Corrosion fatigue of a manganese–nitrogen stabilized austenitic stainless steel / R. Sonnleitner in Materials and corrosion, Vol. 61 N° 2 (Fevrier 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 2 (Fevrier 2010) . - pp. 97–104 Titre : Corrosion fatigue of a manganese–nitrogen stabilized austenitic stainless steel Type de document : texte imprimé Auteurs : R. Sonnleitner, Auteur ; G. Mori, Auteur ; M. Panzenböck, Auteur Année de publication : 2010 Article en page(s) : pp. 97–104 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Austenite  corrosion fatigue  fracture surface  high nitrogen steel  stainless steel Résumé : Austenitic chromium–manganese–nitrogen stabilized stainless steels have been developed to replace chromium–nickel–nitrogen stainless steels in certain applications. In comparison, chromium–manganese–nitrogen steels have improved mechanical properties and acceptable corrosion resistance in hot, high chloride containing media. In this paper, corrosion fatigue investigations of a solution annealed and for practice more relevant 14% cold worked high alloyed chromium–manganese–nitrogen steel have been done. Inert glycerine was used as reference media and 62% calcium chloride solution as corrosive media, both aerated at a temperature of 120 °C. The stress ratio between upper and lower stress levels was 0.05 (tension–tension loading) to avoid the destruction of the fracture surfaces. As testing frequency for the dynamic experiments, 20 Hz was chosen considering possible application areas. Maximum stress versus number of cycles curves were recorded and representative specimens were investigated in a scanning electron microscope. In addition, electrochemical tests, exposure tests and constant load tests were done. This paper shows results on the corrosion fatigue of a manganese–nitrogen stabilized austenitic steel in a hot high chloride containing salt solution and helps to get a better understanding of occurring failure mechanisms. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905264/abstract [article] Corrosion fatigue of a manganese–nitrogen stabilized austenitic stainless steel [texte imprimé] / R. Sonnleitner, Auteur ; G. Mori, Auteur ; M. Panzenböck, Auteur . - 2010 . - pp. 97–104. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 2 (Fevrier 2010) . - pp. 97–104 Mots-clés : Austenite  corrosion fatigue  fracture surface  high nitrogen steel  stainless steel Résumé : Austenitic chromium–manganese–nitrogen stabilized stainless steels have been developed to replace chromium–nickel–nitrogen stainless steels in certain applications. In comparison, chromium–manganese–nitrogen steels have improved mechanical properties and acceptable corrosion resistance in hot, high chloride containing media. In this paper, corrosion fatigue investigations of a solution annealed and for practice more relevant 14% cold worked high alloyed chromium–manganese–nitrogen steel have been done. Inert glycerine was used as reference media and 62% calcium chloride solution as corrosive media, both aerated at a temperature of 120 °C. The stress ratio between upper and lower stress levels was 0.05 (tension–tension loading) to avoid the destruction of the fracture surfaces. As testing frequency for the dynamic experiments, 20 Hz was chosen considering possible application areas. Maximum stress versus number of cycles curves were recorded and representative specimens were investigated in a scanning electron microscope. In addition, electrochemical tests, exposure tests and constant load tests were done. This paper shows results on the corrosion fatigue of a manganese–nitrogen stabilized austenitic steel in a hot high chloride containing salt solution and helps to get a better understanding of occurring failure mechanisms. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905264/abstract

