γ-γ γ hardness test|Effect of Alloying on the Microstructure, Phase Stability, Hardness : agency Nano-hardness measurements have been conducted on the three constituting phases α2, γ and βo after hot-isostatic pressing, whereas the hardness modification during heat-treatment was studied by . Supports The Most Popular Sources. You can check regularly updated supported sources list.
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The effect of alloy composition and cooling rate on γ′ morphology, alloy hardness, and γ-γ′ mismatch was studied. When cooling at a slow billet rate, all alloys followed the LSW theory for precipitate coarsening. . Hardness Testing. Microhardness testing was carried out in accordance with ASTM E92-82 using a load of 1 kg. The average size of γ’ precipitates is inversely proportional with cooling rate in logarithmic scale. The hardness measurements display a strong dependence on cooling rate, which is explained by phase field simulation to provide deeper insight into the interaction between dislocation and γ’ precipitates. A body of research on the effect of thermal processing on the microstructure and mechanical properties of MAR-M247 exists. Bor et al. studied the effect of solution and aging heat treatment on the phase composition and properties of the material [7].It was demonstrated that increase in γ′-particle size leads to a decrease in the materials strength and carbides play . The interrelationships between composition, γ′ morphology, hardness and γ–γ′ mismatch were identified for a set of advanced nickel-base polycrystalline superalloys. When cooling from a temperature above the γ′ solvus, i.e. a supersaturated γ matrix, it was found that the cooling rate determines the γ′ morphology and particle .
Nano-hardness measurements have been conducted on the three constituting phases α2, γ and βo after hot-isostatic pressing, whereas the hardness modification during heat-treatment was studied by . This paper presents the high temperature yield and fatigue strength as well as thermophysical properties of two polycrystalline wrought γ/γ′ Co-base superalloys developed for application in a temperature regime above 700 °C. The alloys CoWAlloy1 (Co42Ni32Cr12Al6W3Ti2.5Ta1.5 + Si,C,B,Zr,Hf) and CoWAlloy2 (Co41Ni32Cr12Al9W5 + .
DOI: 10.1016/J.MSEA.2018.10.041 Corpus ID: 139133749; A study of solution cooling rate on γ’ precipitate and hardness of a polycrystalline Ni-based superalloy using a high-throughput methodology Vickers micro-hardness measurement (HV) was taken on all 18 samples, using the micro-hardness testing table-top machine HMV-2 made by SHIMADZU. For all samples, micro-hardness measurements were done at 9.718 N load for 10 s dwell time with a diamond indenter in the form of a right pyramid with a square base. . Due to the maximum density of γ .
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A systematic composition-dependent elastic modulus and hardness for γ-Ni(Al), γ ′-Ni 3 Al and β-NiAl phases were obtained by nanoindentation. Variation of elastic modulus and hardness in the γ-Ni(Al) solid solution is influenced by solid solution strengthening and hardening due to precipitation of γ ′-Ni 3 Al while cooling. The .
Because the nanoindentation hardness was only related to the γ′ precipitates and γ matrix, H γ ′ + γ can be expressed as follows: (11) H γ ′ + γ = f γ H γ + f γ ′ H γ ′ + H SCD, where f γ is estimated by 1 − f γ ′, and the values are 0.498, 0.503, 0.482 and 0.497 for the specimens after SHT and thermal exposure for 500 . It was found that the configurational entropies of constituent γ and γ′ phases, as well as the phase fraction-weighted value being lower than that of the nominal composition. . /STEM analyses were prepared using a dual beam-focus ion beam (DB-FIB, Helios G3 CX, FEI, USA). For mechanical property testing, a Vickers hardness tester (FM-810e . The long-term stability of Inconel 718 and Waspaloy forgings in the 600 °C to 850 °C temperature range and up to 10,000 hours was studied by means of mechanical tests and microstructural analyses. Hardness and tensile properties were found to decrease with increasing over-aging time and temperature. The comparative analysis of tensile results of both alloys .
These sandwich-like γ'′/γ'/γ'′ precipitates exhibit higher thermal stability compared to individual γ′ and γ'′ precipitates [34]. The average size of these precipitates was measured to be around 13 nm. Generally, the sizes of γ′ and γ'′ precipitates directly influence the mechanical properties of the material.
