Influence of Processing Parameters on Grain Size Evolution of a Forged Superalloy

Reyes, Luis A.; Páramo, P.; Zamarripa, A. Salas; Garza, Maribel de la Garza; Guerrero‐Mata, Martha Patricia

doi:10.1007/s11665-015-1828-z

Cited by 22 publications

(3 citation statements)

References 24 publications

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“…The incoherent δ (

N {normali}_{3} N b

) phase is the equilibrium phase of

γ^{″}

phase, and it exhibit excellent stability below its dissolution temperature . Based on their excellent anti‐oxidation and mechanical performances at high temperatures, nickel‐based superalloys are largely applied in aviation, aerospace, and nuclear industries . In general, nickel‐based superalloys are key materials of the structural components whose service temperature is near or above 700 °C, such as the turbine blades, guide vanes and turbine discs of aviation and industrial gas turbines .…”

Section: Introductionmentioning

confidence: 99%

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

et al. 2017

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Uniaxial creep tensile experiments are performed to study the influences of initial δ phase (Ni 3 Nb) on the creep features and fracture behaviors of a nickel-based superalloy. Experimental results show that the creep features and fracture behaviors of the researched superalloy are closely relevant to the volume fraction of initial δ phase. The minimum creep rate increases with the increased volume fraction of initial δ phase. The appropriate volume fraction of initial δ phase can improve the creep resistance and plasticity. So, the rupture time and the elongation to fracture initially increase, when the volume fraction of initial δ phase is relatively low, and then decrease with the increase of volume fraction of initial δ phase. Additionally, with the increased initial δ phase, the failure mode changes from a typical intergranular fracture to the mixed fracture pattern of ductile intergranular and cleavage fracture.

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“…The incoherent δ (

N {normali}_{3} N b

) phase is the equilibrium phase of

γ^{″}

Section: Introductionmentioning

confidence: 99%

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

et al. 2017

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“…The modified JC flow stress model parameters are obtained from Jafarian et al [27]. The JMAK model parameters are obtained from Huang et al [23], Reyes et al [28], and Loyda [29], as listed in the following tables. The initial grain size d 0 is assumed to be 5.9 μm from microscopic observation.…”

Section: Mathematical Materials Modeling Considering Drxmentioning

confidence: 99%

Numerical predictions of orthogonal cutting–induced residual stress of super alloy Inconel 718 considering dynamic recrystallization

Soufian

Darabi

Abouridouane

et al. 2022

Int J Adv Manuf Technol

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Manufacturing processes, such as machining, can produce residual stresses in products. Residual stress and its distribution can be the main factor influencing the fatigue life of machined components and has already been the subject of many experimental and numerical studies. The high-temperature condition, as a result of machining, makes a change in the microstructural properties of the material and consequently affect the mechanical properties of the workpiece. A major metal component of aircraft structure and engine components is nickel-based alloys due to their resistance to heat, corrosion, thermal fatigue, thermal shock, creep, and erosion. When these critical structural components in the aerospace industry are manufactured with the objective to reach high-reliability levels, surface integrity is one of the most relevant parameters used for evaluating the quality of finish-machined surfaces. The residual stresses and surface alterations including white layer, depth of work hardening, micro-cracks, and oxidation induced by machining of nickel-based alloys are extremely critical due to safety and sustainability concerns. Integrated Computational Materials Engineering (ICME) links physics-based models to predict the performance of materials based on their processing history. The Johnson–Mehl–Avrami-Kolmogrov (JMAK) model is used to develop a microstructure-based modeling approach that takes into account dynamic recrystallization (DRX) that causes grain size changes. Allied with that, a grain size parameter on the flow stress behavior of the material is considered by adding a grain size-dependent term to the traditional Johnson–Cook (JC) model as a novel framework. The impact of the simulation of the orthogonal cutting process is implemented in a finite element method (FEM) model–based commercial software, ABAQUS-explicit, with a coupled Euler-Lagrangian (CEL) approach. By relying on the VUHARD user subroutine capabilities with Fortran language, ABAQUS-explicit can be steered to model the material behavior considering the term of DRX. The forecast capability of the developed model is assessed by comparison of the results by changing the depth of cut and cutting edge radius effect on the residual stress. Then, the correlation between the grain size evolution and temperature distribution by changing the cutting velocity is investigated.

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“…Avrami model parameters are listed in Table 1. These parameters are obtained from both DEFORM default settings and Huang et al [16], Reyes et al [17], and Loyda et al [18].…”

Section: Mechanically and Thermally Induced Recrystallization Modelmentioning

confidence: 99%

Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718

Pan

Feng

et al. 2017

Manufacturing Rev.

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-Inconel 718 is a typical hard-to-machine material that requires thermally enhanced machining technology such as laser-assisted milling. Based upon finite element analysis, this study simulates the forces in the laser-assisted milling process of Inconel 718 considering the effects of grain growth due to c 0 and c 00 phases. The c 00 phase is unstable and becomes the d phase, which is likely to precipitate at a temperature over 750°C. The temperature around the center of spot in the experiments is 850°C, so the phase transformation and grain growth happen throughout the milling process. In the analysis, this study includes the microstructure evolution while accounting for the effects of dynamic recrystallization and grain growth through the Avrami model. The grain growth reduces the yield stress and flow stress, which improves the machinability. In finite element analysis (FEA), several boundary conditions of temperature varying with time are defined to simulate the movement of laser spot, and the constitutive model is described by Johnson-Cook equation. In experiments, this study collects three sets of cutting forces and finds that the predicted values are in close agreements with measurements especially in feed direction, in which the smallest error is around 5%. In another three simulations, this study also examines the effect of laser preheating on the cutting forces by comparison with a traditional milling process without laser assist. When the laser is off, the forces increase in all cases, which prove the softening effect of laser-assisted milling. In addition, when the axial depth of milling increases, the laser has a more significant influence, especially in axial direction, in which the force with laser is more than 18% smaller than the one without laser. Overall, this study validates the influence of laser-assisted milling on Inconel 718 by predicting the cutting forces in FEA.

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Influence of Processing Parameters on Grain Size Evolution of a Forged Superalloy

Cited by 22 publications

References 24 publications

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

Effects of Initial δ Phase on Creep Behaviors and Fracture Characteristics of a Nickel‐Based Superalloy

Numerical predictions of orthogonal cutting–induced residual stress of super alloy Inconel 718 considering dynamic recrystallization

Microstructure-sensitive flow stress modeling for force prediction in laser assisted milling of Inconel 718

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