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Investigation of grain refinement during a rejuvenation heat treatment of wrought Alloy 718
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2007Abstract The grain refinement resulting from a rejuvenation heat treatment (RHT) of Alloy 718 was investigated by using both metallographic analysis and orientation imaging microscopy (OIM). A step heat treatment was used to show that a phase transformation induced recrystallization process did not occur and supported static recrystallization as the ...
M Qian
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Rare Metals, 2020
Abstract Rejuvenation heat treatments can restore the microstructures and mechanical properties of the degraded turbine blades in gas turbine engines. Herein we analyze the effects of rejuvenation heat treatments on the microstructural characteristics and mechanical properties of damaged and undamaged specimens of a Ni‐based ...
Xiaoguang Yang, Hongyu Qi, Duoqi Shi
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Abstract Rejuvenation heat treatments can restore the microstructures and mechanical properties of the degraded turbine blades in gas turbine engines. Herein we analyze the effects of rejuvenation heat treatments on the microstructural characteristics and mechanical properties of damaged and undamaged specimens of a Ni‐based ...
Xiaoguang Yang, Hongyu Qi, Duoqi Shi
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Rejuvenation Heat Treatments and Their Role in the Repair of IN738 Turbine Components
Volume 3: Turbo Expo 2002, Parts A and B, 2002The thermal processing of turbine engine components is a critical step in the repair and rejuvenation of turbine section hardware to ensure optimal performance and reliability. In the repair process, the thermal process regime must meet the following requirements; improving the weldability of the alloy prior to the repair process (if necessary ...
Warren M. Miglietti +2 more
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Journal of Alloys and Compounds, 2020
Abstract The directionally solidified Ni-based superalloy is used in gas turbine blades for advanced aircraft engines because of its high stability and favorable properties at elevated temperatures. The microstructures of superalloys degrade when they are exposed to long-term services, and the recovery of these damaged microstructures in a real ...
Peiyu Zhang +5 more
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Abstract The directionally solidified Ni-based superalloy is used in gas turbine blades for advanced aircraft engines because of its high stability and favorable properties at elevated temperatures. The microstructures of superalloys degrade when they are exposed to long-term services, and the recovery of these damaged microstructures in a real ...
Peiyu Zhang +5 more
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Rejuvenation Heat Treatment of Single Crystal Gas Turbine Blades
Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy, 2017Thermal degradation of precipitation-hardened nickel based superalloys has been demonstrated to be reversible through full solution rejuvenation heat treatment processing. The specific concern with full solution rejuvenation heat treatment of single crystal alloys is the formation of recrystallized grains on surfaces with residual stress. The threshold
J. Kuipers, K. Wiens, B. Ruggiero
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Rejuvenation of degraded first stage gas turbine nozzle by heat treatment
Journal of Alloys and Compounds, 2010Abstract The present work was carried out to investigate the effect of heat treatment process on the rejuvenation of degraded first stage gas turbine nozzle microstructure and mechanical properties. In fact, microstructural investigation of the degraded first stage nozzle revealed the presence of continuous film of carbides at the grain boundaries of
Sh. Zangeneh, H. Farhangi, H.R. Lashgari
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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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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 Testing, 2021
Abstract IN-738 turbine blade samples, deteriorated after long term service at high temperatures, were solution heat-treated at two temperatures, 1398 K and 1473 K, for 7.2 ks. Subsequently, the samples were cooled down in different atmospheres, in air and in furnace, for the purpose of studying the effects of different cooling media ...
Chuleeporn Paa-rai +2 more
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Abstract IN-738 turbine blade samples, deteriorated after long term service at high temperatures, were solution heat-treated at two temperatures, 1398 K and 1473 K, for 7.2 ks. Subsequently, the samples were cooled down in different atmospheres, in air and in furnace, for the purpose of studying the effects of different cooling media ...
Chuleeporn Paa-rai +2 more
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Journal of Mechanical Science and Technology, 2020
The maintenance of the gas turbine blades is important because these blades are operated in harsh conditions. Therefore, nickel-based superalloys that offer excellent performances in high-temperature conditions are typically used, and the blades are inspected and replaced based on the manufacturer’s maintenance standards.
Sungho Yang +2 more
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The maintenance of the gas turbine blades is important because these blades are operated in harsh conditions. Therefore, nickel-based superalloys that offer excellent performances in high-temperature conditions are typically used, and the blades are inspected and replaced based on the manufacturer’s maintenance standards.
Sungho Yang +2 more
openaire +1 more source