QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Print ISSN : 0288-4771
Characteristics of Disbonding and Carbide Precipitation of Stainless Overlay Weld
Study on a Stainless Steel Overly Welding Process for Superior Resistance to Disbonding
Akiyoshi FujiEtsuo KudoTomoyuki Takahashi
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1986 Volume 4 Issue 4 Pages 772-778

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Abstract

The first layer overlay weld metal with austenitic/martensitic duplex microstructure provides the overlay welds with better resistance to the hydrogen-induced disbonding than that with the conventional austenitic microstructure containing several percents ferrite as previously reported.
The resistance to the hydrogen-induced disbonding occurring at the bond of the stainless steel overlay weld is affected by the carbide precipitated at the bond region.
Based on this consideration, the properties of the disbonding surface and the carbide precipitation of the disbonding resistant overlay weld were studied and compared with those of the conventional overlay weld.
The main results obtained in this study are as follows:
(1) The disbonding mainly occurred at the bond in the disbonding resistant overlay weld, while it occurred at coarse grain boundaries in the first layer weld metal adjacent to the bond in the conventional overlay weld.
(2) Fine M23C6 carbides precipitated in the first layer weld metal adjacent to the bond in the disbonding resistant overlay weld.
(3) Large M23C6 carbides precipitated at the coarse grain boundary in the conventional overlay weld.
(4) The amount of precipitated carbide of the disbonding resistant overlay weld was almost equal to that of the conventional overlay weld.

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