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51312-01924-Linking Grain Boundary Microstructure and Microchemistry to Stress Corrosion Cracking of Cold Rolled

Picture for Linking Grain Boundary Microstructure and Microchemistry to Stress Corrosion Cracking of Cold Rolled
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Product Number: 51312-01924-SG
ISBN: 01924 2012 CP
Author: Stephen Bruemmer
Publication Date: 2012
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Grain boundary microstructures and microchemistries are examined in cold-rolled alloy 690 tubing and plate materials and comparisons are made to intergranular stress corrosion cracking (IGSCC) behavior in PWR primary water. Chromium carbide precipitation was found to be a key aspect for materials in both the mill annealed and thermally treated conditions. Cold rolling to high levels of reduction was discovered to produce extremely high dislocation densities along with small IG voids and cracked precipitates in alloys with grain boundary carbides. The degree of permanent grain boundary damage from cold rolling was found to depend directly on the initial IG carbide distribution. For the same degree of cold rolling alloys with few IG precipitates exhibited much less permanent damage and lower SCC growth rates. However crack tip examinations revealed that cracked carbides appeared to blunt propagation of IG cracks in many cases. Preliminary results suggest that the localized grain boundary strains and stresses produced during cold rolling promote IGSCC susceptibility and not the cracked carbides and voids.

Grain boundary microstructures and microchemistries are examined in cold-rolled alloy 690 tubing and plate materials and comparisons are made to intergranular stress corrosion cracking (IGSCC) behavior in PWR primary water. Chromium carbide precipitation was found to be a key aspect for materials in both the mill annealed and thermally treated conditions. Cold rolling to high levels of reduction was discovered to produce extremely high dislocation densities along with small IG voids and cracked precipitates in alloys with grain boundary carbides. The degree of permanent grain boundary damage from cold rolling was found to depend directly on the initial IG carbide distribution. For the same degree of cold rolling alloys with few IG precipitates exhibited much less permanent damage and lower SCC growth rates. However crack tip examinations revealed that cracked carbides appeared to blunt propagation of IG cracks in many cases. Preliminary results suggest that the localized grain boundary strains and stresses produced during cold rolling promote IGSCC susceptibility and not the cracked carbides and voids.

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