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- W137333302 abstract "The effects of post weld heat treatment (PWHT) on the toughness of shielded metal arc weld (SMAW) metal is investigated. Two C-Mn and two C-Mn-Ni electrodes, chosen from a previous consumable evaluation program, were each used to make four butt welds in a 40 mm thick C-Mn microalloyed steel. One half of each joint was given a PWHT of 2 h at 600°C. Sub-surface and root region Charpy specimens, full thickness, BX2B, CTOD specimens and all weld metal tensile specimens were removed from each test condition (as-welded and PWHT) for all four welds and tested. All four welds showed a decrease in Charpy energy, in the as-welded condition, in the root region when compared with the sub-surface location, as a result of dynamic strain aging. There was no change in Charpy toughness after PWHT for the C-Mn weld metals while the C-Mn-Ni weld metals showed a loss of toughness. Examination of the welds indicates that a softening of ferrite microstructures and removal of strain aging effects with PWHT, which would lead to an improvement in toughness, was counteracted by embrittlement by carbide precipitation. The presence of Ni in the C-Mn-Ni welds is thought to increase the amount of martensite-austenite (M-A) phase present in the as-welded structure compared with C-Mn weld metal, and hence results in more carbide precipitates in the PWHT condition. Three of the four welds showed an improvement in toughness, measured by CTOD, after PWHT. The lack of improvement of one of the C-Mn-Ni welds may be due to a change of cleavage initiation from inclusions to coarsened carbides." @default.
- W137333302 created "2016-06-24" @default.
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- W137333302 date "1986-01-01" @default.
- W137333302 modified "2023-10-16" @default.
- W137333302 title "THE EFFECTS OF PWHT ON THE TOUGHNESS OF SHIELDED METAL ARC WELD METALS FOR USE IN CANADIAN OFFSHORE STRUCTURE FABRICATION" @default.
- W137333302 cites W2034559640 @default.
- W137333302 doi "https://doi.org/10.1016/b978-0-08-031866-0.50018-4" @default.
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