Characterization of the Fatigue Behavior of Mechanical and Thermal Aged Austenitic Power Plant Steel AISI 347

Maci, F.; Jamrozy, Michael; Acosta, Ruth; Starke, Peter; Boller, Christian; Heckmann, Klaus; Sievers, J.; Schopf, Tim; Walther, Frank

doi:10.1007/978-3-030-13980-3_9

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The relatively significant changes at the step transition can probably be explained by pre-existing micro cracks in the material leading to anodic metal dissolution, whereupon the EOCP is shifted to a cathodic direction. The EOCP signal stabilizes after macro crack initiation until it transitions to the previously mentioned stable and then to the unstable crack propagation at εa,t,cor = 0.55 × 10 −2 [26].…”

Section: Comparison Initial Condition and Agedmentioning

confidence: 85%

A Short-Time Approach for Fatigue Life Evaluation of AISI 347 Steel for Nuclear Power Energy Applications

et al. 2021

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AISI 347 austenitic steel is, as an example, used in nuclear energy piping systems. Piping filled with superheated steam or cooled water is particularly exposed to high stresses, whereupon local material properties in the pipes can change significantly, especially in the case of additional corrosive influences, leading to aging of the material. In the absence of appropriate information, such local material property variations are currently covered rather blanketly by safety factors set during the design of those components. An increase in qualified information could improve the assessment of the condition of such aged components. As part of the collaborative project “Microstructure-based assessment of the maximum service life of core materials and components subjected to corrosion and fatigue (MiBaLeB)”, the short-time procedure, StrainLife, was developed and validated by several fatigue tests. With this procedure, a complete S–N curve of a material can be determined on the basis of three fatigue tests only, which reduces the effort compared to a conventional approach significantly and is thus ideal for assessing the condition of aged material, where the material is often rare, and a cost-effective answer is often very needed. The procedure described is not just limited to traditional parameters, such as stress and strain, considered in destructive testing but rather extends into parameters derived from non-destructive testing, which may allow further insight into what may be happening within a material’s microstructure. To evaluate the non-destructive quantities measured within the StrainLife procedure and to correlate them with the aging process in a material, several fatigue tests were performed on unnotched and notched specimens under cyclic loading at room and elevated temperatures, as well as under various media conditions, such as distilled water and reactor pressure vessel boiling water (BWR) conditions.

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Section: Comparison Initial Condition and Agedmentioning

confidence: 85%

A Short-Time Approach for Fatigue Life Evaluation of AISI 347 Steel for Nuclear Power Energy Applications

et al. 2021

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Numerical simulation on magnetic–mechanical behaviors of 304 austenite stainless steel

Liu

2020

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Non-destructive testing derived parameters for microstructure-based residual service life assessment of aging metallic materials in nuclear engineering

et al. 2019

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Metallic components in nuclear engineering are exposed to extensive loads such as pressurization and temperature changes which can affect the properties of the material significantly depending on the load spectrum applied. In view of developing a procedure to evaluate the residual service life of metallic components in nuclear power plants aged during service, metastable austenitic steel AISI 347 (German designation: X6CrNiNb18−10) has been considered as an example. To this purpose, total strain-controlled fatigue tests were carried out under different environmental conditions and monitored by continuously measuring thermometric, resistometric, electromagnetic and electrochemical parameters. These parameters provide an information gain in terms of material characterization when compared to conventional strain measurements. Based on these parameters, the short time evaluation procedure StrainLife has been developed, which allows the determination of local S-N curves with a significantly reduced effort as compared with traditional procedures. This method has been implemented into the structural simulation program PROST for the integrity assessment of the components while considering local fatigue properties. This very effective method allows for the determination of local fatigue properties including the strain-specific local scatter of the metallic microstructure properties of the material which has not been possible by traditional means.

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Characterization of the Fatigue Behavior of Mechanical and Thermal Aged Austenitic Power Plant Steel AISI 347

Cited by 3 publications

References 7 publications

A Short-Time Approach for Fatigue Life Evaluation of AISI 347 Steel for Nuclear Power Energy Applications

A Short-Time Approach for Fatigue Life Evaluation of AISI 347 Steel for Nuclear Power Energy Applications

Numerical simulation on magnetic–mechanical behaviors of 304 austenite stainless steel

Non-destructive testing derived parameters for microstructure-based residual service life assessment of aging metallic materials in nuclear engineering

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