Friction and Heat Transfer Coefficient Determination of Titanium Alloys during Hot Forging Conditions

Sethy, Ritanjali; Galdos, Lander; Mendiguren, Joseba; Argandoña, Eneko Sáenz de

doi:10.1002/adem.201600060

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…In a relative recent work, Kalpin et al [17] have developed a three-punch method for estimating the friction at the work-die interface, but this method can be treated as a direct method. Recently, Sethy et al [18] have determined heat transfer coefficient and friction factor in a hot ring compression test. For inverse determination of friction factor, the basis was the minimization of the error between FEM simulated and experimental inner diameter.…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

Determining Friction and Flow Stress of Material during Forging

Dixit¹,

Kumar²,

Петров³

et al. 2021

Esaform 2021

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Determination of flow stress and friction in cold forging is of paramount importance. In this work, an inverse procedure is developed for predicting the Coulomb’s coefficient of friction and strain-dependent flow stress simultaneously based on the measurement of bulge and forging load. It is also established that in cold forging Coulomb’s coefficient of friction can be approximated as half the friction factor in Tresca (or constant friction) model. In the inverse procedure, forging load is estimated analytically but bulging is estimated by developing an empirical relation. The efficacy of the inverse procedure is ascertained by the data obtained from finite element method simulations. Finite element method was implemented in ABAQUS and validated with the results available in literature. In most of the cases, inverse procedure provides less than 5% error in the estimates of friction and flow stress. A sensitivity analysis is also carried out to study the effect of measurement error. It is observed that error in the estimation of friction is proportional to error in the measurement of bulge. The novelty of the method lies in the quickness and simplicity of the method.

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Section: Intr Introduction Oductionmentioning

confidence: 99%

Determining Friction and Flow Stress of Material during Forging

Dixit¹,

Kumar²,

Петров³

et al. 2021

Esaform 2021

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show abstract

“…Gas pressure was applied to the upper surface of the sample. In this work, the friction coefficient between the contact interfaces of the specimen and the dies was selected as for hot forging dry (0.7) according to [49][50][51]. The forming processes at different constant uniform gas pressure of 4, 7, 10 bar for 600 sec were performed.…”

Section: Materials and Experimental Testmentioning

confidence: 99%

Microstructure Evolution of Ti-Al-Mo-V Titanium Alloy During the Superplastic Forming with FES Estimated Strain Rates Across the Formed Parts at Constant Gas Pressure

Mosleh

Котов

Медведева

et al. 2020

SSP

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This paper studies the influence of the strain rate during the superplastic forming on the microstructure evolution of Ti-4Al-3Mo-1V titanium alloy. The finite elements simulation (FES) of the superplastic forming process at a temperature of 875 °C, which considered to be the optimum forming temperature of this alloy, and at a constant uniform gas pressure of 0.4, 0.7, and 1 MPa were performed. The strain rate response across the formed part via FES at each applied gas pressure was analyzed. The superplastic forming using the same forming condition of the FES, applied gas pressure and forming time, was performed via lab forming machine. In initial state before forming, the studied alloy exhibits a mixture of lamellar and equiaxed grain structure. The microstructure evolution after the superplastic forming process for each applied gas pressure was investigated. It was observed that the lamellar microstructure significantly affects the superplastic forming process and the uniformity of the thickness profile after forming.

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Characterization of the heat transfer coefficient at near solidus forming condition using columnar pressing test

Sajjad,

Agirre,

Plata

et al. 2024

Int J Adv Manuf Technol

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This study addresses the significant gap in the literature regarding the heat transfer coefficient (HTC) under near-solidus forming (NSF) conditions, where materials are shaped close to their solidus state, presenting complex behaviour compared to traditional hot forming processes. Despite the pivotal role of heat transfer in developing a reliable material model for the digital twin (DT), limited data exist particularly regarding HTC characterization at NSF. Additionally, testing methodologies suitable for the high-temperature conditions, crucial for NSF processes, have not been adequately addressed. To fill this gap, this study aims to characterize HTC under NSF conditions using a columnar pressing test. The test was conducted at three different temperatures such as 1250, 1300, and 1360 °C and two different pressures, 2 and 8 MPa. During the test, temperature data was collected at the centre of the sample using a k-type thermocouple. Furthermore, the DT of the pressing test was developed and the three-dimensional finite element model of 42CrMo4 steel was constructed using FORGE NxT® 4.0 FEM software. The simulations were performed with varying HTC values to replicate the experimental test data. Inverse modelling techniques were then applied to compare experimental and simulated data, enabling the characterization and optimization of HTC values under NSF testing conditions. The results demonstrated that HTC in the NSF process is primary impacted by the forming pressure, whereas temperature change showed no variation at the studied ranges. The HTC value of 500 W/m2K and 800 W/m2K was identified at 2 MPa and 8 MPa, respectively. The conclusion of this study aims for a better understanding of heat transfer phenomena in NSF processes, enhancing the reliability of DT for industrial applications.

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Friction and Heat Transfer Coefficient Determination of Titanium Alloys during Hot Forging Conditions

Cited by 7 publications

References 23 publications

Determining Friction and Flow Stress of Material during Forging

Determining Friction and Flow Stress of Material during Forging

Microstructure Evolution of Ti-Al-Mo-V Titanium Alloy During the Superplastic Forming with FES Estimated Strain Rates Across the Formed Parts at Constant Gas Pressure

Characterization of the heat transfer coefficient at near solidus forming condition using columnar pressing test

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