THE EFFECT OF WELD CHEMISTRY ON THE LIKELY PRIMARY WATER STRESS CORROSION CRACKING SUSCEPTIBILITY OF ALLOY 82 DISSIMILAR METAL WELDS
39th Annual CNS-CNA Student Conference - 2015 June 01


Presented at:
39th Annual CNS-CNA Student Conference
2015 June 01
Location:
Toronto, Canada
Session Title:
Student Session

Authors:
S. Persaud (University of Toronto)
S. Ramamurthy (University of Toronto)
R. Newman (University of Toronto)
  

Abstract

Alloy 82 dissimilar weld joints between carbon steel and Alloy 600 were exposed to a simulated primary water environment consisting of hydrogenated steam at 480 °C and 1 bar. Dilution from the carbon steel to the weld was significant, particularly in the root where Fe was enriched to 35 at. % and Cr was depleted to 10 at. %. The heterogeneous composition of the weld from root to crown resulted in differences in internal and external oxidation tendency. An Fe-rich external surface oxide formed on the weld root which may help to prevent embrittlement and SCC by internal intergranular oxidation.

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