scholarly journals Fatigue Behavior of Metastable Austenitic Stainless Steels in LCF, HCF and VHCF Regimes at Ambient and Elevated Temperatures

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 704 ◽  
Author(s):  
Smaga ◽  
Boemke ◽  
Daniel ◽  
Skorupski ◽  
Sorich ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
Deformation Behavior ◽  
High Cycle Fatigue ◽  
Elevated Temperatures ◽  
Austenitic Stainless Steels ◽  
Cycle Fatigue ◽  
Metastable Austenitic Stainless Steel ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Corrosion resistance has been the main scope of the development in high-alloyed low carbon austenitic stainless steels. However, the chemical composition influences not only the passivity but also significantly affects their metastability and, consequently, the transformation as well as the cyclic deformation behavior. In technical applications, the austenitic stainless steels undergo fatigue in low cycle fatigue (LCF), high cycle fatigue (HCF), and very high cycle fatigue (VHCF) regime at room and elevated temperatures. In this context, the paper focuses on fatigue and transformation behavior at ambient temperature and 300 °C of two batches of metastable austenitic stainless steel AISI 347 in the whole fatigue regime from LCF to VHCF. Fatigue tests were performed on two types of testing machines: (i) servohydraulic and (ii) ultrasonic with frequencies: at (i) 0.01 Hz (LCF), 5 and 20 Hz (HCF) and 980 Hz (VHCF); and at (ii) with 20 kHz (VHCF). The results show the significant influence of chemical composition and temperature of deformation induced ´-martensite formation and cyclic deformation behavior. Furthermore, a “true” fatigue limit of investigated metastable austenitic stainless steel AISI 347 was identified including the VHCF regime at ambient temperature and elevated temperatures.

Mechanical and Microstrutural Characterization of Weldments of Ferritic Stainless Steel AISI 444 Using Austenitic Stainless Steels Filler Metals

2012 ◽  
Vol 9 (2) ◽  
pp. 103436
Author(s):  
Pedro Duarte Antunes ◽  
Edmilson Otoni Corre^a ◽  
Nancy Delducca Barbedo ◽  
Paola de Oliveira Souza ◽  
José Luiz Gonçalves ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Steel Aisi ◽  
Filler Metals ◽  
Stainless Steel Aisi

Quantitative Analysis of the Sensitization of an Austenitic Stainless Steel Aged between 600 and 900°C through Electrochemical and Microstructural Measurements

2020 ◽  
Vol 1012 ◽  
pp. 430-435
Author(s):  
Ramaiany Carneiro Mesquita ◽  
Ariele Rebeca Martins Ribeiro ◽  
Cintia Leite Gonçalves ◽  
Diogo Marcelo Lima Ribeiro ◽  
Sarah Caroline Gomes Caldas
Keyword(s):  
Stainless Steel ◽  
Quantitative Analysis ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Microstructural Analysis ◽  
Austenitic Stainless Steels ◽  
Aisi 304 ◽  
Temperature Range ◽  
Steel Aisi ◽  
Stainless Steel Aisi

Is the concern with latent phenomenon of sensitization, as it exposes austenitic stainless steels to one of the most severe types of corrosion, intergranular, caused by chrome impoverishment in some regions after the material has been treated thermally in a temperature range between 450°C and 850°C. The aim of this study is to identify the conditions under which the stainless steel AISI 304 austenitic will sensitize, microstructural analysis and reactivation potentiodynamics technique by Double cycle method (DL-EPR). In steel samples were subjected to different ranges of time and temperature. The behavior of the degree of sentiment reveals that the rainfall happens so intense under the conditions under study with the exception of 900oC - 1, 2, and 6, which was observed and proven both by microstructural analysis and the DL-EPR.

Fatigue of Stainless Steel Components: Toward Codified Rules Improvements

2013 ◽  
Author(s):  
Claude Faidy
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
Environmental Effects ◽  
Stainless Steels ◽  
High Cycle Fatigue ◽  
Fatigue Curve ◽  
Fatigue Tests ◽  
Correction Factors ◽  
Cycle Fatigue ◽  
The Past

During the past 30 years many fatigue tests and fatigue analysis improvements have been developed in France in order to improve Codified Fatigue Rules of French Nuclear Codes: RCC-M, RSE-M and RCC-MRx. This paper will present comments and proposals for development of these rules associated to Gaps and Needs in order to finalize and justify the AFCEN Codes new rules. Recently 3 new international R&D results confirm possible un-conservative fatigue material data: - High cycle fatigue in air for stainless steel, - Environmental effects on fatigue S-N curve for all materials, and in particular stainless steels, - Fatigue Crack Growth law under PWR environment for stainless steel. In front of these new results, AFCEN is working on a 1st set of rules based on existing knowledge: - Air fatigue curve: mean and design - PWR Environmental effects with detrimental correction factors A periodic up-dating of AFCEN proposed rules will be done using French and International R&D programs with a particular attention on harmonization with other Code rules developed in USA, Japan and Germany, in particular.

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