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      Study on nitrogen in martensitic stainless steels Translated title: Studie über Stickstoff in martensitischen rostfreien Stählen

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          Abstract

          Pressure metallurgy is a means of increasing the nitrogen content and thereby the resistance of stainless martensitic steels to pitting corrosion. The present study on their constitution and heat treatment reveals that even at normal pressure more nitrogen is dissolved in the melt if the carbon content increases, because the fraction of ferrite is reduced during solidification. Nitrogen is dissolved more readily during austenitisation than carbon which lowers the C/N ratio at hardening temperature and thus is likely to improve the corrosion resistance of martensite after quenching. As the stability of retained austenite is increased by nitrogen a strain induced transformation by ausforming is discussed.

          Kurzfassung

          Durch Druckmetallurgie kann der Stickstoffgehalt und damit die Beständigkeit nichtrostender martensitischer Stähle gegen Lochkorrosion erhöht werden. Die vorliegende Studie zu Konstitution und Wärmebehandlung dieser Stähle zeigt, dass auch bei Normaldruck mehr Stickstoff in der Schmelze gelöst wird, wenn der Kohlenstoffgehalt steigt, weil der Anteil an Ferrit während der Erstarrung abnimmt. Stickstoff geht beim Austentisieren eher in Lösung als Kohlenstoff, was das C/N-Verhältnis bei Härtetemperatur senkt und die Korrosionsbeständigkeit des Martensits nach dem Abschrecken verbessern sollte. Da Stickstoff die Restaustenitstabilität steigert, wird eine verformungsinduzierte Umwandlung durch Austenitformhärten diskutiert.

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          Most cited references 34

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          Empirical formulae for the calculation of some transformation temperatures

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            High Nitrogen Steels

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              An examination of the validity of existing empirical formulae for the calculation of ms temperature

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                Author and article information

                Journal
                htme
                HTM Journal of Heat Treatment and Materials
                Carl Hanser Verlag
                1867-2493
                2194-1831
                2011
                : 66
                : 3
                : 150-164
                Affiliations
                1 Ruhr-Universität Bochum, krasokha@ 123456wtech.rub.de
                2 Ruhr-Universität Bochum
                Article
                HT110099
                10.3139/105.110099
                © 2011, Carl Hanser Verlag, München
                Page count
                References: 54, Pages: 15
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/htme
                Categories
                Fachbeiträge/Technical Contributions

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