Surface Finishing Effect on Stress Corrosion Cracking Test Results of Alloy 600 by Uni-Axial Constant Load Test in Hydrogenated Steam Environment

Abstract Uniaxial constant load (UCL) tests of the nickel-based alloy X750 (UNS N07550) were performed in high-temperature pure water (288°C, 8 ppm dissolved oxygen [DO]) to investigate stress corrosion cracking (SCC) fracture time and the crack initiation process. The SCC fracture was initiated at a stress level below the 0.2% offset yield stress and many small cracks were observed in the middle of the nonfractured test specimens. The distribution of the crack length for each observation time is shown by Weibull probability distributions. Crack initiation and propagation process had different behavior depending on the applied stress level and the stress intensity factor at the crack tip. SCC initiation at the minimum applied stress is discussed with respect to the grain size, which depended on the size of an initial crack.

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Stress Corrosion Cracking of a New Rare- Earth Containing Magnesium Alloy, Elektron21 Compared with AZ91E

Materials Science Forum ◽

10.4028/www.scientific.net/msf.690.361 ◽

2011 ◽

Vol 690 ◽

pp. 361-364 ◽

Cited By ~ 7

Author(s):

Bharat S. Padekar ◽

V.S. Raja ◽

R.K. Singh Raman ◽

Lyon Paul

Keyword(s):

Rare Earth ◽

Magnesium Alloy ◽

Stress Corrosion ◽

Yield Stress ◽

Stress Corrosion Cracking ◽

Constant Load ◽

Corrosion Cracking ◽

Load Test ◽

Nacl Solution ◽

Free Magnesium

Stress corrosion cracking (SCC) of a rare-earth (RE) containing and Al-free magnesium alloy, Elektron21 was studied using constant load test (CLT) in 0.1N NaCl solution saturated with Mg(OH)2.For comparison a common Al-containing and RE-free alloy, AZ91E was investigated. In CLT the threshold stress for SCC (σscc) for AZ91E was found to be 60% of the yield stress, whereas Elektron21 showed immunity to SCC even at stresses in the proximity of yield stress. The susceptibility of AZ91E to SCC and immunity of Elektron21 during CLT have been confirmed by fractography.

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Influence of thermal treatment on the stress corrosion cracking of Alloy 600 in Na2S4O6 solution

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2014.52.8.615 ◽

2014 ◽

Vol 52 (8) ◽

pp. 615-622 ◽

Cited By ~ 1

Author(s):

Young Sik Kim ◽

Roun Lee

Keyword(s):

Thermal Treatment ◽

Stress Corrosion ◽

Stress Corrosion Cracking ◽

Corrosion Cracking ◽

Alloy 600

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Intergranular Stress Corrosion Cracking Damage Model: An Approach and Its Development for Alloy 600 in High-Purity Water

CORROSION ◽

10.5006/1.3584891 ◽

1986 ◽

Vol 42 (2) ◽

pp. 99-105 ◽

Cited By ~ 9

Author(s):

Y. S. Garud ◽

A. R. McIlree

Keyword(s):

Strain Rate ◽

Stress Corrosion ◽

Stress Corrosion Cracking ◽

High Purity ◽

Corrosion Cracking ◽

Model Parameters ◽

Alloy 600 ◽

Intergranular Stress Corrosion ◽

Film Rupture ◽

Intergranular Stress Corrosion Cracking

Abstract A logical approach to quantitative modeling of intergranular stress corrosion cracking (IGSCC) is presented. The approach is based on the supposition (supported partly by experimental and field observations, and by a related plausible underlying mechanism) that strain rate is a key variable. The approach is illustrated for the specific case of NiCrFe Alloy 600 in high-purity water. Model parameters are determined based on the constant stress IGSCC data (between 290 and 365 C) assuming a power law relation between the damage and the nominal strain rate. The model may be interpreted in terms of a film rupture mechanism of the corrosion process. The related mechanistic considerations are examined for the specific case. Resulting calculations and stress as well as temperature dependence are shown to be in good agreement with the data. More data are needed for further verification under specific conditions of interest.

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