Effect of microstructure on hot tensile deformation behavior of 7075 alloy sheet fabricated by twin roll casting

Wang, Lei; Yu, Huashun; Lee, Yun‐Soo; Kim, Minseok; Kim, Su-Hyeon

doi:10.1016/j.msea.2015.11.079

Cited by 27 publications

(14 citation statements)

References 21 publications

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“…Recently, Pardoen and Hutchinson [9], Benzerga [11], and Gao and Kim [12] demonstrated that the Gologanu-Leblond-Devaux model showed significantly improved accuracy in its description of void growth and the corresponding material behavior during ductile fracture. In addition, similar relationships between material fracture and thermal processing parameters have been reported for EH36 alloys [13], Ni-based superalloys [14], Al-7.0%Si-0.3%Mg foundry Al alloys [15], and other alloys [16,17]. ese successful studies have demonstrated that thermotensile tests are important in understanding metal thermoforming and are powerful tools that can guide thermal processing.…”

Section: Introductionsupporting

confidence: 59%

Influence of Strain and Stress Triaxiality on the Fracture Behavior of GB 35CrMo Steel during Hot Tensile Testing

Zhou

Wang

2018

Advances in Materials Science and Engineering

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To better understand cavitation nucleation and crack initiation in 35CrMo steel during high-temperature tensile processing and the effect of stress triaxiality on its fracture behaviors, uniaxial and notch high-temperature tensile tests were performed. The microstructure, fracture morphology, fracture strain, and stress triaxiality of the tested 35CrMo steel were then characterized and discussed. The results showed that crack formation in 35CrMo steel included stages of nucleation, growth, and microcavity aggregation. Scanning electron microscopy and energy-dispersive X-ray spectroscopy demonstrated that crack formation was closely related to the presence of steel inclusions. High-temperature tensile testing of samples with different notch radii showed that the fracture strain of 35CrMo steel was decreased with increasing stress triaxiality, that is, increased stress levels corresponded to decreased material plasticity. In addition, the recrystallization degree was decreased with increased stress triaxiality, and the grain size growth was slowed. The failure of 35CrMo steel occurred via ductile fracture, and low stress triaxiality, and high temperature conditions induced large and deep dimples on the fracture surface.

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Section: Introductionsupporting

confidence: 59%

Influence of Strain and Stress Triaxiality on the Fracture Behavior of GB 35CrMo Steel during Hot Tensile Testing

Zhou

Wang

2018

Advances in Materials Science and Engineering

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“…A modified Oyane-Sato fracture criterion was proposed and applied to the cross wedge rolling process of the AA6082-T6 bars by Novella et al who performed hot tensile tests at elevated temperatures [8]. The effects of the microstructure on hot tensile deformation behavior of 7075 alloy was evaluated by Wang and his co-workers [9]. Further, a similar dependence of the fracture behavior on the deformation conditions was reported for the IMI834 titanium alloy [10], TA15 Ti alloy [11], Mg-9.3Li-1.79Al-1.61Zn alloy [12], and other alloys [13,14], all of which indicate that hot tensile tests are a powerful tool to investigate the fracture and high-temperature behavior of alloys.…”

Section: Methodsmentioning

confidence: 99%

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Xiao

Huang

Liu

et al. 2016

Metals

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Abstract:To better understand the tensile deformation and fracture behavior of 35CrMo steel during hot processing, uniaxial tensile tests at elevated temperatures and strain rates were performed. Effects of deformation condition on the flow behavior, strain rate sensitivity, microstructure transformation, and fracture characteristic were characterized and discussed. The results indicated that the flow stress was sensitive to the deformation condition, and fracture occurs immediately after the peak stress level is reached, especially when the temperature is low or the strain rate is high. The strain rate sensitivity increases with the deformation temperature, which indicates that formability could improve at high temperatures. Photographs showing both the fracture surfaces and the matrix near the fracture section indicated the ductile nature of the material. However, the fracture mechanisms varied according to the deformation condition, which influences the dynamic recrystallization (DRX) condition, and the DRX was accompanied by the formation of voids. For samples deformed at high temperatures or low strain rates, coalescence of numerous voids formed in the recrystallized grains is responsible for fracture, while at high strain rates or low temperatures, the grains rupture mainly by splitting because of cracks formed around the inclusions.

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“…According to Wang [10], the relatively high fraction of particles over 1 μm in TRC sheet would result in a homogeneous recrystallized microstructure with fine grains induced by particle simulated nucleation (PSN). It can be thus speculated that the 0.75 m/min sheet would have a more homogeneous and refined structure after hot rolling because of the more uniformly distributed phases in it.…”

Section: Discussionmentioning

confidence: 99%

“…Several researches on 7075 sheet produced by TRC have been carried out recently. Wang et al [10] studied the effects of microstructure of TRC 7075 sheet on its hot tensile behavior and found that large elongation over 200 % was obtained at 450 °C under high strain rate of 1×10 -1 s -1 . This large elongation was caused by the uniformly distributed small particles in TRC sheet casted at high solidification rate, which induced homogeneous recrystallized microstructure during the hot deformation.…”

Section: Introductionmentioning

confidence: 99%

Improvement of microstructure and properties in twin-roll casting 7075 sheet by lower casting speed and compound field

Chen

Yin

et al. 2017

Materials Characterization

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Well-developed dendrites and severe macro and micro segregations in 7075 sheet produced by horizontal twin-roll casting (TRC) deteriorates the hot-workability and properties of the sheet, which makes an obstacle for the successful use of this technology. In this paper, lower casting speed and a pulsed electric-magnetostatic compound field are used to refine microstructure and abate segregation in TRC 7075 sheet. The dendrite arm space decreases from 20 ¿m to 8¿13 ¿m and the micro-segregation degree of Mg, Zn and Cu decreases when casting speed decreases from 1.5 m/min to 0.75 m/min. The center macro-segregation belt disappears in the 0.75 m/min sheet. The as-cast structure and the dendritic segregation in the 0.75 m/min sheet are further refined and abated respectively by the compound field. The secondary dendrite arm size decreases to 5¿8 ¿m in the field sheet. The 0.75 m/min sheet casted with the field shows better mechanical properties after homogenization and hot rolling. The optimization mechanism of lower casting speed and the field was discussed with the aid of classical solidification theory and electromagnetism.

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Effect of microstructure on hot tensile deformation behavior of 7075 alloy sheet fabricated by twin roll casting

Cited by 27 publications

References 21 publications

Influence of Strain and Stress Triaxiality on the Fracture Behavior of GB 35CrMo Steel during Hot Tensile Testing

Influence of Strain and Stress Triaxiality on the Fracture Behavior of GB 35CrMo Steel during Hot Tensile Testing

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Improvement of microstructure and properties in twin-roll casting 7075 sheet by lower casting speed and compound field

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