Results 221 to 230 of about 19,260 (264)

Rejuvenation heat treatment's influence on the microstructure and properties of superalloys

Materials Science and Technology, 2018
Rejuvenation heat treatment is an important technology to restore damaged microstructure and properties of superalloys. This investigation is conducted to figure out the effect of rejuvenation heat treatment on the superalloys. The microstructure and micro-hardness of K002 and DZ125 superalloys after different heat treatment procedures were evaluated.
Zheng Zhang
exaly   +2 more sources

Effect of Rejuvenation Heat Treatment on the Degraded Turbine Blades

Journal of Failure Analysis and Prevention, 2020
This paper presents a novel approach to estimate the extended lifetime of first-stage turbine blades made of directionally solidified GTD-111 nickel-based superalloys. These turbine blades were removed from land-based industrial gas turbines for power generation.
Khier Sabri
exaly   +2 more sources

Effects of rejuvenation heat treatment on microstructure and creep property of a Ni-based single crystal superalloy

Journal of Materials Science and 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
exaly   +2 more sources

Rejuvenation of retired power cables by heat treatment

IEEE Transactions on Dielectrics and Electrical Insulation, 2019
A possible rejuvenation method of a power cable insulated with cross-linked polyethylene (XLPE) is presented. Samples with the shape of a film with a thickness of about 0.4 mm was peeled from two retired 110 kV cables and their spare cable. First, the peeled samples were annealed at 85, 90, 95 and 100 °C.
Yue Xie, Gang Liu, Yifeng Zhao
exaly   +2 more sources

The effect of rejuvenation heat treatments on the repair weldability of wrought Alloy 718

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2003
Abstract 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
exaly   +2 more sources

Investigation of grain refinement during a rejuvenation heat treatment of wrought Alloy 718

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2007
Abstract 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
exaly   +2 more sources

Microstructural evolution and restoration of creep property for a damaged K403 alloy after rejuvenation heat treatments

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 ...
Xiao-Guang Yang, Hong-Yu Qi, Duo-Qi Shi
exaly   +2 more sources

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