Effect of initial microstructure and beta phase evolution on dynamic recrystallization behaviour of Ti6Al4V alloy - An EBSD based investigation

Souza, Paul M.; Hodgson, Peter; Rolfe, Bernard; Singh, Rajeev Kumar; Beladi, Hossein

doi:10.1016/j.jallcom.2019.04.183

Cited by 42 publications

(8 citation statements)

References 37 publications

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“…A forged billet of Ti-6Al-4V alloy supplied by TIMET, with 85 mm diameter and nominal chemical compositions of 6.4% Al, 4.0% V, 0.15% Fe, 0.017% C, 0.18% O, 0.005% N (wt%) was used for these investigations. The β transus temperature of a same grade of alloy with similar chemical compositions was reported to be in the range of ~ 995±5 °C [10]. Cylindrical samples with 85 mm diameter (i.e., same as the initial billet) and 85 mm height were cut from the as-received billet using a band saw, and subsequently subjected to β solution treatment at 1020 °C for 2 hours followed by water quenching to room temperature (Fig.…”

Section: Methodsmentioning

confidence: 99%

A novel cyclic thermal treatment for enhanced globularisation kinetics in Ti-6Al-4V alloy: Experimental, constitutive and FE based analyses

Souza

Sivaswamy

Andreu

et al. 2022

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

A novel cyclic thermal treatment for enhanced globularisation kinetics in Ti-6Al-4V alloy: Experimental, constitutive and FE based analyses

Souza

Sivaswamy

Andreu

et al. 2022

Journal of Alloys and Compounds

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“…The formation of necklace structure along the pre-existing grain boundaries is a characteristic of DDRX occurred during the deformation [41]. The extent of fine grain formation along the parent grain boundaries (i.e., through DDRX) depends on the initial grain size, the deformation temperature and strain rate [42]. It can be observed from the EBSD IPF maps that the increase in strain rate has major effect on the number of grain boundaries with fine grains and on the fraction of the necklace structures formed (Fig.…”

Section: Microstructural Characteristics After Hot Compression Testsmentioning

confidence: 99%

An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

et al. 2022

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Inconel 625 nickel alloy with its attractive high-temperature strength, excellent corrosion and oxidation resistance is mainly used for critical applications in demanding environments, in both as-cast and wrought conditions. Hot processing of this alloy is crucial for achieving its tailored mechanical properties due to the significant variation in microstructural changes with varying process parameters like temperature, strain, and strain rate. In this study, isothermal hot compression tests were carried out at temperatures ranging from 900 to 1100 °C, and under strain rates ranging from 0.01 to 1 s−1. The flow curves revealed three stages of deformation, including a substantial work-hardening stage followed by dynamic recovery and flow softening. Microstructural observations showed the occurrence of discontinuous dynamic recrystallisation (DDRX) as the dominant recrystallisation mechanism during the flow softening. Microstructural analysis suggested that the DRX was more sensitive to the test temperature as compared to the strain rate. An innovative material's constitutive model was developed, by combining Johnson–Cook (JC) and Avrami approaches, to predict work-hardening, dynamic recovery, and flow softening stages of deformation. The predicted flow behavior was in a good agreement with the experimentally measured data. The developed material model was integrated into DEFORM® 3D finite element (FE) simulation software as a user subroutine for the prediction of deformation behaviour in a double truncated cone (DTC) sample. Comparison between the experimentally measured data and the results of FE simulation on the DTC sample showed a very good convergence, indicating the suitability of the proposed material’s constitutive model for large scale simulations. Graphical Abstract

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“…Figure 8 shows the comparison between the experimental and predicted data obtained by the constructed model of VT6 alloy (figures 8(a)-(e)) and the correlation between experimental and fitted flow stress ( figure 8(f)). The quality of the constructed model was appraised by using standard statistical quantities equations (14)- (16). The values of R, AARE and RMSE for this alloy were 0.975, 5.7% and 2.8 MPa, respectively.…”

Section: Determination Of Mmentioning

confidence: 99%

“…The predictability of the constructed model was assessed using the same standard statistical quantities which stated in equations (14)- (16). The values of R, AARE and RMSE for this alloy were 0.97, 7.2% and 4.3 MPa, respectively.…”

Section: Model Verificationmentioning

confidence: 99%

“…(1) parameters related to the deformation process such as the deformation temperatures and strain rates [10,13]. (2) parameters related to the microstructure of investigated alloy such as alloy chemistry, grain growth kinetics, grain size distribution, grain aspect ratio, volume fraction of phases and texture [14][15][16][17][18][19][20]. The influence of the both deformation temperature and strain rate on the elongation to failure and strain-hardening coefficient of the VT6, OT4-1 and VT14 alloys was studied in [10].…”

Section: Introductionmentioning

confidence: 99%

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Modelling approach for predicting the superplastic deformation behaviour of titanium alloys with strain hardening/softening characterizations

Mosleh

Mestre-Rinn

Khalil

et al. 2019

Mater. Res. Express

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This paper introduces an approach for modelling the flow behaviour of different titanium alloys (VT6, OT4-1 and VT14 alloys by Russian specifications) in superplastic deformation temperature and strain rate ranges. The initial microstructure parameters (d V , , , a b a b ) before starting the deformation test were included in the constructed model for each alloy. The investigated alloys have different initial microstructures and flow behaviour characteristics. The isothermal uniaxial tensile deformation tests were performed at the superplastic deformation temperature and strain rate ranges of each alloy. The VT6, OT4-1 alloys were characterized by strain hardening effect during the deformation test, while VT14 alloy was characterized by strain softening effect. A comparison study between the experimental and modelled data was performed. The general equation of the constructed models was affected by the flow behaviour of the investigated alloys. The comparison results proved the good capability of the constructed models to predict the flow behaviour of the studied alloys. The correlation coefficient R was 0.98, 0.95 and 0.97 for VT6, OT4-1 and VT14, respectively. The predictability of the constructed model was assessed by the cross-validation technique, which ascertained the quality of the constructed model.

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Effect of initial microstructure and beta phase evolution on dynamic recrystallization behaviour of Ti6Al4V alloy - An EBSD based investigation

Cited by 42 publications

References 37 publications

A novel cyclic thermal treatment for enhanced globularisation kinetics in Ti-6Al-4V alloy: Experimental, constitutive and FE based analyses

A novel cyclic thermal treatment for enhanced globularisation kinetics in Ti-6Al-4V alloy: Experimental, constitutive and FE based analyses

An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

Modelling approach for predicting the superplastic deformation behaviour of titanium alloys with strain hardening/softening characterizations

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