Alloy 720Li displays only a small hardness trough near the weld line in the as-welded condition due to the depletion of γ′, while γ″-strengthened IN718 shows a soft precipitation-free weld . Mechanical properties of TiAl base alloys strongly depend on the microstructure. To understand the effect of microstructures on the properties, it is essential to evaluate the properties of constituent phases. In this study, the Young’s modulus and hardness of β-Ti and γ-TiAl phases were measured using nano-indentation method in Ti–Al–Cr ternary system, and their Cr .A systematic composition-dependent elastic modulus and hardness for γ-Ni(Al), γ′-Ni3Al and β-NiAl phases were obtained by nanoindentation. . A thermal exposure test at 1100 °C in air was .
The increased γ phase resulted in decreased hardness but this change in hardness has shown a clear effect on wear properties. The presence of both γ and α phases in considerable amount in Fe 70 Ni 30 sample resulted in maximum wear resistance thus the COF values were found to be dependent on the phase formation.Compositionally complex polycrystalline γ/γ′ CoNi-base superalloys, such as CoWAlloy2 (Co41-Ni32-Cr12-Al9-W5-Ti0.3-Ta0.2-Si0.4-Hf0.1-C-B-Zr) are interesting candidates for new high-temperature materials. To maximize their high-temperature strength, the γ/γ′ microstructure has to be optimized by adjusting the multi-step heat treatments. Various microstructures after . Co-base superalloys strengthened by coherently embedded Co 3 (Al,W) γ′ precipitates were discovered in 2006 in the ternary system Co–Al–W.1 This novel material class with a γ/γ′ microstructure similar to Ni-base superalloys has the potential for high temperature applications. The strength and creep properties of Co–Al–W-based superalloys are .
The γ phase in Pt-12Al-6Ti exhibited the highest τ a value because of the observed reduction in the gap between Δγ TW and Δγ FS, which decreased from 94.32 mJ/m 2 in Pt to 83.38 mJ/m 2 in Pt-12Al-6Ti. The γ APB, γ CSF and γ SISF values were higher in Pt-12Al-6Ti and Pt-12Al-6Ta than those of Pt 3 Al.
The effects of heat treatment process on microstructure and properties of a nickel base superalloy are investigated. The size of γ´ phase decreases and the stress rupture life of alloy at 1100 °C/60 MPa drops with the rise of cooling rate. The hardness at room temperature also increases. The size of cuboidal γ´ precipitate and the volume of spherical γ´ precipitate increase with the . The effects of elemental repartitioning on the evolution of γ′ precipitates and the hardness of the phase of a novel PM nickel-based superalloy after long-term thermal exposure at 750 °C were investigated in this study. The results showed that the splitting of γ′ particles during exposure was related to the γ′/γ lattice mismatch caused by the partition changes in the .
The present work introduces a novel γ′ phase-strengthened Ir-W-Al-Th superalloy for ultrahigh-temperature applications. First, the as-cast microstructure and phase transformation of Ir-13W-6Al-0.15Th (at%) alloy during solid solution and aging were investigated. Phase transformation was observed during heat treatment. The primary γ′ phase disappeared via the . A novel γ–γ′–γ″ dual-superlattice superalloy, with promising mechanical properties up to elevated temperatures was recently reported by Mignanelli et al. (in: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications, pp 679–690, 2018). The present work employs state-of-the-art chemical and .
The measured γ′ solvus temperatures (T γ′-solvus) and alloy densities of the experimental alloys are listed in Table 1.T γ′-solvus of alloy 5Cr-A and alloy 5Cr–B were ∼1170 °C, indicating good stability of the γ′ phase at high temperature, such as 1000 °C and 1100 °C. The T γ′-solvus of alloy 5Cr–B with higher Al/W ratio was close to, or even higher than that of . The present work studied the effect of Ti, Nb, or Ta addition on the microstructural stability of coherent γ/γ′ phases in the designed [Al-Ni 12](Al 1 (Al/Ti/Nb/Ta) 0.5 (Cr 0.5 Mo 0.5 W 0.5)) superalloys.The coherent microstructure with cuboidal γ′ nanoparticles could be formed during aging at 1173 K in these designed superalloys due to the moderate lattice misfit.
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To investigate the effect of γ/γʹ interface on the nano-deformation of the workpiece during nanoindentation of nickel-based single crystal alloys, a two-phase model of γ phase doped with Cr and Co elements was simulated using a molecular dynamics approach with controlling the indenter displacement. It is found that: in the early stage of loading, the load increases .
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Effect of Alloying on the Microstructure, Phase Stability, Hardness
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γ-γ γ hardness test|Effect of Alloying on the Microstructure, Phase Stability, Hardness