Room-Temperature Ductile Chromium

Johansen, H. A.; Asai, G.

doi:10.1149/1.2781161

J. Electrochem. Soc.

1954

DOI: 10.1149/1.2781161

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Room-Temperature Ductile Chromium

H. A. Johansen¹,

G. Asai²

Abstract: Development of the effort to find room-temperature ductile chromium is reviewed. Preparation and some mechanical properties of ductile chromium are described, as are techniques of making brittle chromium ductile by removal of surface layers. Reasons for the ductility, or lack of it, are advanced on the basis of experiments showing the effect of certain impurities, mechanical working, and heat treatment. No clear explanation for the surface phenomenon was obtained. Possible future uses of ductile chromium arc d… Show more

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Cited by 13 publications

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The Influence of Mo Content and Annealing on the Oxidation Behavior of Arc‐Melted Cr–xMo–8Si Alloys

Koliotassis,

White,

Galetz

2024

Adv Eng Mater

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The influence of Mo (10‐40at.%) additions to Cr‐8at.%Si was systematically studied by producing arc melted alloys and analyzing the as‐cast and annealed microstructures as well as the oxidation resistances. The majority of the alloys contained a solid solution A2 matrix with the intermetallic A15 = (Cr,Mo)3Si phase. The oxidation resistance was tested by thermogravimetric analysis (TGA) at 1200 °C in air for 50 and 100 h. Samples were characterized by XRD, SEM and EPMA (WDS). The studied Cr‐xMo‐8Si alloy series showed a beneficial effect of Mo on the corrosion behavior of the annealed arc melted alloys exposed at 1200 °C in air. An increased amount of A15 led to the formation of a continuous SiO2 scale beneath the Cr2O3 layer during high temperature exposure. The internal SiO2 layer inhibited further internal oxidation of the A15 phase. Prior annealing also influenced the oxidation behavior of the alloys. Higher annealing temperatures, resulted in an overall reduced fraction of the A15 phase, as well as coarsening, but also showed a more uniform size and distribution of the precipitates, which seems to benefit the formation of a protective duplex oxide scale. Cr‐25Mo‐8at.%Si annealed at 1350 °C for 100 h, showed the most promising oxidation behavior after exposure in air at 1200 °C for 100 h. For all of the investigated Mo contents, no nitridation was observed when compared to the Cr‐8Si reference composition. The oxide scale adhesion also was improved. For Mo >25 at.% no spallation was observed. Evaluation of the TGA data showed it follows the paralinear law, with both the growth rate, kp, and volatilization rate, kv, of Cr2O3 being reduced by adding 10‐25 at.% Mo. A binary Cr/Mo‐Si phase diagram was generated for the studied alloy series in order to determine accurate annealing conditions and estimate the stability range of the metastable σ phase.This article is protected by copyright. All rights reserved.

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The Influence of Mo Content and Annealing on the Oxidation Behavior of Arc‐Melted Cr–xMo–8Si Alloys

Koliotassis,

White,

Galetz

2024

Adv Eng Mater

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Ductile-brittle transition of thoriated chromium

Wilcox

Veigel²,

Clauer

1972

Metall Trans

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Bendability of aluminiumand steel-clad chromium plates

Yoshida

Okada

Itoh

et al. 1998

Metals and Materials

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Room-Temperature Ductile Chromium

Cited by 13 publications

References 4 publications

The Influence of Mo Content and Annealing on the Oxidation Behavior of Arc‐Melted Cr–xMo–8Si Alloys

The Influence of Mo Content and Annealing on the Oxidation Behavior of Arc‐Melted Cr–xMo–8Si Alloys

Ductile-brittle transition of thoriated chromium

Bendability of aluminiumand steel-clad chromium plates

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