Evaluation of stainless steels for their resistance to intergranular corrosion

Korostelev, A. B.; Abramov, V. Ya.; Belous, Vladimir

doi:10.1016/s0022-3115(96)00277-2

Cited by 10 publications

(3 citation statements)

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“…5 was noted to have improved resistance to intergranular corrosion. Korostelev et al 121 gave another approach using the K parameter. The parameter K was defined as Cr eff -aC eff , where a5 thermodynamic coefficient, Cr eff 5effective chromium content (regarding molybdenum influence) and C eff 5effective carbon content (taking into account nickel and stabilising elements).…”

Section: Influence Of Chemical Compositionmentioning

confidence: 99%

Influence of metallurgical variables on sensitisation kinetics in austenitic stainless steels

Dayal¹,

Parvathavarthini²,

Raj³

2005

International Materials Reviews

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Austenitic stainless steels are the most favoured construction materials for various components required in chemical, petrochemical, fertiliser and nuclear industries. However, these steels are prone to sensitisation. In the sensitised condition, the steels are quite susceptible to intergranular corrosion and intergranular stress corrosion cracking in chloride and caustic environments resulting in the premature failure of the fabricated components during precommissioning and service periods. The topic of sensitisation has been of interest in studies worldwide. The studies included mechanism of sensitisation, test methods, data generation, and influence of several variables and protection methods. This article covers a review of important contributions to this topic with special emphasis on the influence of metallurgical variables. The present state of understanding is discussed in the following areas: mechanisms, test methods, sensitisation diagrams, influence of chemical composition, cold work and grain size, low temperature sensitisation, modelling and laser surface treatment. The need for further investigation in certain areas is highlighted.

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Section: Influence Of Chemical Compositionmentioning

confidence: 99%

Influence of metallurgical variables on sensitisation kinetics in austenitic stainless steels

Dayal¹,

Parvathavarthini²,

Raj³

2005

International Materials Reviews

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“…This possibility of this form of corrosion must be taken into account when applying post-deformation heat treatment to enhance the ductility of nanometals [6][7][8][9], since the high strength is not accompanied by high ductility in the case of nanometals. Several methods have been proposed to avoid sensitising stainless steel, and thereby eliminating the risk of intergranular corrosion, including a reduction of the carbon content, the addition of elements like titanium or niobium and creating specially engineered grain boundaries [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Intergranular corrosion resistance of nanostructured austenitic stainless steel

2013

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Nanostructured metals and alloys possess very high strength but exhibit limited plasticity. Enhancement of the strength/ductility balance is of prime importance to achieve wide industrial applications. However, postdeformation heat treatment, which is usually used to improve plasticity, can lead to a decrease in other properties. In the case of austenitic stainless steels, heat treatment in the range from 480 to 815°C can increase their susceptibility to intergranular corrosion. The aim of the work reported in this paper was to determine if nanostructured austenitic stainless steel is susceptible to intergranular corrosion if heat treated for 1 h at 700°C. Samples of 316LVM austenitic stainless steel were hydrostatically extruded, in a multi-step process with the total true strain of 1.84 to produce a uniform microstructure consisting of nanotwins. These nanotwins averaged 21 nm in width and 197 nm in length. Subsequent annealing at 700°C produced a recrystallised structure of 68-nm-diameter nanograins. The heat treatment improved the ductility from 7.8 to 9.2 % while maintaining the ultimate tensile strength at the high level of 1485 MPa. Corrosion tests were performed in an aqueous solution consisting of 450 ml concentrated HNO 3 and 9 g NaF/dm 3 (according to ASTM A262-77a). The evaluation of the corrosion resistance was based on transmission and scanning electron microscopic observation of the microstructure and chemical analyses. The results revealed that both the as-received and HE-processed samples are slightly susceptible to the intergranular corrosion after annealing at 700°C for 1 h.

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“…Οι Korostelev κ.αλ. [122] εκτίμησαν τη μέγιστη περιεκτικότητα χρωμίου και άνθρακα στους ωστενιτικούς χάλυβες προς αποφυγή της διάβρωσης, λόγω σχηματισμού των καρβιδίων Cr 23 C 6 . Τα καρβίδια αυτού του τύπου οδηγούν σε κατανάλωση ποσοστού χρωμίου στα όρια των κόκκων και έλλειψη χρωμίου από την υπόλοιπη μήτρα, καθιστώντας περισσότερο ευπαθές το κράμα.…”

Section: αρθρογραφική αναδρομή για τη διάβρωση ανοξείδωτων χαλύβωνunclassified

Κραματωμένες Επικαλύψεις Με Τη Τεχνική Μεταφερόμενου Τόξου Πλάσματος

Darabara¹,

Δαραμπάρα²

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Περίληψη στα ελληνικά i Περίληψη στα αγγλικά (Summary) vΚεφάλαιο 1 o : Το άζωτο στους χάλυβες 1.1. Εισαγωγή 1.2. Διαλυτότητα αζώτου στο σίδηρο και το χάλυβα 1.2.1. Η επίδραση της μερικής πίεσης του αζώτου στη διαλυτότητα του στον τηγμένο σίδηρο σε συνθήκες ισορροπίας 1.2.2. Η επίδραση της θερμοκρασίας στη διαλυτότητα του αζώτου στο σίδηρο σε συνθήκες ισορροπίας 1.2.3. Η επίδραση των κραματικών στοιχείων στη διαλυτότητα του αζώτου 7.4.3. Σκληρότητα 7.4.4. Διάβρωση 7.4.4.1. Κυκλική Πολωτική Διάβρωση σε υδατικό διάλυμα 3,5%κ.β. NaCl 7.4.4.2. Κυκλική Πολωτική Διάβρωση σε υδατικό διάλυμα 1Ν H 2 SO 4 7.4.4.3. Χημική Διάβρωση σε υδατικό διάλυμα 6%κ

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Evaluation of stainless steels for their resistance to intergranular corrosion

Cited by 10 publications

References 0 publications

Influence of metallurgical variables on sensitisation kinetics in austenitic stainless steels

Influence of metallurgical variables on sensitisation kinetics in austenitic stainless steels

Intergranular corrosion resistance of nanostructured austenitic stainless steel

Κραματωμένες Επικαλύψεις Με Τη Τεχνική Μεταφερόμενου Τόξου Πλάσματος

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