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Proceedings of ABM Annual Congress

ISSN 2594-5327

65º Congresso ABM — vol. 65, num.65 (2010)

Title

EFFECTS OF Si AND Nb ON OXIDATION BEHAVIOR IN HIGH PURITY FERRITIC STAINLESS STEELS

EFFECTS OF Si AND Nb ON OXIDATION BEHAVIOR IN HIGH PURITY FERRITIC STAINLESS STEELS

Authorship

Kato, Yasushi; Ito, Masatoshi; Furukimi, Osamu

Kato, Yasushi
Kato, Yasushi

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Ito, Masatoshi
Ito, Masatoshi

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Furukimi, Osamu
Furukimi, Osamu

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DOI

10.5151/2594-5327-16865

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Abstract

The effects of Si and Nb on the oxidation behavior at 1073 K in high purity 17Cr steels were investigated in conjunction with the Laves phase. In the early stage of oxidation, mass gains increased not only slightly with Nb addition but also further with the addition of Si and Nb, and precipitation of the Laves phase occurred for a short time with Nb addition and was promoted with Si addition. The increase in mass gain in the early stage of oxidation was seemingly caused by the oxidation of the Laves phase near the surface of steel. The parabolic growth rate constant became small for long-term oxidation with Nb addition in spite of Si addition. The reason for this appeared to be that the Laves phase, which had already precipitated at grain boundaries, suppressed the grain boundary diffusion of cations in steel.

 

The effects of Si and Nb on the oxidation behavior at 1073 K in high purity 17Cr steels were investigated in conjunction with the Laves phase. In the early stage of oxidation, mass gains increased not only slightly with Nb addition but also further with the addition of Si and Nb, and precipitation of the Laves phase occurred for a short time with Nb addition and was promoted with Si addition. The increase in mass gain in the early stage of oxidation was seemingly caused by the oxidation of the Laves phase near the surface of steel. The parabolic growth rate constant became small for long-term oxidation with Nb addition in spite of Si addition. The reason for this appeared to be that the Laves phase, which had already precipitated at grain boundaries, suppressed the grain boundary diffusion of cations in steel.

Keywords

Stainless steels; Ferritic steels; Oxidation; Laves phases.

Stainless steels; Ferritic steels; Oxidation; Laves phases.

How to refer

Kato, Yasushi; Ito, Masatoshi; Furukimi, Osamu. EFFECTS OF Si AND Nb ON OXIDATION BEHAVIOR IN HIGH PURITY FERRITIC STAINLESS STEELS , p. 4240-4247. In: 65º Congresso ABM, Rio de Janeiro, 2010.
ISSN: 2594-5327 , DOI 10.5151/2594-5327-16865