Notch Toughness and Retained Austenite in 9% Ni Steel Welds Using Ferritic Filler Metals

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The retained austenite and V-Charpy toughness of the weld metal, the weld bond and the heat-affected zone (HAZ) of 9% Ni steel welds were investigated. 20 mm thick test plates were welded using the automatic gas tungsten-arc process and a ferritic filler metal having chemical compositions similar to those of the base metal. The weld specimens were prepared by deposition of single pass and multi-pass weld beads into single bevel groove of the base metal. Some of the single pass weld specimens were heated at 550℃, 600℃, and 650℃ for 1 hr in order to evaluate the influence of the post weld heat treatment. The heat treatment at 600℃ resulted in a peak value of toughness at the weld bond as well as large amounts of retained austenite, 10-17%, at the weld bond and the HAZ. The austenite produced in this condition, however, was unstable and decreased to less than 10% by subzero treatment at -196℃. In the multi-pass ueld specimens, both the HAZ and the weld metal showed high toughness comparable with that of the base metal, and the other bond toughness of a half size specimen including the primary bead was excellent because of being adequately affected by heat histories of the subsequent passes. A sufficient amount of the austenite was present in all welds of the multi-pass specimen as a consequence of tempering due to the subsequent passes, though the weld heat cycles were relatively short comparing with furnace heat cycles. From the results obtained above, it was found that there was a considerable correlation between the thermally stable austenite and the notch toughnses in the weld zone.
社団法人溶接学会の論文
1981-04-01

Notch Toughness and Retained Austenite in 9% Ni Steel Welds Using Ferritic Filler Metals

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