Stress corrosion cracking

About: Stress corrosion cracking is a research topic. Over the lifetime, 11340 publications have been published within this topic receiving 138157 citations.

Testing Sensitization and Predicting Susceptibility to Intergranular Corrosion and Intergranular Stress Corrosion Cracking in Austenitic Stainless Steels

Abstract: In this paper, degree of sensitization (DOS) of austenitic stainless steels (SS) is defined in terms of the characteristic parameters of the chromium depletion zones: coverage (proportion of the grain boundary length covered by chromium depletion zones), width, and depth (the minimum level of chromium in the depletion zones). A sample matrix was developed that provides heat-treated samples of Type 304 SS (UNS S30400) having the same coverage developed at four different temperatures of heat treatments. The coverage was measured by quantitative metallography. The absolute value of depth was measured by the quantitative potentiostatic electrochemical test. Other electrochemical (potentiodynamic and potentiostatic) techniques were used to assess the depth of chromium depletion zones. New parameters have been developed to express the results of the potentiodynamic, potentiostatic, and electrochemical potentiokinetic reactivation (EPR) tests that reflect the contributions attributable to either coverag...

Mechanistic and fractographic aspects of stress corrosion cracking

Abstract: Basic aspects of stress-corrosion cracking (SCC) in metallic materials are outlined, followed by a summary of the numerous mechanisms that have been proposed for SCC. The characteristics of transgranular and intergranular SCC in model systems, e.g. pure metal and single-phase alloy single crystals and bi-crystals under testing conditions that facilitate discrimination between mechanisms, are then described. The applicability of the various proposed mechanisms, such as those based on dissolution, hydrogen embrittlement, film-induced cleavage, and adsorption, are discussed in detail for these systems. Mechanisms of SCC in complex commercial alloys are then considered in the light of these studies on model systems.

Effect of Homogenization and Aging Treatment on Mechanical Properties and Stress-Corrosion Cracking of 7050 Alloys

Abstract: The effect of homogenization and aging treatments on the strength and the stress-corrosion-cracking (SCC) resistance of the 7050 aluminum alloy has been investigated and compared with those of the same-series 7075 alloy. The recrystallized structure and the quench sensitivity are found to be significantly affected by the dispersoid distribution, depending on the homogenization conditions. The finest and densest dispersoid distribution, generated by the step-homogenization (Step-H) treatment, can effectively inhibit recrystallization to obtain the smallest fraction of recrystallized structure. Such a characteristic lowers considerably the quench sensitivity of the 7050 alloy, but it produces the reverse in the 7075 alloy. For the 7050 alloy, Step-H always exhibits the highest strength among all the aging conditions, and the proposed step-quench and aging (SQA) treatment is confirmed to achieve an optimum strength and coarsened and wide-spaced grain-boundary precipitates (GBP), which have been found to improve the resistance of the SCC by the slow-strain-rate test (SSRT). Therefore, the attainment of both optimum strength and SCC resistance is possible for the 7050 alloy via the Step-H and SQA treatment. However, such treatment is not applicable to the 7075 alloy because of its inborn high quench sensitivity.