Forming and fracture limits of IN718 alloy at elevated temperatures: Experimental and theoretical investigation

Mahalle, Gauri; Morchhale, Ayush; Kotkunde, Nitin; Gupta, Amit Kumar; Singh, Swadesh Kumar; Lin, Y.C.

doi:10.1016/j.jmapro.2020.04.070

Cited by 45 publications

(12 citation statements)

References 31 publications

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Section: Resultsmentioning

confidence: 99%

“…This sudden failure might be due to presence of large quantity of γ′ or γ″ phases in IN718. 29 In Figure 9(a), the higher limiting strains has been observed with the minor and major strain values of (−0.158, 0.415) and (0.226, 0.384) in the tension-compression to biaxial tension strain regions of FLD. For a particular strain path, an average value of strain ratio ( α = ε 2 ε 1 ) from experimental points on FLC is considered.…”

Section: Forming and Fracture Forming Limit Diagrammentioning

confidence: 86%

“…Then transferred into corresponding true strains (e 1 and e 2 ). The detailed selection of geometry specimens and measurement of minor and the major surface strain values are reported in the previous studies by Mahalle et al 29,30 Cylindrical deep-drawing test…”

Section: Stretch Forming Testmentioning

confidence: 99%

“…For accurate measure strain values at onset of fracture, by volume constancy expression, as suggested. 29 It is expressed as equation ( 16),…”

Section: Forming and Fracture Forming Limit Diagrammentioning

confidence: 99%

“…As estimated FLD will not signifying an accurate necking limits for lower temperatures, and thus the fracture-based forming limit diagram is considered. For each strain path, multiple fracture strains at onset of fracture were estimated as per procedure reported by Mahalle et al 29,30 Also, Figure 20(a) and (b) gives the complete formability behavior of Inconel alloy by differentiating the necking, fracture and wrinkling. Right side that is in the biaxial tension region is safer compared to left side that is tension-compression region as only necking and fracture failure are observed.…”

Section: Complete Formability Behavior Of Inconel 718 Alloymentioning

confidence: 99%

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An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures

Mahalle

Kotkunde

Gupta

et al. 2021

The Journal of Strain Analysis for Engineering Design

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Wrinkling is generally induced because of metal instability and considered as an undesirable defect in sheet metal forming processes. Wrinkling leads to severe influence on functional requirements and aesthetic appeal of final component. Thus, the present research is mainly dedicated on the experimental and numerical analysis for wrinkling behavior prediction of Inconel 718 alloy at elevated temperature conditions. Initially, Yoshida buckling tests (YBT) have been conducted to investigate wrinkling tendencies of Inconel 718 alloy from room temperature (RT) to 600°C by an interval of 200°C. Subsequently, Finite Element (FE) analysis of YBT has been performed to analyze post buckling behavior. Critical strain values at onset of wrinkling are determined and strain based wrinkling limit curves (ε-WLCs) are plotted at different temperatures. In-plane principal strains are transferred to effective plastic strain (EPS) versus triaxiality (η) space to differentiate the transformation between safe and wrinkling instability. Finally, complete forming behavior of alloy is represented by means of fracture, forming, and wrinkling limit curves. The gap between forming and wrinkling limit curves at elevated temperature is ∼1.5 times higher than that at room temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Forming and Fracture Forming Limit Diagrammentioning

confidence: 86%

Section: Stretch Forming Testmentioning

confidence: 99%

“…For accurate measure strain values at onset of fracture, by volume constancy expression, as suggested. 29 It is expressed as equation ( 16),…”

Section: Forming and Fracture Forming Limit Diagrammentioning

confidence: 99%

Section: Complete Formability Behavior Of Inconel 718 Alloymentioning

confidence: 99%

See 3 more Smart Citations

An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures

Mahalle

Kotkunde

Gupta

et al. 2021

The Journal of Strain Analysis for Engineering Design

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A Theoretical Model for Predicting the Ultimate Strength of Superalloys in a Wide Temperature Range

Yang

et al. 2022

Adv Eng Mater

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Nickel‐based superalloys are often serviced as high‐temperature‐resistant materials. Strength prediction at elevated temperatures is the fundamental issue of equipment performance evaluation in service environment. Herein, the quantitative effect of temperature on the ultimate tensile strength (UTS) of nickel‐based superalloys is investigated. A theoretical model for predicting the temperature‐dependent UTS of nickel‐based superalloys is developed from an energy equivalence perspective. A quantitative relationship is established between UTS and temperature. The model can predict the UTS at different temperatures only using the tensile test data at room temperature and the melting point temperature of the material. Theoretical predictions agree well with nine nickel‐based superalloys experimental data over a wide temperature range. In addition, iron‐based and cobalt‐based superalloys are verified using the proposed model. The significance and applicability scope of the model is also discussed. Research results provide a new alternative approach for predicting the temperature‐dependent UTS of superalloys under service conditions.

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Forming Limits Prediction of Laminated SUS430/Al1050/SUS430 Composites and the Effect of Component Properties on Mechanical Performance

Li,

Liu,

Zhang

2024

Adv Eng Mater

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In this study, a constitutive model applied to predict the tensile properties and fracture behavior of well‐bonded multilayered metal composites is extended. The equivalent single‐layer model, as a convenient method, is introduced into finite‐element simulations by combining it with an improved Xue–Wierzbicki damage plasticity model that considers material anisotropy. The steel use stainless (SUS) 430/Al1050/SUS430 laminated sheet fabricated by cold rolling is selected as the research material. The quasistatic uniaxial tests and Nakazima tests are operated to verify the accuracy of the proposed method. The mean errors in tensile stress and fracture forming limit strains are 2% and 3%, respectively. A load‐sharing mixture rule is proposed to assess the effects of the volume fraction, strength coefficient, and hardening exponent of the constituent materials on the mechanical properties of the laminates. In the results, it is indicated that the laminate exhibits sufficient elongation and remains markedly enhanced in tensile strength, reaching 470 Mpa when the ductile Al layer is combined with the higher strength and hardenability steel layer. In this research, it is aimed to clarify the formability characteristics in laminated composites for optimal sheet configuration design and development.

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Forming and fracture limits of IN718 alloy at elevated temperatures: Experimental and theoretical investigation

Cited by 45 publications

References 31 publications

An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures

An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures

A Theoretical Model for Predicting the Ultimate Strength of Superalloys in a Wide Temperature Range

Forming Limits Prediction of Laminated SUS430/Al1050/SUS430 Composites and the Effect of Component Properties on Mechanical Performance

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