Effects of Various Alloying Additions on the Resistance to Oxidation at Elevated Temperatures of 18% Chromium Austenitic Steel

Truman, J. E.; Pirt, K. R.

doi:10.1179/000705978798276393

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British Corrosion Journal

1978

DOI: 10.1179/000705978798276393

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Effects of Various Alloying Additions on the Resistance to Oxidation at Elevated Temperatures of 18% Chromium Austenitic Steel

J. E. Truman¹,

K. R. Pirt²

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The effect of niobium on the oxidation behaviour of fully Austenitic Fe‐15% Cr‐15%Ni stainless steels

Ramanathan

Pohl

Padilha

1995

Materials & Corrosion

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The influence of niobium content (0.5-2.0 wt.o/) on the oxidation behaviour of Fe-15% Cr-lS% Ni austenitic stainless steels has been studied by cyclic oxidation tests in air at different temperatures in the range 800-1200 "C. The isothermal oxidation rate, the scaling index and the cumulative oxide loss decreased with increasing niobium content. X-ray diffraction and fluorescence analysis of detached oxide scales revealed that the niobium in the alloy matrix facilitated the formation of chromium rich (Fe,Cr)203 and niobium containing mixed oxide near the metaumetal oxide boundary, which decreased further oxidation. SEM/EDX investigations revealed that the external oxide changed from being predominantly iron rich iron-chromium oxide to being chromium rich iron-chromium oxide.Der EinfluR des Niobgehaltes (0,s-2,0 Gew.-%) auf das Oxidationsverhalten von austenitischen rostfreien Fe-15% Cr-lSYONi-Stahlen wurde untersucht mit Hilfe von isothermen und zyklischen Oxidationstests in Luft bei unterschiedlichen Temperaturen zwischen 800 und 1200 "C. Die isotherme Oxidationsrate, die Verzunderungsrate und der Gesarntverlust an Deckschichtoxid verringerten sich mit ansteigendem Niobgehalt . Rontgendiagramme und eine Fluoreszenzanalyse der abgelosten Oxidschichten zeigten, daR das Niob in der Legierungsmatrix die Bildung eines chromreichen (Fe,Cr)203 und eines niobhaltigen Mischoxids nahe der MIMO-Grenze ermoglichte, was die weitere Oxidation verlangsamte. REMund EDX-Analysen zeigten, dalj die auBere Oxidschicht von iiberwiegend eisenreichem Eisenchromoxid zu chromreichem Eisenchromoxid wechselte.

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The effect of niobium on the oxidation behaviour of fully Austenitic Fe‐15% Cr‐15%Ni stainless steels

Ramanathan

Pohl

Padilha

1995

Materials & Corrosion

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Oxidation of high-aluminum austenitic stainless steels

1988

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High temperature corrosion of 12%Cr-Al cast steels

1984

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Effects of Various Alloying Additions on the Resistance to Oxidation at Elevated Temperatures of 18% Chromium Austenitic Steel

Cited by 4 publications

References 4 publications

The effect of niobium on the oxidation behaviour of fully Austenitic Fe‐15% Cr‐15%Ni stainless steels

The effect of niobium on the oxidation behaviour of fully Austenitic Fe‐15% Cr‐15%Ni stainless steels

Oxidation of high-aluminum austenitic stainless steels

High temperature corrosion of 12%Cr-Al cast steels

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