A newly developed Tribaloy alloy with increased ductility

Liu, Rong; Xu, Weiya; Yao, Matthew; Patnaik, P. C.; Wu, Xijia

doi:10.1016/j.scriptamat.2005.08.033

“…Lower volume fraction of Laves phase is obtained reducing Chromium and Silicon content on the cast T400 alloy. So, higher ductility and toughness is obtained for tribaloy alloys, as previously reported [5][6][7][8].…”

Section: Bohatch Et Alsupporting

confidence: 83%

Influence of Processing on the Microstructure and Properties of CoCrMoSi Alloy PTA Coatings

Bohatch

¹

,

Siqueira

²

,

́Oliveira

³

et al. 2015

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Wear performance as well as the low toughness of CoCrMoSi alloys is associated with the presence of Laves phase. In light of this, alloying elements have been altered in order to reduce the brittleness of newly-cast alloys. This study evaluated coatings by Plasma Transferred Arc (PTA) with different interactions with the AISI 316L substrate. The higher the dilution, it was hypothesized, the higher Iron, Chromium and Nickel contents proceeding from substrate and, therefore, the lower hard Laves phase fraction. Coatings were characterized by light and scanning electron microscopy, X-ray diffraction and Vickers hardness. Wear behavior was assessed by pin-on-disc and ball-on-flat tests. Laves phase and Cobalt solid solution eutectic lamellar microstructure was observed for coating processed with 120A (18% dilution). The chemical composition was displaced to hypoeutectic, showing Cobalt solid solution dendrites and interdendrictic eutectic lamellar for the coatings processed with higher current intensity (150 / 180A), due to the higher interaction with the substrate (26 / 38% dilution). Dilution increased with the deposition current, causing hardness to decrease from 702 -526 HV 0.5 . Wear mass loss rate increased by up to 41.7% and friction coefficient (μ) ranged from 0.45 -1.06 as the chemical composition changed. Key-words:CoMoCrSi alloy; Plasma transferred arc; Dilution; Microstructure; Wear behavior. Influência do Processamento sobre a Microestrutura e Propriedades de Revestimentos da liga CoCrMoSi por PTAResumo: O desempenho em desgaste e a tenacidade das ligas CoCrMoSi estão associados à presença de fase de Laves. Neste sentido, o teor de elementos de liga vem sendo alterado para reduzir a fragilidade em algumas ligas recentemente propostas. O presente estudo avaliou revestimentos por Plasma com Arco Transferido (PTA) para diferentes graus de interação com o substrato de aço AISI 316L. Por hipótese, uma maior diluição promoverá maior teor de ferro, cromo e níquel oriundos do substrato e, portanto, uma menor fração de fase dura de Laves. Os revestimentos foram caracterizados por microscopia ótica e eletrônica e varredura, difração de raios-X e dureza Vickers. O comportamento em desgaste foi avaliado a partir de ensaios tipo pino sobre disco e esfera sobre superfície plana. Microestrutura eutética lamelar composta por fase Laves e solução sólida em Cobalto foi observada para a deposição com corrente de 120 A (18% diluição). A composição química foi deslocada para hipoeutética, mostrando dendritas de solução sólida em Cobalto e região eutética lamelar para os revestimentos depositados com correntes de 150 e 180 A (26 e 38% diluição). A diluição aumentou com a corrente e deposição, levando à redução na dureza de 702 -526 HV 0.5 . A taxa de perda de massa em desgaste aumentou em 41.7% enquanto o coeficiente de atrito (μ) variou entre 0.45 -1.06 à medida que a composição química foi alterada.Palavras-Chave: Liga CoMoCrSi; Plasma com arco transferido; Diluição; Microestrutura; Comportamento em desgaste.

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“…The fact is that, as seen from generally accepted binary phase diagrams of Co-Cr and Cr-Mo, at approximately the same proportions of components as in the corresponding diffusion couples of the Со 53 Мо 35 Сr 12 alloy, only a phase separation takes place at high temperatures between the atoms of Cr and Co, Cr and Mo [58,76,81]. It is suggested that it occurs in the entire heating temperature range [76].…”

Section: Co 53 Mo 35 Cr 12 Superalloymentioning

confidence: 97%

“…As it follows from reference75, it is at Chemical Bond in Metallic Alloys: Electron Microscopic Study The diffusion processes in the Co 53 Mo 35 Cr 12 alloy were considered as occurring in three diffusion couples -Co/Mo, Co/Cr and Mo/Cr [81]. It was believed that phase transitions occurring in these diffusion couples, proceed similarly to phase changes in the corresponding binary alloy systems of Co-Mo, Co-Cr and MoCr.…”

Section: Chemical Bond In Metallic Alloys: Electron Microscopic Studymentioning

confidence: 99%

“…Thus, the author of investigating the Co 53 Mo 35 Cr 12 alloy, did not find in it any phases, close to Laves phases in the structure and morphology [81]. Therefore, explaining the high hardness and wear resistance of the alloy by precipitation of particles of Laves phases in it [79,80,82] 1.…”

Section: Chemical Bond In Metallic Alloys: Electron Microscopic Studymentioning

confidence: 99%

“…An attempt was made to experimentally determine due to what kind of chemical interactions, and under what thermal conditions Laves phases are formed in the system of Co-Mo-Cr [81]. The fact is that, as seen from generally accepted binary phase diagrams of Co-Cr and Cr-Mo, at approximately the same proportions of components as in the corresponding diffusion couples of the Со 53 Мо 35 Сr 12 alloy, only a phase separation takes place at high temperatures between the atoms of Cr and Co, Cr and Mo [58,76,81].…”

