Results 231 to 240 of about 19,335 (278)
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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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Microstructural Rejuvenation Through Non-conventional Heat Treatments of an Inconel 939 Superalloy
MRS Proceedings, 2012ABSTRACTThe microstructural rejuvenation through non-conventional heat treatments (NCHT) of a conventional cast superalloy Inconel 939 was investigated. The primary and secondary main constituents of the NCHT microstructures were characterized through its morphology and composition applying conventional microscopy and analytical scanning electron ...
M. A. González +3 more
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Journal of Materials Science & Technology, 2021
Abstract Both surface and internal microstructures of a second-generation Ni-based single crystal (SX) superalloy were studied after creep and rejuvenation heat treatment (RHT). It is indicated that the microstructures, such as the dislocation network, the γ phase and the γ' phase, can be recovered to those after the standard heat treatment (SHT). It
K.J. Tan +5 more
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Abstract Both surface and internal microstructures of a second-generation Ni-based single crystal (SX) superalloy were studied after creep and rejuvenation heat treatment (RHT). It is indicated that the microstructures, such as the dislocation network, the γ phase and the γ' phase, can be recovered to those after the standard heat treatment (SHT). It
K.J. Tan +5 more
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Journal of Alloys and Compounds, 2012
Abstract IN738LC is one of the superior nickel base superalloys utilized at high temperatures in aggressive environments. However, experiencing high temperatures and stresses during service causes microstructure deterioration and degradation of mechanical properties in this alloy.
Sayyed Shahabeddin Hosseini +2 more
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Abstract IN738LC is one of the superior nickel base superalloys utilized at high temperatures in aggressive environments. However, experiencing high temperatures and stresses during service causes microstructure deterioration and degradation of mechanical properties in this alloy.
Sayyed Shahabeddin Hosseini +2 more
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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 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
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Investigation of grain refinement during a rejuvenation heat treatment of wrought Alloy 718
Materials Science and Engineering: A, 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, J.C. Lippold
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The effect of rejuvenation heat treatments on the repair weldability of wrought Alloy 718
Materials Science and Engineering: A, 2003Abstract Extensive precipitation of needle- and plate-shaped δ-phase in the γ-nickel matrix of wrought Alloy 718 is the major microstructural change resulting from multiple weld repair/post weld heat treatment (PWHT) cycles. Isothermal heat treatments at 954 °C for times up to 100 h were used to simulate the multiple PWHTs in laboratory samples ...
M Qian, J.C Lippold
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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 ...
Liang Wang +4 more
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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 ...
Liang Wang +4 more
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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
openaire +1 more source