Microstructures' effects on high temperature fatigue failure behavior of typical superalloys

Zhang, L.N.; Wang, P.; Dong, Jie; Zhang, M.C.

doi:10.1016/j.msea.2013.08.065

Cited by 21 publications

(8 citation statements)

References 37 publications

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“…Although it is difficult to vary the grain size while keeping other microstructural features identical, it is possible to vary the γ′ size (especially secondary and tertiary γ′ size) while keeping the grain size identical. As shown in Zhang's study [98], fine secondary and tertiary γ′ can provide better cycle-dependent FCG resistance compared to relatively coarse secondary and tertiary γ′ in a PM superalloy FGH96 using a non-dwell loading waveform. They also observed that the shape of secondary γ′ has an influence on the FCG rate and indicated that secondary γ′ in the shape of a "butterfly" shape presents enhanced resistance, compared to that detected in an octagonal shape as shown in Fig.…”

Section: Effects Of γ′ Precipitatesmentioning

confidence: 78%

Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review

Jiang

Song

Reed

2020

International Journal of Fatigue

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Powder metallurgy (PM) Ni-based superalloys are widely used for aeroengine turbine disc applications due to their excellent mechanical properties and good corrosion resistance at elevated temperatures. Understanding the fatigue crack growth (FCG) mechanisms of PM Ni-based superalloys is important for both disc alloy development and life prediction of disc components in these advanced aeroengines where damage tolerance design prevails. FCG in PM Ni-based superalloys is a complicated function of microstructure, temperature, loading conditions and environment and is usually a consequence of the synergistic effects of fatigue, creep and environmental damage. In this review, the mechanisms controlled by microstructural features including grain size, grain misorientation, γ′ size and distribution on short and long FCG behaviour in PM Ni-based superalloys are discussed. The contribution of creep and environmental damage to FCG has been critically assessed. The competing effects of mechanical damage (i.e. fatigue and creep) and environmental damage at the crack tip are microstructure-sensitive, and usually results in transition between transgranular, mixed-trans-intergranular and intergranular FCG depending on the contribution of environmental damage to FCG processes.

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Section: Effects Of γ′ Precipitatesmentioning

confidence: 78%

Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review

Jiang

Song

Reed

2020

International Journal of Fatigue

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“…A more continuous distribution of carbides at the grain boundary is thought to contribute to the weakening of grain boundary strength. This, in turn, accelerates the time-dependent intergranular process.. [18][19][20][21] For the coarse γ 0 variant, where such a continuous grain boundary carbide distribution is seen, this appears to significantly contribute to enhanced FCG rates under these testing conditions, in contrast to the fine γ 0 variant where relatively discrete carbides formed at the grain boundary. The impact of the more continuous carbide distribution on FCG rate becomes more noticeable at higher temperatures and longer dwell times.…”

Section: Effects Of Microstructure On Fcg Behaviormentioning

confidence: 99%

“…M 23 C 6 or M 6 C carbides continuously formed at a grain boundary can reduce the cohesive force of the grain boundary, which also promotes enhanced intergranular FCG under applied stress. [18][19][20] Volume expansion of the carbides in an oxidizing environment at grain boundaries is related to surface fatigue cracking at erupted carbides. This appears to cause a favored crack growth path along the oxidized carbides on grain boundaries and consequently enhanced intergranular FCG.…”

Section: Introductionmentioning

confidence: 99%

“…The extent of crack growth behavior over time may vary depending on oxidation and creep processes. M 23 C 6 or M 6 C carbides continuously formed at a grain boundary can reduce the cohesive force of the grain boundary, which also promotes enhanced intergranular FCG under applied stress 18–20 . Volume expansion of the carbides in an oxidizing environment at grain boundaries is related to surface fatigue cracking at erupted carbides.…”

Section: Introductionmentioning

confidence: 99%

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2D and 3D characterization of oxidation‐fatigue mechanisms in an advanced Ni‐based superalloy: Effects of microstructure and elevated temperature

Kim,

Jiang,

Reed

2024

Fatigue Fract Eng Mat Struct

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The effects of varying γ′ size and grain boundary carbide distribution at elevated temperatures on the fatigue behavior of turbine disk alloy RR1000 were examined through combining 2D and 3D imaging characterization. The fatigue crack growth rate at 725°C is higher than at 650°C due to enhanced oxidation damage at higher temperature, dominated by an intergranular fracture mode. This is more marked with longer dwell time (linked to diffusion time) and when carbides have formed continuously at grain boundaries. The fatigue crack path was characterized by X‐ray CT scan to present the complex 3D crack propagation morphology. It is noted that a discontinuous crack path and uncracked ligaments can be discerned ahead of the crack tip particularly in the microstructure where carbides are continuously formed at grain boundaries. This is linked to embrittled zones ahead of the crack tip formed during longer dwell times at the maximum stress during cycling at elevated temperature.

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“…The research shows that fatigue failure can be attributed to many factors, such as microstructure, stress ratio, inclusion size, location, etc. [6,7,8]. These inclusions come from deoxidation additions or impurities at the subsurface level, which are the locations for fatigue crack nucleation when gigacycle fatigue levels are reached [9].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics Analysis of Multiple Microelements’ Coupling Behavior in High Fatigue Resistance 50CrVA Spring Steel with Nanoparticles

Wang

Zhou

et al. 2019

Materials

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Solid solution and coupling precipitation behavior of multiple microelements in 50CrVA spring steel under different temperatures were analyzed based on thermodynamics. Quantitative relationships between the multiple microelements’ contents and secondary phases, and their effects on fatigue life, were systematically studied in conjunction with the secondary phase microstructure characterization using scanning and transmission electron microscopy, etc. The solid solution contents of different microelements decreased as the temperature decreased, especially N and Ti, but the number of compounds gradually increased when the temperature decreased. Carbonitride constitutional liquation occurred in 50CrVA-S1# spring steel-containing microparticles, and without carbonitrides, constitutional liquation occurred in 50CrVA-S2# spring steel-containing nanoparticles. The experimental results indicate that the fatigue life reduces by about an order of magnitude when the secondary phase size changes from nanometers to microns, and the corresponding relationship among multiple microelements, microstructure of secondary phases, and fatigue life, was established in this spring steel.

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Microstructures' effects on high temperature fatigue failure behavior of typical superalloys

Cited by 21 publications

References 37 publications

Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review

Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review

2D and 3D characterization of oxidation‐fatigue mechanisms in an advanced Ni‐based superalloy: Effects of microstructure and elevated temperature

Thermodynamics Analysis of Multiple Microelements’ Coupling Behavior in High Fatigue Resistance 50CrVA Spring Steel with Nanoparticles

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