Section: Co 53 Mo 35 Cr 12 Superalloymentioning

confidence: 99%

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Chemical Bond in Metallic Alloys: Electron Microscopic Study

Ustinovshikov¹

2017

NSTOA

0

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Aplastic anemia in systemic lupus erythematosus: A better prognosis acquired aplastic anemia Copyright: © 2016 Pannu and VarmaThe first experimental study to verify the existence of the high-temperature phase separation in alloys of the ironchromium system was undertaken by the example of the Fe-45% Cr alloy [15]. Using the method of TEM, it was found that the microstructure of this alloy after quenching from 1150 -1200°С was similar to that which had been obtained in Reference [14]. However, they interpreted such precipitations as chromium nitrides, i.e., as a kind of an "added" phase formed by the chemical reaction of chromium atoms (from the alloy) with atoms of nitrogen (from the air) during a high temperature heat treatment for quenching. A second study was conducted using the Fe 51 Cr 49 alloy, with the help of Mossbauer spectroscopy [16]. It is obvious that the choice of the method of research in Reference was poor, since it was hardly possible to judge a local phase separation of the alloy by the change of the partial gamma-resonance peaks corresponding to pure iron. Therefore, they did not manage to find the structure of phase separation [16]. Figure 2 shows the iron-rich part of an iron-chromium phase diagram, built on the results of electron microscopic studies of the microstructure of alloys of iron with 20, 30, 40 and 50 wt. % of chromium [17]. From the diagram, it can be seen that in the Fe-Cr system, there occur two phase transitions, in the result of which, for example, the microstructure that has formed as a consequence of the tendency to ordering is dissolving and a microstructure of phase separation is forming in its place (and vice versa). This occurs within the temperature ranges of 1100 -850°C and 600 -550°C (Figure 2) On the basis of these data, it could be concluded that at the level of microstructures, such a phase transition is bound to pass through the stage of the existence of the solid solution in the alloy. The authors have given this phase transition the name "orderingphase separation" [17]. Since the discovery of this transition, 17 binary systems have so far been studied and in 16 of them the transition has been experimentally found. The transition occurs at a temperature, specific for each system, at which the sign of the chemical interaction between atoms of A and B is reversed. It is obvious that the transformation of the microstructure formed as a result of the tendency to ordering into the microstructure formed as a result of the tendency to phase separation, and vice versa, is a consequence of the phase transition ordering -phase separation. The transition itself, that is, the process of changing the sign of the chemical interaction between dissimilar atoms, occurs at the level of changes in the electronic structure of the alloy.Before considering the physical essence of this transition, we would like to decide on the issue of the use of such terms as "ordering energy", "mixing energy", "enthalpy of mixing" and so on. Each of the above terms refers to basically the same no...

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Intermetallics

Sauthoff

¹

2006

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 1.1. Definition of Intermetallics 1.2. Historical Remarks 2. General Considerations 2.1. Crystal Structure and Compound Stability 2.2. Basic Properties 2.3. Criteria for Compound Selection 3. Magnetic Materials 3.1. AlNiCo Alloys 3.2. FeCo Alloys 3.3. Sendust Alloy 3.4. Laves Phases 3.5. Rare‐Earth Compounds 4. Superconducting Materials 4.1. Laves Phases 4.2. A15 Compounds 4.2.1. V 3 Si 4.2.2. V 3 Ga 4.2.3. Nb 3 Sn 4.2.4. Nb 3 Al 4.2.5. Nb 3 Si 5. Electronic Materials 5.1. Silicides 5.2. Other Compounds 6. Electric Materials 7. Thermoelectric and Thermomagnetic Materials 7.1. Silicides 7.2. Other Thermoelectric Compounds 7.3. Thermomagnetic Compounds 8. Optical Materials 9. Hydrogen‐Storage Materials 9.1. B2 Compounds 9.2. Laves Phases 9.3. Rare Earth Metal Compounds and Other Phases 10. Electrode Materials 10.1. Mg 2 Ni Alloys 10.2. Laves Phase Alloys 10.3. RNi 5 Alloys 11. Coating Materials 11.1. Aluminides 11.2. Silicides 12. Shape‐Memory Materials 12.1. Cu‐Base Alloys 12.1.1. Cu ‐ Zn ‐ Al Shape Memory Alloys 12.1.2. Cu ‐ Al ‐ Ni Shape‐Memory Alloys 12.2. NiAl Alloys 12.3. NiTi Alloys 13. Medical Biomaterials 14. Dental Materials 14.1. Amalgams 14.2. Cu ‐ Au Alloys 15. Wear‐Resistant Materials 16. Structural High‐Temperature Materials 16.1. Titanium Aluminide Alloys 16.1.1. Ti 3 Al Alloys 16.1.2. TiAl Alloys 16.2. Iron Aluminide Alloys 16.2.1. Fe 3 Al Alloys 16.2.2. FeAl Alloys 16.3. Nickel Aluminide Alloys 16.3.1. Ni 3 Al alloys 16.3.2. NiAl Alloys 16.4. Silicide Alloys

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A newly developed Tribaloy alloy with increased ductility

Cited by 27 publications

References 7 publications

Influence of Processing on the Microstructure and Properties of CoCrMoSi Alloy PTA Coatings

Influence of Processing on the Microstructure and Properties of CoCrMoSi Alloy PTA Coatings

Chemical Bond in Metallic Alloys: Electron Microscopic Study

Intermetallics

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