Results 241 to 250 of about 19,335 (278)
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Materials at High Temperatures, 2018
Effect of heat treatment on the recovery of microstructure and mechanical properties of a service-exposed IN939 superalloy was studied. Four-stage heat treatment was performed on the service-exposed alloy. The microstructures of the service-exposed and rejuvenated alloys were examined by optical and scanning electron microscopes. The hardness, tension,
M. Abedini, M. R. Jahangiri, P. Karimi
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Effect of heat treatment on the recovery of microstructure and mechanical properties of a service-exposed IN939 superalloy was studied. Four-stage heat treatment was performed on the service-exposed alloy. The microstructures of the service-exposed and rejuvenated alloys were examined by optical and scanning electron microscopes. The hardness, tension,
M. Abedini, M. R. Jahangiri, P. Karimi
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Rejuvenation of Fracture Properties of Irradiated Zr-2.5 Nb by Heat Treatment
1992Neutron irradiation can reduce the flaw tolerance of cold-worked Zr-2.5 Nb. One possible way to retrieve the good fracture properties is to remove the irradiation damage by heat treatment. The results of experiments have shown that a short heat treatment can be effective; for example, 10 min at 550°C reduces the velocity of delayed hydride cracking by ...
CE Coleman +5 more
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Key Engineering Materials, 2020
This work investigates the effect of rejuvenation heat treatment, with double-step solution treatment at the temperature from 1150 °C to 1200 °C, on the recovered microstructure of IN-738 cast superalloy. The superalloy has been long-term exposed as a turbine blade in a gas turbine prior to this study.
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This work investigates the effect of rejuvenation heat treatment, with double-step solution treatment at the temperature from 1150 °C to 1200 °C, on the recovered microstructure of IN-738 cast superalloy. The superalloy has been long-term exposed as a turbine blade in a gas turbine prior to this study.
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Materials Science Forum, 2017
Udimet 520 is a low precipitation strengthened nickel-based superalloy, which was designed and developed to be gas turbine blades at elevated temperatures. However, after long-term service under high stresses and temperatures, the microstructure of the turbine blades could be continually degraded.
Kritsayanee Saelor, Panyawat Wangyao
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Udimet 520 is a low precipitation strengthened nickel-based superalloy, which was designed and developed to be gas turbine blades at elevated temperatures. However, after long-term service under high stresses and temperatures, the microstructure of the turbine blades could be continually degraded.
Kritsayanee Saelor, Panyawat Wangyao
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Materials at High Temperatures, 2001
AbstractSheet materials for hot gas path components in modern land based gas turbines demand high strength over the temperature range 650–950°C and freedom from serious in-service embrittlement. This is particularly critical where a gas turbine is subject to cycling since thermal stresses can lead to the cracking of such components.
Ian J. Storey +4 more
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AbstractSheet materials for hot gas path components in modern land based gas turbines demand high strength over the temperature range 650–950°C and freedom from serious in-service embrittlement. This is particularly critical where a gas turbine is subject to cycling since thermal stresses can lead to the cracking of such components.
Ian J. Storey +4 more
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Rare Metals, 2016
Abstract The morphological evolution of γ′ precipitates for a damaged nickel‐based superalloy GTD‐111 under different rejuvenation heat treatments (RHTs) was investigated. The degenerated γ′ precipitates can be completely dissolved into the γ matrix under the full solution condition of 1200 °C/2 h, and only fine γ′ precipitates re ...
Xiao‐Meng Wang +4 more
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Abstract The morphological evolution of γ′ precipitates for a damaged nickel‐based superalloy GTD‐111 under different rejuvenation heat treatments (RHTs) was investigated. The degenerated γ′ precipitates can be completely dissolved into the γ matrix under the full solution condition of 1200 °C/2 h, and only fine γ′ precipitates re ...
Xiao‐Meng Wang +4 more
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Materials Science and Technology, 2013
The gamma prime ( γ′) distribution in the Ni based superalloy, CMSX-4, has been examined in detail using a field emission gun scanning electron microscope and a transmission electron microscope after high temperature degradation and the subsequent application of a number of rejuvenation heat treatments.
Z Yao +3 more
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The gamma prime ( γ′) distribution in the Ni based superalloy, CMSX-4, has been examined in detail using a field emission gun scanning electron microscope and a transmission electron microscope after high temperature degradation and the subsequent application of a number of rejuvenation heat treatments.
Z Yao +3 more
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Materials Science and Technology, 2012
The present study investigates the evolution of γ′ precipitate microstructure in a creep damaged IN738LC superalloy during different stages of rejuvenation heat treatment cycles. Dissolution of coarsened γ′ precipitates in the creep damaged alloy occurred during different solution treatments.
S S Hosseini, S Nategh, A-A Ekrami
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The present study investigates the evolution of γ′ precipitate microstructure in a creep damaged IN738LC superalloy during different stages of rejuvenation heat treatment cycles. Dissolution of coarsened γ′ precipitates in the creep damaged alloy occurred during different solution treatments.
S S Hosseini, S Nategh, A-A Ekrami
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Volume 9: Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications; Steam Turbine
Abstract Single crystal superalloys are widely used for gas turbine blades exposed to high stresses, high temperatures in aggressive environments. When these components reach their serviceable limit, they must be replaced by new ones, with an important impact in terms of maintenance costs.
Cristina Motta +3 more
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Abstract Single crystal superalloys are widely used for gas turbine blades exposed to high stresses, high temperatures in aggressive environments. When these components reach their serviceable limit, they must be replaced by new ones, with an important impact in terms of maintenance costs.
Cristina Motta +3 more
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