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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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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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Failure analysis and rejuvenation heat treatment of a martensitic stainless steel gate valve stem
Engineering Failure AnalysisH.R. Lashgari +4 more
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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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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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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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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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Rejuvenation Heat Treatment and Weld Repairability Studies of HAYNES® 230® Alloy
Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, 2000A series of studies were undertaken to determine the optimum rejuvenation heat treatment of HAYNES 230 alloy and to examine its weld repairability. To simulate service exposure, samples of plate nominally 4.75 mm (0.187 in.) thick were exposed at temperatures of 760°C (1400°F) and 871°C (1600°F) for a period of 1500 hours.
Dwaine L. Klarstrom +3 more
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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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