An evaluation of the properties of Cr3Si alloyed with Mo

Raj, S. V.

doi:10.1016/0921-5093(95)09767-8

Cited by 64 publications

(24 citation statements)

References 11 publications

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“…7) In fact, the formation of ¡-cristobalite together with Cr 2 O 3 has been confirmed in CrMoSi alloys for oxidation in the temperature range of 10001200°C. 22) It is therefore suggested that SiO 2 also forms on the surfaces of the alloys, which contributes increased oxidation resistance. Figure 13 shows SEM micrographs of the surfaces and the cross sections of the specimens oxidized at 1200°C for 50 h: (a, d) Nb 25 , which was confirmed by EDS.…”

Section: Oxidation Behaviormentioning

confidence: 99%

Effect of Cr Addition on the Phase Equilibria and Oxidation Behavior of NbSi<sub>2</sub>

2019

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Effect of Cr addition on the phase equilibria and oxidation behavior of NbSi 2 was investigated. Although the crystal structures of NbSi 2 and CrSi 2 are both C40, they form separated ranges of homogeneities in the NbCrSi ternary system. The vertical section passing through the NbSi 2 and CrSi 2 binary edges were experimentally determined. A binary NbSi 2 alloy exhibited poor oxidation resistance, showing pest-like behavior upon cyclic oxidation at temperatures from 800 to 1200°C. On the other hand, Cr addition significantly improved the oxidation resistance of NbSi 2 . The oxide layers that developed on the NbCrSi ternary alloys consisted of NbCrO 4 , Cr 2 O 3 , and SiO 2 , and the formation of Cr 2 O 3 and NbCrO 4 suppresses the Nb 2 O 5 formation, and thereby suppresses the pest-like behavior of the binary NbSi 2 alloy. However large Cr additions that exceed the solubility limit of NbSi 2 should not be suitable, because NbSi 2 /CrSi 2 alloys were susceptible to spalling and disintegration of the oxide scales upon cyclic oxidation. [

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Section: Oxidation Behaviormentioning

confidence: 99%

Effect of Cr Addition on the Phase Equilibria and Oxidation Behavior of NbSi<sub>2</sub>

2019

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“…However, the above-mentioned coating may lose efficacy rapidly when copper alloys are used under severe environment. The transition metal silicide Cr 3 Si, with a cubic Al5 crystal structure, has drawn researchers’ attention with respect to applying it as a coating material, due to its outstanding balance of low density, high melting point, unique chemical composition, covalent-dominated strong atomic bonds, excellent elevated-temperature creep strength and high-temperature oxidation resistance [ 10 , 11 ]. Cr 3 Si-reinforced laser clad intermetallic coatings were fabricated on a substrate of austenitic stainless steel 1Cr18Ni9Ti by Wang et al [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructures Evolution and Micromechanics Features of Ni-Cr-Si Coatings Deposited on Copper by Laser Cladding

Zhang

2018

Materials

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Three Ni-Cr-Si coatings were synthesized on the surface of copper by laser cladding. The microstructures of the coatings were characterized by optical microscopy (OM), X-ray diffraction (XRD), and scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS). According to the analysis results of phase compositions, Gibbs free energy change and microstructures, the phases of three coatings appeared were Cr3Si+γ-Ni+Cuss (Coating 1, Ni-26Cr-29Si), Cr6Ni16Si7+Ni2Si+Cuss (Coating 2, Ni-10Cr-30Si) and Cr3Ni5Si2+Cr2Ni3+Cuss (Coating 3, Ni-29Cr-16Si). The crystal growth in the solidification process was analyzed with a modified model, which is a combination of Kurz-Giovanola-Trivedi (KGT) and Lipton-Kurz-Trivedi (LKT) models. The dendrite tip undercooling in Coating 2 was higher than those of Coating 1 and Coating 3. Well-developed dendrites were found in Coating 2. A modification of Hunt’s model was adopted to describe the morphological differences in the three coatings. The results show that Coating 1 was in the equiaxed dendrite region, while Coatings 2 and 3 were in the columnar dendrite region. The average friction coefficients of the three coatings were 0.45, 0.5 and 0.4, respectively. Obvious plastic deformation could be found in the subsurface zone of Coatings 2 and 3.

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“…In this system, the A15 intermetallic phase is a source of high temperature strength and oxidation resistance and Cr ss is a potential source of ductility and oxidation resistance . To the best of our knowledge, there are only few studies regarding the oxidation behavior of single phase Cr 3 Si and the Cr ss –Cr 3 Si system at high temperatures .…”

Section: Introductionmentioning

confidence: 99%

On ultra‐high temperature oxidation of Cr–Cr₃Si alloys: Effect of germanium

Soleimani-Dorcheh

Donner

Galetz

2014

Materials & Corrosion

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The oxidation behavior of Cr–Cr3(Si1−XGeX) alloys with the composition range Cr85GeXSi1−X (0 < X < 15) was studied at 1350 °C. Thermogravimetric measurements showed improved oxidation kinetics by alloying up to 2 at% of Ge, but a significant weight loss was observed when higher Ge was added. Phase analysis and composition of the spalled oxide scales and subscale alloy substrates revealed that eskolaite (Cr2O3) forms the protective scale, while SiO2 (cristobalite) is locally formed below the chromia scale. Addition of up to 2 at% altered the morphology of locally formed silica and subsequently affected the spallation of chromia scale. The morphological observations of the different chromia scales are discussed for all alloys oxidized at 1350 °C.

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An evaluation of the properties of Cr3Si alloyed with Mo

Cited by 64 publications

References 11 publications

Effect of Cr Addition on the Phase Equilibria and Oxidation Behavior of NbSi<sub>2</sub>

Effect of Cr Addition on the Phase Equilibria and Oxidation Behavior of NbSi<sub>2</sub>

Microstructures Evolution and Micromechanics Features of Ni-Cr-Si Coatings Deposited on Copper by Laser Cladding

On ultra‐high temperature oxidation of Cr–Cr₃Si alloys: Effect of germanium

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An evaluation of the properties of Cr3Si alloyed with Mo

Cited by 64 publications

References 11 publications

Effect of Cr Addition on the Phase Equilibria and Oxidation Behavior of NbSi<sub>2</sub>

Effect of Cr Addition on the Phase Equilibria and Oxidation Behavior of NbSi<sub>2</sub>

Microstructures Evolution and Micromechanics Features of Ni-Cr-Si Coatings Deposited on Copper by Laser Cladding

On ultra‐high temperature oxidation of Cr–Cr3Si alloys: Effect of germanium

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On ultra‐high temperature oxidation of Cr–Cr₃Si alloys: Effect of germanium