Fatigue damage evaluation of stainless AISI 347 steel by advanced microstructure-sensitive NDT analysis

Donnerbauer, Kai; Acosta, Ruth; Boller, Christian; Bill, Tobias; Starke, Peter; Heckmann, Klaus; Sievers, J.; Schopf, Tim; Walther, Frank

doi:10.1016/j.prostr.2022.12.093

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…In order to be able to evaluate these properties, the material response due to the fatigue loading is measured by using different NDT-related techniques. For instance IR-thermography or electrical resistance measurements, are very sensitive tools to measure and evaluate changes in microstructure during the fatigue process, 26,[44][45][46][47][48][49][50][51][52][53][54] whereby the focus in this article is on the use of temperature data. Additionally, values from related change in electrical resistance and plastic strain amplitude are included into the consideration.…”

Section: Midaclife Incrmentioning

confidence: 99%

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

Weber,

Maul,

Juner

et al. 2024

Fatigue Fract Eng Mat Struct

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Materials used in nuclear power plants are exposed to cyclic loading, which is why the understanding of fatigue behaviour is of great importance. Because of high time investments and resulting increased costs, Lifetime Prediction Methods, which significantly reduce the amount of specimen, have already been developed. Within this paper, the Lifetime Prediction Method MiDAcLifeincr is presented, which enables a determination of a trend S‐N curve in the High‐Cycle‐Fatigue‐regime based on only one fatigue test and the combination of conventional fatigue testing with NDT‐related measurement techniques. The process‐orientated monitoring of the cyclic deformation behaviour provides the basis for the time‐ and cost‐effective provision of fatigue data. Compared with previous methods, the consideration of variable loading is an essential aspect of the research application. The test material is a 20MnMoNi5‐5 steel, the results of which are extended to include other steels for validation reasons.

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Section: Midaclife Incrmentioning

confidence: 99%

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

Weber,

Maul,

Juner

et al. 2024

Fatigue Fract Eng Mat Struct

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Fatigue life evaluation of metastable austenitic stainless steel AISI 347 based on nondestructive testing methods for different environmental conditions

Donnerbauer,

Bill,

Starke

et al. 2024

International Journal of Fatigue

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Investigations of Metallurgical Differences in AISI 347 and Their Influence on Deformation and Transformation Behaviour and Resulting Fatigue Life

Veile,

Regitz,

Smaga

et al. 2024

Materials

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Due to variations in chemical composition and production processes, homonymous austenitic stainless steels can differ significantly regarding their initial microstructure, metastability, and thus, their fatigue behavior. Microstructural investigations and fatigue tests have been performed in order to evaluate this aspect. Three different batches and production forms of nominally one type of steel AISI 347 were investigated under monotonic tensile tests and cyclic loading under total strain and stress control in low and high cycle fatigue regimes, respectively. The deformation induced α’-martensite formation was investigated globally by means of in situ magnetic measurements and locally using optical light microscopy of color etching of micrographs. The investigation showed that the chemical composition and the different production processes influence the material behavior. In fatigue tests, a higher metastability and thus a higher level of deformation induced α’-martensite pronounced cyclic hardening, resulting in significantly greater endurable stresses in total strain-controlled tests and an increase in fatigue life in stress-controlled tests. For applications of non-destructive-testing, detailed knowledge of a component’s metastability is required. In less metastable batches and for lower stress levels, α’-martensite primarily formed at the plasticization zone of a crack. Furthermore, the formation and nucleation points of α’-martensite were highly dependent on grain size and the presence of δ-ferrite. This study provides valuable insights into the different material behavior of three different batches with the same designation, i.e., AISI 347, due to different manufacturing processes and differences in the chemical composition, metastability, and microstructure.

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Fatigue damage evaluation of stainless AISI 347 steel by advanced microstructure-sensitive NDT analysis

Cited by 3 publications

References 4 publications

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

Fatigue life evaluation of metastable austenitic stainless steel AISI 347 based on nondestructive testing methods for different environmental conditions

Investigations of Metallurgical Differences in AISI 347 and Their Influence on Deformation and Transformation Behaviour and Resulting Fatigue Life

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