Effect of Heat Treatment and Chemical Composition on Caustic Stress Corrosion Cracking of Alloy 600 and Alloy 690

2000 ◽  
Vol 183-187 ◽  
pp. 707-712 ◽  
Author(s):  
Hong Po Kim ◽  
Seong Sik Hwang ◽  
Yun Soo Lim ◽  
I.H. Kuk ◽  
Ji Soon Kim
Keyword(s):  
Heat Treatment ◽  
Chemical Composition ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Alloy 600 ◽  
Alloy 690

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.

Effect of microstructure on stress corrosion cracking of alloy 600 and alloy 690 in 40% NaOH

2001 ◽  
Vol 7 (1) ◽  
pp. 55-59 ◽  
Author(s):  
H. P. Kim ◽  
S. S. Hwang ◽  
Y. S. Lim ◽  
I. H. Kuk ◽  
J. S. Kim
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Alloy 600 ◽  
Alloy 690 ◽  
Effect Of Microstructure

Stress corrosion cracking of alloy 600 and alloy 690 in hydrogen/steam at 380 °C

1997 ◽  
Vol 39 (3) ◽  
pp. 565-587 ◽  
Author(s):  
G. Sui ◽  
J.M. Titchmarsh ◽  
G.B. Heys ◽  
J. Congleton
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Alloy 600 ◽  
Alloy 690

scholarly journals Effects of Grain Boundary Morphologies on Stress Corrosion Cracking of Alloy 600

2017 ◽  
Vol 62 (2) ◽  
pp. 1415-1419 ◽  
Author(s):  
H.P. Kim ◽  
M.J. Choi ◽  
S.W. Kim ◽  
D.J. Kim ◽  
Y.S. Lim ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Potential ◽  
Corrosion Cracking ◽  
Alloy 600 ◽  
Intergranular Carbide

AbstractEffects of grain boundary morphologies on stress corrosion cracking (SCC) of Alloy 600 have been studied in 40% NaOH at 315°C using C-ring specimens. The configuration of the grain boundary and the intergranular carbide density were controlled by heat treatment. SCC tests were performed at +150 mV above the corrosion potential. The specimen with a serrated grain boundary showed higher SCC resistance than that with a straight grain boundary. This appears to be caused by the fact that the specimen with the serrated grain boundary has longer SCC path. SCC resistance also increased with intergranular carbide density probably due to enhanced relaxation of stress at intergranular carbide.

Electrochemical Interpretation of a Stress Corrosion Cracking of Thermally Treated Ni Base Alloys in a Lead Contaminated Water

2007 ◽  
Vol 124-126 ◽  
pp. 1545-1548 ◽  
Author(s):  
Seong Sik Hwang ◽  
Yun Soo Lim ◽  
Hong Pyo Kim ◽  
Joung Soo Kim ◽  
Larry Thomas
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Lead Ion ◽  
Contaminated Water ◽  
Alloy 600 ◽  
Electrochemical Test ◽  
Alloy 690 ◽  
Corrosion Film ◽  
The Stability

Since the PbSCC(Lead stress corrosion cracking) of alloy 600 tubing materials was reported by Copson and Dean in 1965, the effect of lead on a corrosion film and cracking morphology have been continually debated. An electrochemical interaction of lead with the alloying elements of SG tubings was studied and the corrosion products were analyzed. It was found that lead enhanced the anodic dissolution of alloy 600 and alloy 690 in the electrochemical test. The lead preferentially dissolved the Cr from the corrosion film of alloy 600 and alloy 690 in alkaline water. The lead ion seemed to penetrate into the TG crack tip and react with the corrosion film. A selective Cr depletion was observed to weaken the stability of the passive film on the alloys. Whereas passivity of Ni became stable in lead containing solution, Cr and Fe passivity became unstable.

Weldability, Thermal Aging and PWSCC Behavior of Nickel Weld Metals Containing 15 to 30% Chromium

2004 ◽  
Author(s):  
J. M. Boursier ◽  
F. Vaillant ◽  
B. Yrieix
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Thermal Ageing ◽  
Corrosion Cracking ◽  
Life Assessment ◽  
Alloy 600 ◽  
Head Penetration ◽  
Weld Metals ◽  
Alloy 690 ◽  
Primary Water

In 1991, a vessel head penetration was found leaking at Bugey 3 plant during the hydrotest. Metallurgical investigations confirmed that this problem was again related to primary water stress corrosion cracking of alloy 600. Moreover, the main crack initiated in the base metal of the penetration (alloy 600) has also propagated in the weld metal in alloy 182. More recently, stress corrosion cracking in alloy 182 has been found on welds of U.S. plants. SCC susceptibility of alloy 182 has been evidenced by several laboratories. In France, all original vessel heads using alloy 600 have been or will be replaced with penetrations in alloy 690 (with 30% chromium). With respect to substitution materials, ELECTRICITE´ DE FRANCE has undertaken a large R&D study focusing on the development of new weld metals. The aim of this study was to identify new materials that will be able to weld alloy 690. Weld metals containing 15 to 30% Chromium have been studied. This paper presents an overview of the main results obtained on 19% Cr, 26% Cr and 30% Cr alloys with respect to alloy 182 (15% Cr). Firstly, the weldability of weld metals has been studied focusing on the susceptibility to hot cracking. Secondly, the resistance to thermal ageing has been investigated in order to detect any long term ordering of the solid solution Ni-Cr that could induce embrittlement. Hardness tests, Charpy tests and resistivity measurements did not show any effect of ageing up to 60,000 hours at 360°C. Thirdly, stress corrosion cracking susceptibility in primary water at 360°C has been evaluated during constant load tests, RUB tests, slow strain rate tests. No cracking was observed on material containing more than 26% Cr for both initiation and propagation. Finally, a life assessment was performed for all weld materials with respect to alloy 182.

Stress Corrosion Cracking of Alloys 600, 690, and 800 in a Tetrathionate Solution at 340°C

2007 ◽  
Vol 534-536 ◽  
pp. 745-748
Author(s):  
Eun Hee Lee ◽  
Kyung Mo Kim
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Chromium Content ◽  
Corrosion Cracking ◽  
Bend Test ◽  
Energy Dispersive ◽  
Alloy 600 ◽  
X Ray ◽  
Alloy 800 ◽  
Alloy 690

The stress corrosion cracking (SCC) susceptibility of Alloy 600 MA, Alloy 600 TT, Alloy 800, and Alloy 690 TT were investigated in a deaerated 0.01 M solution of sodium tetrathionate using reverse u-bend test samples at 340 °C. The results showed that SCC occurred in all alloys, excluding Alloy 690 TT. The SCC susceptibility of the alloys increased in the following order: Alloy 690 TT, Alloy 800, Alloy 600 TT, and Alloy 600 MA. The SCC susceptibility decreased with an increase in the chromium content of the alloys. The results of the deposits and spectra taken from an energy dispersive X-ray system confirmed the existence of a reduced sulfur causing SCC.

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