Detection of Susceptibility of Alloy 26-1S to Intergranular Attack

2009 ◽  
pp. 197-197-36 ◽  
Author(s):  
AJ Sweet
Keyword(s):  
Intergranular Attack

The Effect of Sigma Phase vs Chromium Carbides On the Intergranular Corrosion Of Type 316 and 316L Stainless Steel (Part 2—Laboratory Investigation)★

CORROSION ◽  
1959 ◽  
Vol 15 (5) ◽  
pp. 17-28 ◽  
Author(s):  
DONALD WARREN
Keyword(s):  
Stainless Steel ◽  
Intergranular Corrosion ◽  
Sigma Phase ◽  
316L Stainless Steel ◽  
Steel Part ◽  
Intergranular Attack ◽  
Acid Media ◽  
Chromium Carbides ◽  
Type 316L ◽  
Stainless Steel Part

Abstract A laboratory study was made of the intergranular corrosion behavior of Types 316 and 316L stainless steel in 14 different acid environments. Included were nitric, nitric-hydrofluoric, acetic, citric, sulfuric, lactic, oxalic, formic and phosphoric acids. Results of this study showed that sensitized or welded Type 316L had excellent resistance to intergranular attack in all of the acid media except nitric. This was true despite the presence of a continuous network of sigma phase in the grain boundaries of the sensitized steel. In contrast, Type 316 having a continuous grain boundary network of chromium carbides underwent severe intergranular corrosion in 12 of the 14 environments studied. 3.2.2

Examinations of Oxidation and Sulfidation of Grain Boundaries in Alloy 600 Exposed to Simulated Pressurized Water Reactor Primary Water

2013 ◽  
Vol 19 (3) ◽  
pp. 676-687 ◽  
Author(s):  
D.K. Schreiber ◽  
M.J. Olszta ◽  
D.W. Saxey ◽  
K. Kruska ◽  
K.L. Moore ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Alloy 600 ◽  
Pressurized Water Reactor ◽  
Intergranular Attack ◽  
Pressurized Water ◽  
Primary Water

AbstractHigh-resolution characterizations of intergranular attack in alloy 600 (Ni-17Cr-9Fe) exposed to 325°C simulated pressurized water reactor primary water have been conducted using a combination of scanning electron microscopy, NanoSIMS, analytical transmission electron microscopy, and atom probe tomography. The intergranular attack exhibited a two-stage microstructure that consisted of continuous corrosion/oxidation to a depth of ~200 nm from the surface followed by discrete Cr-rich sulfides to a further depth of ~500 nm. The continuous oxidation region contained primarily nanocrystalline MO-structure oxide particles and ended at Ni-rich, Cr-depleted grain boundaries with spaced CrS precipitates. Three-dimensional characterization of the sulfidized region using site-specific atom probe tomography revealed extraordinary grain boundary composition changes, including total depletion of Cr across a several nm wide dealloyed zone as a result of grain boundary migration.

Relationship Between Acid Intergranular Corrosion and Caustic Stress Corrosion Cracking of Alloy 600

CORROSION ◽  
1977 ◽  
Vol 33 (1) ◽  
pp. 20-26 ◽  
Author(s):  
G. J. THEUS
Keyword(s):  
Heat Treatment ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Alloy 600 ◽  
Intergranular Attack ◽  
Electrochemical Tests ◽  
Stress Relieving ◽  
Service Conditions ◽  
The Relationship

Abstract Modified Streicher and 288 C (550 F) electrochemical caustic stress corrosion tests were performed on Alloy 600 to determine the relationship between acid intergranular attack susceptibility and caustic stress corrosion cracking (SCC) susceptibility. Mill annealed and solution annealed materials with and without a subsequent 621 C (1150 F) heat treatment (simulated stress relief) were evaluated. Susceptibility to attack in the Streicher test was greatest for material that had received a 621 C (1150 F) heat treatment, whereas this heat treatment caused the same material to be least susceptible to cracking in the electrochemical tests. The conclusions drawn from these results are: (1) stress relieving Alloy 600 does improve its resistance to caustic SCC, and (2) resistance of Alloy 600 to acid intergranular attack does not imply resistance of Alloy 600 to caustic SCC. Therefore, the results demonstrate the need for selecting corrosion qualification tests which are relevant to service conditions.

Post-Leaching Studies of Defect Rodlets

2003 ◽  
Author(s):  
D. H. Wegen ◽  
D. Papaioannou ◽  
J.-P. Glatz ◽  
P. D. W. Bottomly ◽  
M. Amme ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Optical Microscopy ◽  
Fission Products ◽  
Intergranular Attack ◽  
Mox Fuel ◽  
Metallographic Observation ◽  
History Of ◽  
Release Data

UO2 and MOX fuel rodlets are examined by optical microscopy after 5 years leaching in water to correlate the irradiation history of the fuels and of the fuel behaviour and with the release data for fission products and actinides. Metallographic observation revealed a strong intergranular attack of the MOX fuel in contrast to UO2. The latter effect could be responsible for the particularly high releases from the MOX fuel (upto 12% of the Cs inventory), compared to the UO2 fuel (only 0.6% of the Cs inventory). The large inventory of volatile fission products at grain boundaries can be explained by the high linear power rating (350 W/cm) with extremely high central temperatures in the MOX fuel during the irradiation.

Intergranular Attack Observed in Radiation-Enhanced Corrosion of Mild Steel

CORROSION ◽  
1988 ◽  
Vol 44 (9) ◽  
pp. 632-637 ◽  
Author(s):  
R. J. Reda ◽  
S. L. A. Hana ◽  
J. L. Kelly
Keyword(s):  
Mild Steel ◽  
Intergranular Attack
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