Ni-base superalloy
Study of the Oxidation Assisted Intergranular Cracking Mechanism on a Ni-Base Superalloy
... The superalloy 718 is well known for possessing good mechanical properties and corrosion/oxidation resistance over a wide range of temperatures [1 – ...the superalloy as no intergranular brittle fracture ...
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Predicting the onset of rafting of γ' precipitates by channel deformation in a Ni superalloy
... (Received 00 Month 200x; final version received 00 Month 200x) The growth or shrinkage, normal to {001}, of the interfaces between the γ matrix and cuboidal γ ′ precipitates is examined for a Ni-base ...
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Pt-modified Ni aluminides, MCrAlY-base multilayer coatings and TBC systems fabricated by Spark Plasma Sintering for the protection of Ni-base superalloys
... crystal Ni-base superalloy blades, multilayered coatings are devel- oped to respond to several types of ...the superalloy blade, it should be resistant to erosion and to CMAS corrosion, it ...
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Influence of coating on the thermal resistance of a Ni-Based superalloy
... KEY WORDS: thermo-mechanical fatigue, coating, Ni-base superalloy. INTRODUCTION Because of their good high-temperature properties, nickel-base superalloys are among the most currently used ...
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Ni–W diffusion barrier: Its influence on the oxidation behaviour of a β-(Ni,Pt)Al coated fourth generation nickel-base superalloy
... A Ni–W base diffusion barrier (DB) has been developed to limit interdiffusion between a fourth generation Ni-base superalloy (MCNG) and a Pt-modified nickel aluminide ...
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Development of a NiW in-situ diffusion barrier on a fourth generation nickel-base superalloy
... Fig. 1. Principle of a Co-NiW in situ diffusion barrier formation The aim of this work was to study the development of this diffusion barrier in the case of a Ni-base superalloy protected by a ...
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Effect of interdiffusion on mechanical and thermal expansion properties at high temperature of a MCrAlY coated Ni-based superalloy
... the superalloy substrate, and can therefore be considered as a peripheral non-load bearing ...crystal Ni-based superalloys at elevated temperature [4,5,8,9] ...
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Characterization of sulfur distribution in Ni-based superalloy and thermal barrier coatings after high temperature oxidation: a SIMS analysis
... the base level. Around the S-rich areas, this base level is 10 times lower than in the bulk of non-oxidized ...the base level stays particularly low in the interfacial region, in opposition to the ...
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Développement de matériaux hydrurables à base de magnésium par mécanosynthèse: application pour l’électrode négative des batteries Ni-MH.
... la base de ces résultats, nous émettons l'hypothèse que l’accumulation de défauts à la surface et au sein de matériau suite aux déformations plastiques répétées lors des collisions poudre-billes-paroi conduirait à ...
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Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing
... [ 10 ]. Two other studies investigated the penetration depth of O through grain boundaries. The O was found to react with carbon in the metal to form gas bubbles. The estimated activation energy for this reaction is ...
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Influence of the quenching rate and step-wise cooling temperatures on microstructural and tensile properties of PER72 (R) Ni-based superalloy
... iii) The average size, the average distance between particles as well as the number density of γ precipitates are significantly modified by the cooling rate. These differences may indu[r] ...
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Stress corrosion cracking of Ni-base alloys in PWR primary water
... intragranular carbide precipitation (and low grain boundary coverage with carbides) when subjected to extremely severe loadings. - For these cases, an approach based on the strain rate [r] ...
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Contrôle du maclage thermique et de la taille de grains par traitements thermomécaniques dans deux superalliages base de Ni
... 158 Figure V-3 : (a)Taille de grains, (b) densité de joints Σ3 et (c) fraction de macles incohérentes obtenues à l’issue des différents traitements thermomécaniques en compression. 161[r] ...
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Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing
... 3.1.5. Thermodynamic calculations on the relative stability of the different oxides As several oxides were observed in the oxide scale and in the grain boundaries underneath, a thermodynamic analysis was performed in ...
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Ni table, ni dais : qu'est-ce qu'un dois ?
... Si on avance dans le temps, une image italienne correspond peut-être à ce que les textes laissent deviner du dois et, en tout cas, confirme l’existence d’un mobilier de table diversifié 83 . Sur une pleine page enluminée ...
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Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725
... —with quantified statistical significance—that BLIPs are in fact more resistant to H-assisted fracture than non-BLIPs. To determine what physical—rather than merely crystal- lographic—factors are responsible for the ...
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Numerical modelling of the microstructure effect on fatigue behaviour of Ni-base superalloys for turbine disk
... Sansoz, F.: Propagation des petites fissures de fatigue dans les zones de concentration de contraintes dans le superalliage N18. Ph.D. thesis, ´ Ecole Nationale Sup´erieure des Mines de Paris (2000). Schirra, J.; ...
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Ni hommes, ni animaux: les théranthropes. Un aliment pour l'esprit ?
... _Les plus impressionnants des théranthropes figurés par les hommes préhistoriques sont certainement ceux gravés vers le V" millénaire avant notre ère dans le Sahara liby[r] ...
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Ni sédentaires, ni oiseaux de passage : les Algériens à Naples
... Dans ce cadre, l’anomalie que représente le cas des Algériens, qui sont peu nombreux en Italie mais concentrés dans certaines régions et en premier lieu en Campanie, peut servir d’analy[r] ...
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Ni maître ni esclave chez les horloges biologiques
... Ce modèle s’ap- puie notamment sur le fait que la lésion des NSC entraîne une perte des rythmes périphériques, que l’activité rythmique des neurones des NSC s’amortit[r] ...
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