Hot workability and microstructure evolution of the nickel-based superalloy Inconel 718 produced by laser metal deposition

Bambach�, Markus; Sizova, Irina; Silze, Frank; Schnick, Michael

doi:10.1016/j.jallcom.2018.01.029

Cited by 78 publications

(16 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A reduction of porosity was obtained by high deformation rates and a high degree of deformation, which also leads to higher fatigue strength. Previous work of Bambach and Sizova [10] focused on the forming of AM-preforms made of Ti6Al4V and Inconel 718 [11]. A good formability of both materials was observed in the 3D printed state, with lower activation energy for hot forming.…”

Section: Introductionmentioning

confidence: 95%

Investigation of microstructure and hardness of a rib geometry produced by metal forming and wire-arc additive manufacturing

et al. 2018

Self Cite

View full text Add to dashboard Cite

Within the scope of consumer-oriented production, individuality and cost-effectiveness are two essential aspects, which can barely be met by traditional manufacturing technologies. Conventional metal forming techniques are suitable for large batch sizes. If variants or individualized components have to be formed, the unit costs rise due to the inevitable tooling costs. For such applications, additive manufacturing (AM) processes, which do not require tooling, are more suitable. Due to the low production rates and limited build space of AM machines, the manufacturing costs are highly dependent on part size and batch size. Hence, a combination of both manufacturing technologies i.e. conventional metal forming and additive manufacturing seems expedient for a number of applications. The current study develops a process chain combining forming and additive manufacturing. First, a semi-finished product is formed with forming tools of reduced complexity and then finished by additive manufacturing. This research investigates the addition of features using AlSi12 created by Wire Arc Additive Manufacturing (WAAM) on formed EN-AW 6082 preforms. By forming, the strength of the material was increased, while this effect was partly reduced by the heat input of the WAAM process.

show abstract

Section: Introductionmentioning

confidence: 95%

Investigation of microstructure and hardness of a rib geometry produced by metal forming and wire-arc additive manufacturing

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Graphite flakes were added between the end face of sample and anvil to reduce friction. The softening effect caused by thermal effect during deformation can be calculated by formula ∆ = − , where Q is an activation energy, R is the gas constant (8.314 J/(mol•K), ΔT is measured by thermocouple, and n, α are material parameters, which are later presented in Equation (7). There is one sample for each experimental condition, and only one sample is added when the experimental results are obviously abnormal.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…It is concluded that NRA has limited effect on that of the accuracy SCAM model. This is because each of the test data was also used when TLRM and NRA were used to solve the four parameters in Equation (7). Therefore, the NRA had less influence on the SCAM results than it did on the J-C model.…”

Section: Evaluation Of the Phenomenological Modelsmentioning

confidence: 99%

“…Zhao et al described the strain rate softening behavior of FeCr alloy manufactured by laser additive manufacturing, and found that the modified Johnson-Cook model took into account the coupling effect of influencing factors, so the prediction accuracy was higher than that of the original model [6]. Bambach et al [7] investigated the deformation behavior of Inconel 718 manufactured by laser metal deposition, and found additive manufactured alloys show similar stress levels compared with conventional materials. Bambach et al [8] found that additive manufactured Ti6Al4V alloys had lower deformation activation energy and peak stress than conventional materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phenomenological Constitutive Models for Hot Deformation Behavior of Ti6Al4V Alloy Manufactured by Directed Energy Deposition Laser

Niu

Sun

Wang

et al. 2020

Metals

View full text Add to dashboard Cite

This work focuses on the hot deformation behavior and constitutive models of Ti6Al4V alloy manufactured by directed energy deposition laser (DEDL). The hot compression tests of DEDL Ti6Al4V alloy at deformation temperature of 700–950 °C and strain rate range of 0.001–1 s−1 were carried out. Three phenomenological models including modified Johnson–Cook model, modified Fields–Backofen model, and strain-compensated Arrhenius model were introduced to predict the flow stresses during uniaxial compression. The predictability of the three models is evaluated according to correlation coefficient, average absolute relative error, and average root mean square error. Traditional linear regression method (TLRM) and nonlinear regression analysis (NRA) were used to solve the constants of modified Johnson–Cook model and strain-compensated Arrhenius model, NRA was used to solve the constants of modified Fields–Backofen model. Compared with the TLRM, the NRA improves the accuracy of modified Johnson-Cook model, while has limited effect on that of strain-compensated Arrhenius model. The accuracy of modified Fields–Backofen model and strain-compensated Arrhenius model is higher than that of modified Johnson–Cook model.

show abstract

“…The use of superalloys is particularly dominant in aerospace engines and various industrial gas turbines. [1][2][3][4][5][6] However, the working conditions of Ni-Cr-Fe superalloys that have a working temperature of 800 C or higher are extremely demanding. The amount of water vapor in the exhaust gas reaches 20%, which accelerates the corrosion of the material; in addition, high-frequency cyclic stress results in fatigue damage and eventually material breakage.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

et al. 2020

View full text Add to dashboard Cite

The influences of the size and shape of the γ 0 phase and the type and distribution of carbides on the fracture behavior of a new Ni-Cr-Fe superalloy subjected to four different solution aging treatments are examined. The γ 0 phase and γ matrix of the L1 2-ordered structure maintain a coherent orientation relationship on the {100} and {110} atomic planes according to transmission electron microscopy observations. The material becomes stronger because the movement of dislocations is hindered by the γ 0 phase and MC (Nb-rich, Ti-rich) and M 23 C 6 (Cr-rich, Mo-rich) carbides. The two-stage aging system (850 C Â 4 h þ 730 C Â 4 h) substantially increases the size of the γ 0 phase. The solid solution sample shows a microporous-aggregated ductile fracture, and the solution-aged samples show a microporous-aggregated crystalline fracture according to scanning electron microscopy observations. The fracture mechanism is also discussed.

show abstract

Hot workability and microstructure evolution of the nickel-based superalloy Inconel 718 produced by laser metal deposition

Cited by 78 publications

References 29 publications

Investigation of microstructure and hardness of a rib geometry produced by metal forming and wire-arc additive manufacturing

Investigation of microstructure and hardness of a rib geometry produced by metal forming and wire-arc additive manufacturing

Phenomenological Constitutive Models for Hot Deformation Behavior of Ti6Al4V Alloy Manufactured by Directed Energy Deposition Laser

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

Contact Info

Product

Resources

About