Effects of Fe on the oxidation/internal nitridation behavior and tensile properties of Cr and oxide dispersion ductilized Cr

Brady, Michael P.; Sachenko, P.

doi:10.1016/j.scriptamat.2005.01.019

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…This time, Cr 2 N and WO 3 peaks were identified in addition to the Cr 2 O 3 peaks in the X-ray spectrum. Formation of Cr 2 N in Cr and Cr-Nb alloys oxidized in dry and moist air at 950-1,100°C was previously reported [14][15][16][17].…”

Section: Continuous Oxidation Of the Cr-10w Alloymentioning

confidence: 75%

“…Some type of surface modification or coating technique is needed in order to use these alloys in oxidizing environments at elevated temperatures. Nitridation of Cr and its alloys in air was studied by several researchers [14][15][16][17]. Recently, the effect of additions of Fe, La, and MgO to Cr was shown to be effective in reducing the extent of Cr 2 N formation [17].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al on High-Temperature Oxidation of Cr–W Alloys

Doğan

2008

Oxid Met

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The effect of Al on the high temperature oxidation behavior of Cr-10 wt.%W alloy was investigated using a cyclical oxidation test at 1,000°C in dry air. First, Al was added into the Cr-W alloy as an alloying element up to 8 weight percent. Although alloying with Al reduced the spalling, it did not eliminate it. Secondly, Al was applied to the surface using an aluminizing process. Forming an Al-Cr layer on the Cr-W alloy reduced oxidation rate significantly and eliminated spalling completely.

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Section: Continuous Oxidation Of the Cr-10w Alloymentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Effect of Al on High-Temperature Oxidation of Cr–W Alloys

Doğan

2008

Oxid Met

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“…It was demonstrated that nitridation still occurs with Cr-49 wt%Fe [22]. In this case, Cr 2 N does not form a continuous layer under the metal-oxide interface but rather forms dispersed precipitates in the Cr(Fe) solid solution.…”

Section: Discussionmentioning

confidence: 99%

On the Oxidation and Nitridation of Chromium at 1300 °C

et al. 2010

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Chromium can be a candidate of interest as a base component for refractory alloys for high temperature applications. Few data are available about oxidation kinetic of chromium in air for temperature as high as 1300°C. Moreover, rare papers take the nitridation of chromium into account in the description of the oxidation process or in the calculation of the kinetic constants. In the present study, global methods like thermogravimetry were linked to thickness measurements and microstructural characterisation to evaluate oxidation and nitridation contribution to weight gain. High stress levels were induced in the oxide layer during its formation. The kinetic constant associated to the nitridation, at this temperature, was one order of magnitude higher than the parabolic oxidation constant. Experiments demonstrated that the presence of nitrogen in the substrate is always a precursor to breakdown of the oxide layer and does not result from diffusion through the Cr 2 O 3 layer.

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“…Addition of oxide particles such as ThO 2 [16,17], MgO [11,8] and Y 2 O 3 [19,20] in chromium was shown to improve its room-temperature ductility [11], to retard subscale Cr 2 N formation [18] or to lower the DBTT [16]. Veigel [16] showed an oxide dispersion strengthening (ODS) effect at low temperature (150-200°C), but this beneficial effect unfortunately vanishes at high temperature (1093°C).…”

Section: Alloy Designmentioning

confidence: 99%