 MPa) SMYS and HSLA 80 with 80 ksi (~550 MPa) SMYS. ASTM A945 grade 65 also specifies a tensile strength of 78-100 ksi (540-690 MPa) and a minimum transversely oriented Charpy impact energy of 70 ft-lb (95 J) at -40°C. The present study demonstrates the influence of loading rate, temperature and crack location on the fracture toughness. While the specimen geometry of the SENB is known to result in conservative fracture toughness values, it clearly demonstrates the deleterious influence of welding on the fracture behaviour in the coarse grained HAZ. In comparison to the coarse grained HAZ, the two weld metals, 101TM and 71HYN, displayed higher toughness.

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Report Number
DRDC-ATLANTIC-CR-2008-178 — Contractor Report
Date of publication
01 Oct 2008
Number of Pages
50
DSTKIM No
CA032253
CANDIS No
531315
Format(s):
CD ROM

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