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SCC of Alloy 152/52 Welds Defects, Repairs, Dilution Zones and HAZs in PWR Water

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Stress corrosion cracking (SCC) has been observed for over six decades in light water reactors structural components, with wide variations in the rate of SCC initiation and crack growth. Newer materials have been adopted in the last three decades, primarily the ~30% Cr Alloy 690 (UNS N06690) and its weld metals, Alloy 52 (UNS W86052) and Alloy 152 (UNS W86152). These materials were initially viewed as immune to SCC, but are now recognized to be susceptibility to SCC, and can exhibit high growth rates in some conditions. 

Product Number: ED22-17243-SG
Author: Peter L. Andresen, Chris Wax
Publication Date: 2022
$20.00
$20.00
$20.00

Extensive, on-going SCC growth rate evaluation has been performed of Alloy 52/152 welds, including new compositions, a variety of weld repairs, weld defects, re-fuse passes, and in the dilution zone and the low alloy steel heat affected zone. Narrow regions, such as heat affected zones and dilution zones, are challenging to study and the results are generally ambiguous because of the undulating nature of most weld fusion lines and complex, swirling dilution in the first welding pass. To complement the dilution zone measurements, SCC studies on bulk, dualwire welds of intermediate composition were also evaluated, and showed the expected strong effect of Cr concentration. Only low and very low SCC growth rates were observed in the weld
metals. In one case, medium growth rates were observed over extended times and growth increments in a temper bead weld heat affected zone of low alloy steel.



Extensive, on-going SCC growth rate evaluation has been performed of Alloy 52/152 welds, including new compositions, a variety of weld repairs, weld defects, re-fuse passes, and in the dilution zone and the low alloy steel heat affected zone. Narrow regions, such as heat affected zones and dilution zones, are challenging to study and the results are generally ambiguous because of the undulating nature of most weld fusion lines and complex, swirling dilution in the first welding pass. To complement the dilution zone measurements, SCC studies on bulk, dualwire welds of intermediate composition were also evaluated, and showed the expected strong effect of Cr concentration. Only low and very low SCC growth rates were observed in the weld
metals. In one case, medium growth rates were observed over extended times and growth increments in a temper bead weld heat affected zone of low alloy steel.



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