Constitutive analysis of hot forming process of P91 steel: finite element method approach

Mwema, Fredrick Madaraka; Obiko, Japheth; Mahamood, Rasheedat M.; Adediran, A. A.; Bodunrin, Michael Oluwatosin; Akinlabi, Esther Titilayo; Jen, Tien Chien

doi:10.1080/2374068x.2021.1939560

Cited by 8 publications

(9 citation statements)

References 36 publications

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“…The R-value obtained for both materials indicated a good correlation and a higher ability of the models to predict flow stress. These values compare well with the reports of other authors, such as Mwema et al [55] and Samantaray et al [22], with an R-value of 0.994.…”

Section: Verification Of Constitutive Modelssupporting

confidence: 92%

“…Reports by other authors indicated marginally lower AARE findings for hot deformation of P91. Mwema et al [55] obtained an AARE of 2.999%, and Samantaray et al [22] had 5.27%. These variations are due to the differences in hot deformation parameters in the respective studies.…”

Section: Verification Of Constitutive Modelsmentioning

confidence: 97%

“…Pearson's correlation coefficient, R, is liable to bias towards greater or lower values, hence resulting in misrepresenting the accuracy of the model to predict flow stresses [55]. Using the Average Absolute Relative Error (AARE) complements Pearson's correlation method and is less subject to bias [56].…”

Section: Verification Of Constitutive Modelsmentioning

confidence: 99%

“…These variations are due to the differences in hot deformation parameters in the respective studies. The study by Mwema et al [55] was for hot deformation temperature between 900 °C and 1200 °C and strain rate of 1s -1 , 5s -1 , 10s -1 and 15s -1 . In Samantaray et al [22], the temperature for hot deformation was between 850 °C and 1100 °C and strain rates of 0.001s -1 , 0.1s -1 and 100s -1 .…”

Section: Verification Of Constitutive Modelsmentioning

confidence: 99%

See 3 more Smart Citations

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Maube¹,

Obiko²,

Merwe³

et al. 2023

Preprint

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This article reports on the comparative study of the hot deformation behaviour of virgin (steel A) and rejuvenated heat treatment creep-exhausted (steel B) P91 steels. Hot uniaxial compression tests were conducted on the two steels at the deformation temperature range of 900°C-1050°C and a strain rate range of 0.01-10s-1 to 0.6 strain using Gleeble® 3500 equipment. The results showed that the flow stress largely depends on the deformation conditions. The flow stress for the two steels increased with an increase in strain rate at a given deformation temperature and vice versa. The flow stress-strain curves exhibited a dynamic recovery as the softening mechanism. The material constants determined using Arrhenius constitutive equations were: stress exponent was: steel A (5.76) and steel B (6.67), and the apparent activation energy was: steel A (473.1 kJ mol-1) and steel B (564.5 kJmol-1). From these results, steel A exhibited better workability than steel B. Statistical parameters analyses showed that the flow stress for the two steels had a good correlation between the experimental and predicted data. Pearson’s correlation coefficient (R) was: steel A (0.97) and steel B (0.98). The Average Absolute Relative Error (AARE) values were: 7.62% (steel A) and 6.54% (steel B). The study shows that the Arrhenius equations can effectively describe the flow stress behaviour of P91 steel, and this method is applicable to the industrial metalworking process.

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Section: Verification Of Constitutive Modelssupporting

confidence: 92%

Section: Verification Of Constitutive Modelsmentioning

confidence: 97%

Section: Verification Of Constitutive Modelsmentioning

confidence: 99%

Section: Verification Of Constitutive Modelsmentioning

confidence: 99%

See 2 more Smart Citations

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Maube¹,

Obiko²,

Merwe³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…From materials constants and activation energy, Equations ( 15) and ( 16) [61] are the constitutive models used to predict the flow stress behaviour of steel A and steel B, respectively. .…”

Section: Constitutive Model Of Flow Stressesmentioning

confidence: 99%

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

et al. 2023

View full text Add to dashboard Cite

This article reports on the comparative study of the hot deformation behaviour of virgin (steel A) and rejuvenated heat treatment creep-exhausted (steel B) P91 steels. Hot uniaxial compression tests were conducted on the two steels at a deformation temperature range of 900–1050 °C and a strain rate range of 0.01–10 s−1 to a total strain of 0.6 using Gleeble® 3500 equipment. The results showed that the flow stress largely depends on the deformation conditions. The flow stress for the two steels increased with an increase in strain rate at a given deformation temperature and vice versa. The flow stress–strain curves exhibited dynamic recovery as the softening mechanism. The material constants determined using Arrhenius constitutive equations were: the stress exponent, which was 5.76 for steel A and 6.67 for steel B; and the apparent activation energy, which was: 473.1 kJ mol−1 for steel A and 564.5 kJmol−1 for steel B. From these results, steel A exhibited better workability than steel B. Statistical parameters analyses showed that the flow stress for the two steels had a good correlation between the experimental and predicted data. Pearson’s correlation coefficient (R) was 0.97 for steel A and 0.98 for steel B. The average absolute relative error (AARE) values were 7.62% for steel A and 6.54% for steel B. This study shows that the Arrhenius equations can effectively describe the flow stress behaviour of P91 steel, and this method is applicable for industrial metalworking process.

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Constitutive analysis of hot metal flow behavior of virgin and rejuvenated heat treatment creep exhausted power plant X20 steel

Maube,

Obiko,

Van der Merwe

et al. 2024

Int J Adv Manuf Technol

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This paper presents constitutive equations that describe the hot ow behaviour of Virgin (VG) X20 and rejuvenated heat-treated creep exhaust (CE) X20 steels. The study provides a foundation for determining the effect of rejuvenation heat treatment on CE steels by making comparisons to the VG steel. Hot compression tests in the temperature range of 900°C to 1050°C, strain rate range of 0.1-10 s − 1 to a total strain of 0.6 and stress-strain curves were obtained. The ow stress curves of both steels exhibited dynamic recovery (DRV) characteristics as the main softening mechanism. Constitutive constants of steady-state stresses were determined. The stress exponents, n, were 6.62 (VG) and 5.58 (CE), and the apparent activation energy values were 380.36 kJmol − 1 (VG) and 435.70 kJmol − 1 (CE). Analysis of the activation energies showed that VG steel had better workability properties than CE steel and was easier to deform at high temperatures. Constitutive equations for predicting the ow stress in the two steels were established. This were veri ed by statistical tools: Pearson's correlation coe cient (R) and Absolute Average Relative Error (AARE). The results showed R-values were, 0.98 (VG) and 0.99 (CE), and the AARE value for VG was 4.17% and 9.01% for CE. The statistical parameters indicated a good correlation between the experimental and predicted values. The constitutive equations therefore adequately described the ow stress behaviour of both steels and can therefore e ciently analyse industrial metal forming schedules.

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Constitutive analysis of hot forming process of P91 steel: finite element method approach

Cited by 8 publications

References 36 publications

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Comparative Study on Hot Metal Flow Behaviour of Virgin and Rejuvenated Heat Treatment Creep Exhausted P91 Steel

Constitutive analysis of hot metal flow behavior of virgin and rejuvenated heat treatment creep exhausted power plant X20 steel

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