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On the applicability of high strength self-tapping aluminium bolts in magnesium nut materials for automotive applications / G. Gerstmayr in Materials and corrosion, Vol. 61 N° 5 (Mai 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 5 (Mai 2010) . - pp. 379–387 Titre : On the applicability of high strength self-tapping aluminium bolts in magnesium nut materials for automotive applications Type de document : texte imprimé Auteurs : G. Gerstmayr, Auteur ; G. Mori, Auteur ; H. Leitner, Auteur Année de publication : 2010 Article en page(s) : pp. 379–387 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : galvanic corrosion  high strength aluminium alloys  stress corrosion cracking Résumé : High strength aluminium bolts made of AW 6056 T6, AW 7075 T6 and T79 have been investigated regarding the applicability in magnesium nut materials for automotive applications. With respect to galvanic corrosion all combinations of aluminium bolts with magnesium parts show superior corrosion properties when compared to galvanised steel bolts connected to magnesium. With respect to stress corrosion cracking (SCC) no aluminium bolt in contact with magnesium failed due to SCC. This is because of cathodic protection of aluminium alloy through magnesium. Even peak-tempered highest strengthened T6 7xxx aluminium bolts can be used for automotive applications when compressive residual stresses are present in the thread root of the bolts. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905409/abstract [article] On the applicability of high strength self-tapping aluminium bolts in magnesium nut materials for automotive applications [texte imprimé] / G. Gerstmayr, Auteur ; G. Mori, Auteur ; H. Leitner, Auteur . - 2010 . - pp. 379–387. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 5 (Mai 2010) . - pp. 379–387 Mots-clés : galvanic corrosion  high strength aluminium alloys  stress corrosion cracking Résumé : High strength aluminium bolts made of AW 6056 T6, AW 7075 T6 and T79 have been investigated regarding the applicability in magnesium nut materials for automotive applications. With respect to galvanic corrosion all combinations of aluminium bolts with magnesium parts show superior corrosion properties when compared to galvanised steel bolts connected to magnesium. With respect to stress corrosion cracking (SCC) no aluminium bolt in contact with magnesium failed due to SCC. This is because of cathodic protection of aluminium alloy through magnesium. Even peak-tempered highest strengthened T6 7xxx aluminium bolts can be used for automotive applications when compressive residual stresses are present in the thread root of the bolts. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905409/abstract

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Study of sensitization and different heating cycles on stainless steels used for automotive exhaust components / M. Yasir in Materials and corrosion, Vol. 63 N° 9 (Septembre 2012)  

Public ISBD [article]  inMaterials and corrosion > Vol. 63 N° 9 (Septembre 2012) . - pp. 763–776 Titre : Study of sensitization and different heating cycles on stainless steels used for automotive exhaust components Type de document : texte imprimé Auteurs : M. Yasir, Auteur ; G. Mori, Auteur ; H. Wieser, Auteur Année de publication : 2013 Article en page(s) : pp. 763–776 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : High temperature corrosion  pitting sensitization  stainless steels Résumé : In order to achieve a reasonable lifetime of automotive exhaust components, a large number of high alloyed ferritic and austenitic stainless steels are used nowadays. It is a common concept that the lifetime of a component is directly related to the performance of steel against corrosion. The components are divided into different sections depending on their service temperatures. High temperature oxidation resistance is one of the properties which are required in different sections. The effect of material sensitization on corrosion resistance of stainless steels is well understood from the literature. Besides, sensitization materials in exhaust systems have to withstand different cyclic heating and cooling phases. The objective of this study was to develop a basic understanding that can determine the influence of different temperature treatments on stainless steels. A fundamental understanding on the interaction of sensitization and cyclic heat impacts are presented in the paper. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106255/abstract [article] Study of sensitization and different heating cycles on stainless steels used for automotive exhaust components [texte imprimé] / M. Yasir, Auteur ; G. Mori, Auteur ; H. Wieser, Auteur . - 2013 . - pp. 763–776. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 9 (Septembre 2012) . - pp. 763–776 Mots-clés : High temperature corrosion  pitting sensitization  stainless steels Résumé : In order to achieve a reasonable lifetime of automotive exhaust components, a large number of high alloyed ferritic and austenitic stainless steels are used nowadays. It is a common concept that the lifetime of a component is directly related to the performance of steel against corrosion. The components are divided into different sections depending on their service temperatures. High temperature oxidation resistance is one of the properties which are required in different sections. The effect of material sensitization on corrosion resistance of stainless steels is well understood from the literature. Besides, sensitization materials in exhaust systems have to withstand different cyclic heating and cooling phases. The objective of this study was to develop a basic understanding that can determine the influence of different temperature treatments on stainless steels. A fundamental understanding on the interaction of sensitization and cyclic heat impacts are presented in the paper. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106255/abstract

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