Effects of solutionizing cooling processing on γ″ (Ni3Nb) phase and work hardening characteristics of a Ni-Fe-Cr-base superalloy

Lin, Y.C.; Yang, Hui; Li, Ling

doi:10.1016/j.vacuum.2017.07.025

Cited by 27 publications

(10 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tensile specimens were machined according to ISO 6982‐2 and the detailed geometry dimensions are presented in Figure a. To systemically investigate the influences of initial microstructures on PLC effect, three different kinds of initial microstructures were prepared by the following heat treatments . 1) ST treatment: solution treated at 1313 K for 0.75 h and air cooled; 2) HS treatment: ST superalloy aged at 993 K for 8 h and furnace cooled at a rate of 50 K h −1 to 893 K for 8 h in order to obtain γ′ and γ″ phases; (3) SAT treatment: the ST superalloy aged at 1173 K for 24 h and air cooled to precipitate δ phase.…”

Section: Methodsmentioning

confidence: 99%

“…Usually, the complex precipitates of a Ni‐based superalloy, such as the strengthening phases of γ″ (Ni 3 Nb) with DO 22 structure, spherical γ′ (Ni 3 Al) particles with L1 2 structure and equilibrium phase of δ (Ni 3 Nb) with orthorhombic DO a structure, have significant effects on mechanical performances . Although several researchers have investigated the PLC effect in some Ni‐based superalloys, few papers present the influences of initial microstructures with different precipitates on PLC effect and mechanical properties at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influences of Initial Microstructures on Portevin‐Le Chatelier Effect and Mechanical Properties of a Ni–Fe–Cr–Base Superalloy

et al. 2018

Self Cite

View full text Add to dashboard Cite

Effects of initial microstructures on the Portevin-Le Chatelier effect (PLC) and mechanical properties of a Ni-Fe-Cr-base superalloy are investigated by hot tensile deformation tests. The inverse PLC effect only occurs in the ST (solution treated) and SAT (solution plus δ phases aging precipitation) superalloys when the deformation temperature is above 873 K. Effects of initial microstructures on the temperature range of PLC effect are obvious, that is, the narrowest temperature range for the HS (solution plus γ 0 /γ 00 phases aging precipitation) superalloy, while the widest temperature range for the ST superalloy. The average activation energy for type A/AþB/B serrations can be determined as 65-81 kJ mol À1 , which contributes to the migration of carbon atoms through pipe diffusion. Meanwhile, the average activation energy for type C serration is about 132-175 kJ mol À1 , which is induced by the pipe diffusion of substitutional atoms. An obvious increase in the yield strength with increasing the deformation temperature from 900 to 973 K is observed for the ST and SAT superalloys. Also, the negative strain rate sensitivity is found in the PLC effect regime. The ST and HS superalloys exhibit the ductile fracture. However, a mixture of ductile transgranular and cleavage fracture is observed in the SAT superalloy.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influences of Initial Microstructures on Portevin‐Le Chatelier Effect and Mechanical Properties of a Ni–Fe–Cr–Base Superalloy

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…1c). A higher temperature solution treatment was imparted to specimens to study the effect of solution treatment temperature on [9,10]. XH 67 is intended to be used as the base material for parts subjected to high temperatures and are given metal-ceramics coating which need high temperature firing.…”

Section: Optical Microstructure Observationsmentioning

confidence: 99%

Microstructural Characterization of XH 67 Nickel-Based Superalloy Under Different Heat Treatment Conditions

Jalaja

Chakravadhanula

Manwatkar

et al. 2021

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

XH 67 is a nickel-based superalloy, which is used in critical parts of modern aerospace engines. In the present study, XH 67 specimens in five different heat treatment conditions selected based on the processing and application have been investigated for their microstructures, morphology, and composition of the matrix and second-phase particles. Optical microscopic (OM) analysis revealed the presence of bi-model neck-lace type grains and equiaxed grains as a result of different heat treatment conditions. Scanning electron microscopy (SEM) and elemental composition analysis revealed precipitates and second-phase particles. Carbides such as Ti (N, C) and (W, Mo, Ti) C were observed having different sizes and shapes. Cr-rich carbide phases were found to be preferentially segregated along the grain boundaries. X-ray diffraction analysis was carried out for assessing the phases present in the alloy. X-ray diffraction analysis revealed the gamma matrix and the precipitate phase are crystallographically identical (coherent). Transmission electron microscopic (TEM) analysis of the specimens confirmed the presence of uniformly distributed spherical Ni 3 (Al, Ti) precipitates which impart thermal stability to the superalloy. Presence of different types of carbides is also revealed by TEM analysis.

show abstract

“…Y.C. Lin et al [31] investigated on work hardening of superalloy can be achieved by solutionizing cooling process. With raise in temperature the size of γ″ phase rapidly decreases.…”

Section: Tensile Strength In Gas Turbine Materialsmentioning

confidence: 99%

Comprehensive report on Materials for Gas Turbine Engine Components

2019

IJITEE

View full text Add to dashboard Cite

In the past three decades, it is very challenging for the researchers to design and development a best gas turbine engine component. Engine component has to face different operating conditions at different working environments. Nickel based superalloys are the best material to design turbine components. Inconel 718, Inconel 617, Hastelloy, Monel and Udimet are the common material used for turbine components. Directional solidification is one of the conventional casting routes followed to develop turbine blades. It is also reported that the raw materials are heat treated / age hardened to enrich the desired properties of the material implementation. Accordingly they are highly susceptible to mechanical and thermal stresses while operating. The hot section of the turbine components will experience repeated thermal stress. The halides in the combination of sulfur, chlorides and vanadate are deposited as molten salt on the surface of the turbine blade. On prolonged exposure the surface of the turbine blade starts to peel as an oxide scale. Microscopic images are the supportive results to compare the surface morphology after complete oxidation / corrosion studies. The spectroscopic results are useful to identify the elemental analysis over oxides formed. The predominant oxides observed are NiO, Cr2O3, Fe2O3 and NiCr2O4. These oxides are vulnerable on prolonged exposure and according to PB ratio the passivation are very less. In recent research, the invention on nickel based superalloys turbine blades produced through other advanced manufacturing process is also compared. A summary was made through comparing the conventional material and advanced materials performance of turbine blade material for high temperature performance.

show abstract

Effects of solutionizing cooling processing on γ″ (Ni3Nb) phase and work hardening characteristics of a Ni-Fe-Cr-base superalloy

Cited by 27 publications

References 45 publications

Influences of Initial Microstructures on Portevin‐Le Chatelier Effect and Mechanical Properties of a Ni–Fe–Cr–Base Superalloy

Influences of Initial Microstructures on Portevin‐Le Chatelier Effect and Mechanical Properties of a Ni–Fe–Cr–Base Superalloy

Microstructural Characterization of XH 67 Nickel-Based Superalloy Under Different Heat Treatment Conditions

Comprehensive report on Materials for Gas Turbine Engine Components

Contact Info

Product

Resources

About