Susceptibility of titanium- and niobium-free steels of the 18-9 and 18-12 type to intergranular corrosion and stress-corrosion cracking

1968 ◽  
Vol 3 (1) ◽  
pp. 59-62 ◽  
Author(s):  
V. N. Tulyaev ◽  
N. D. Lebedeva
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Intergranular Corrosion ◽  
Corrosion Cracking

scholarly journals Intergranular Corrosion and Stress Corrosion Cracking of Cold-Rolled Zircaloy-2.

1994 ◽  
Vol 43 (488) ◽  
pp. 551-555
Author(s):  
Hitoshi UCHIDA ◽  
Shozo INOUE ◽  
Kazuyuki MORIMOTO ◽  
Keiji KOTERAZAWA
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Intergranular Corrosion ◽  
Corrosion Cracking ◽  
Cold Rolled

Use of Accelerated Intergranular Corrosion Tests and Pitting Corrosion Tests to Detect Sensitization and Susceptibility to Intergranular Stress Corrosion Cracking in High Temperature Water of Duplex 308 Stainless Steel

CORROSION ◽  
1981 ◽  
Vol 37 (2) ◽  
pp. 104-115 ◽  
Author(s):  
T. M. Devine ◽  
B. J. Drummond
Keyword(s):  
Stainless Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Pitting Corrosion ◽  
Intergranular Corrosion ◽  
Corrosion Cracking ◽  
Intergranular Stress Corrosion ◽  
Corrosion Tests ◽  
Duplex Alloy ◽  
Intergranular Stress Corrosion Cracking

Abstract The ability of various intergranular corrosion and pitting corrosion tests to detect sensitization and intergranular stress corrosion cracking susceptibility in high temperature water of duplex 308 stainless steel was evaluated. The duplex alloy contained 10 v/o ferrite and had a specific austenite-ferrite interfacial area of 930 cm2/cm3. The intergranular corrosion resistance of the alloy following 30 different aging treatments was determined in boiling acidified CU-CUSO4 solution (A262E), boiling 65% HNO3 (A262C), and by an electrolytic etch test in 10% oxalic acid (A262A). The pitting corrosion resistance was evaluated by potentiodynamic and galvanostatic tests in 0.1 N HCl at room temperature. The results of all five tests were compared to the results of slow extension rate stress corrosion cracking tests conducted at 550 F in high purity water containing 8 ppm dissolved oxygen. The microstructural features responsible for the corrosion in each test were determined. The A262E test was found to attack the chromium depleted zones in the material. The A262C test preferentially corroded the chromium depleted zones but also dissolved, albeit to a much less extent, the chromium rich phases such as M23C6. The A262A test primarily attacked chromium rich phases. Pitting corrosion was confined to the chromium depleted zones. The results of the A262E test and the galvanostatic pitting test agreed quite closely with the results of the stress corrosion cracking test. There was considerable scatter in the weight loss measurements obtained in the A262C test. The latter could detect the presence of a severely sensitized microstructure but was incapable of distinguishing between mildly sensitized and unsensitized materials. Although pitting was largely confined to the chromium depleted boundaries, unless the sample was severely sensitized, there was considerable scatter in the measured values of the pitting potential. This precluded the use of the latter as a parameter to characterize the degree of sensitization. The A262A test results exhibited the least correlation with the results of the stress corrosion cracking tests. Since the A262A test attacks chromium rich phases such as M23C6, samples which were aged long enough to intergranularly precipitate M23C6 but not long enough to produce chromium depleted zones of sufficient width or contiguity, nevertheless were severely corroded in the A262A test. And samples which were aged long enough to replenish the chromium depleted zones still failed the A262A test because of the continued presence of the chromium rich grain boundary carbides. These tests were also conducted on samples of sensitized and unsensitized austenitic 308 stainless steel. The results were consistent with the findings of the duplex alloy tests.

Intergranular Corrosion and Stress Corrosion Cracking of Sensitised AA5182

2006 ◽  
Vol 519-521 ◽  
pp. 641-646 ◽  
Author(s):  
Alison J. Davenport ◽  
Yudie Yuan ◽  
Rajan Ambat ◽  
Brian J. Connolly ◽  
Martin Strangwood ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Intergranular Corrosion ◽  
Corrosion Cracking ◽  
Critical Factors ◽  
Phase Precipitation ◽  
Β Phase ◽  
Grain Boundary Plane ◽  
Corrosion Susceptibility ◽  
Variable Precipitation

AA5182 (Al-4.5 wt% Mg) can become susceptible to intergranular corrosion (IGC) with time at moderately elevated service temperatures owing to precipitation of Mg-rich β-phase at grain boundaries, which can lead to stress corrosion cracking (SCC). The IGC and SCC susceptibility of AA5182 was found to depend strongly on sensitisation heat treatments. AFM and TEM studies demonstrated that the degree of precipitation and thus susceptibility to attack for a boundary can be related to its crystallographic misorientation. Low angle boundaries (<20°) are most resistant to attack as they do not show β-phase precipitation. However, higher angle boundaries show highly variable precipitation and corrosion susceptibility: critical factors are the grain boundary plane and precipitate/matrix crystallographic relationship.

Effect of Trace Element Erbium on Corrosion Resistance Properties of Al-Zn-Mg-Cu Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 663-667 ◽  
Author(s):  
Xu Dong Wang ◽  
Zuo Ren Nie ◽  
Shuang Ping Lin ◽  
Xue Kuan Su ◽  
Ze Bing Xing
Keyword(s):  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Intergranular Corrosion ◽  
Corrosion Test ◽  
Optical Microscope ◽  
Corrosion Cracking ◽  
Cracking Resistance ◽  
Cu Alloy ◽  
As Stress

The intergranular corrosion and stress corrosion cracking resistance of Al-Zn-Mg-Cu alloy with trace Er addition were studied by means of such methods as stress corrosion cracking and intergranular corrosion test in GB-T7998-2005 and HB5254-83. The microstructures were observed by optical microscope and scanning electron microscope (SEM). The results show that alloys with trace Er addition have been improved on intergranular corrosion and stress corrosion cracking resistance, but corrosion resistance of alloys can be descending when Er addition exceed 0.4%.

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