Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni–Mo–Cr–Fe Base Corrosion-Resistant Superalloy

Liu, Tao; Yang, Mei; Wang, Junsong; Dong, Jianshu; Wang, Li; Lou, Langhong

doi:10.1007/s40195-018-0837-y

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…Yang Liu et al and K D Ramkumar et al [11,12] analyzed interdependency of grain refinement, deleterious phases, residual stress and fatigue properties of IN718 superalloy on processing parameters by warm laser shock processing and multipass gas tungsten arc welding with filler wires. Yan Guo et [13][14][15][16] analyzed correlation between heat treatment, inter-and intra-granular precipitation behavior, grain growth as well as mechanical properties of Ni-based superalloys Inconel 617, K417G and Hastelloy C-276. Jinwen Zou et al and Xu Zhang et al [17,18] analyzed correlation between alloying elements, phase transformation, mechanical properties and ductility-dip cracking of powder metallurgy Ni-based superalloy FGH96.…”

Section: Introductionmentioning

confidence: 99%

Diffusion-limited Nonequilibrium Phase Transformation of Nickel/Aluminum Dissimilar Materials during Laser Welding Part I: Precipitation-strengthened Polycrystalline Nickel-based Superalloy

Gao

2022

J. Phys.: Conf. Ser.

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Polycrystalline heterogeneities of grain growth, phase transformation and tensile properties are discussed by metallography, spectroscopy and fractography when choosing laser welding with butt-joint configuration to satisfactorily minimize effect of inappropriate weld pool shape on microstructure and mechanical properties of γʹʹ precipitation hardable nickel-based superalloy in aerospace industry. There is parabolic relationship between weld penetration and diffusion-limited nucleation, growth and coarseness of secondary dendrite arm spacing alongside fusion boundary through nonequilibrium solidification process, which is dendritically susceptible to grain growth variation and metallurgical discontinuities. The amount, size, morphology and distribution of nonequilibrium intermetallic phase near the dendrite boundaries are kinetically and thermodynamically rely on weld pool shape whose crystal structure is incoherent with γ solid solution austenite phase and increases preference for crack initiation and propagation of brittle intergranular and ductile dimple fracture failures to enormously contribute to losses of strength and ductility. Unsymmetrical keyhole weld is thermometallurgically inconvenient for amelioration of microstructure and mechanical properties on either side, and adversely mitigates resistance to hypereutectic-aided dendrite embrittlement. Beneficial grain refinement and suppression of detrimental nonequilibrium intermetallic phase at the same time are challenging. This problem is an integral part of inhomogeneous microstructure and mechanical properties. The finer grain size occurs, the larger grain boundary area is available for Laves/γ eutectic-type reaction and vice versa. Contributions of coarse grain kinetics and metallurgical reaction thermodynamics to weld disintegration and fracture failure mechanism of tensile properties are explained by microstructure characterization of multicomponent and multiphase weld. Finally, it is imperative to dendritically balance these important factors to minimize inevitable interface solidification products and anomalous substructure growth, and reasonably advance superior mechanical properties of reliable weld.

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Section: Introductionmentioning

confidence: 99%

Diffusion-limited Nonequilibrium Phase Transformation of Nickel/Aluminum Dissimilar Materials during Laser Welding Part I: Precipitation-strengthened Polycrystalline Nickel-based Superalloy

Gao

2022

J. Phys.: Conf. Ser.

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“…Several authors have pointed out that as the alloy's dissolution temperature range for γ phases can be from 968 to 1059 • C in standard chemical composition ranges, it will significantly affect the volume of γ phases with different solution temperature [23][24][25][26]. With increasing Al and Ti content, the dissolution temperature increases while the essential character of change is the difference of key elements, specifically Al and Ti, which contribute to the formation of γ phases.…”

Section: Introductionmentioning

confidence: 99%

Influence and Sensitivity of Temperature and Microstructure on the Fluctuation of Creep Properties in Ni-Base Superalloy

et al. 2020

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In this work, the sensitivity zone of microstructure and temperature for precipitation-strengthened nickel-based superalloys, used for turbine applications in aero-engines, has been firstly established. Heat treatment experiments with different solution temperatures were carried out. The microstructure evolution and creep residual strain sensitivity, low cycle fatigue properties, and tensile properties are analyzed, and the essential reason for the fluctuation of the mechanical properties of nickel-based superalloys was revealed. The main results obtained are as follows: following subsolvus solution heat treatment with a temperature of 1020 °C, samples have a high primary γ′I phase content, which is beneficial to low creep residual strain. Above the supersolvus solution temperature of 1040 °C, the creep residual strain value and low cycle fatigue performance fluctuate significantly. The essential reason for the dramatic fluctuation of performance is the presence of γ′ phases in different sizes and quantities, especially following the solution heat treatment in the temperature-sensitive zone of the γ′I phase, which is likely to cause huge fluctuations in the microstructure of tertiary γ′III phases. A zone of particular sensitivity in terms of temperature and microstructure for the γ′I phase is proposed. The range of suitable solution temperatures are discussed. In order to maintain stable mechanical properties without large fluctuations, the influence of the sensitivity within this temperature and microstructure zone on the γ′ phase should be considered.

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Influence of long-term isothermal aging on microstructure and creep rupture properties of Ni-base superalloy M4706

Duan

Zhang

et al. 2020

J. Cent. South Univ.

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Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni–Mo–Cr–Fe Base Corrosion-Resistant Superalloy

Cited by 6 publications

References 27 publications

Diffusion-limited Nonequilibrium Phase Transformation of Nickel/Aluminum Dissimilar Materials during Laser Welding Part I: Precipitation-strengthened Polycrystalline Nickel-based Superalloy

Diffusion-limited Nonequilibrium Phase Transformation of Nickel/Aluminum Dissimilar Materials during Laser Welding Part I: Precipitation-strengthened Polycrystalline Nickel-based Superalloy

Influence and Sensitivity of Temperature and Microstructure on the Fluctuation of Creep Properties in Ni-Base Superalloy

Influence of long-term isothermal aging on microstructure and creep rupture properties of Ni-base superalloy M4706

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