Abstract:The hot deformation behaviour and processing maps of a typical Fe-Mn-Si-Cr steel for automotive body structures were investigated on a Gleeble3500 simulation tester by isothermal compression test in the temperature ranging of 950°C to 1150°C and a strain rate of 0.05-10 s −1 . The results show that dynamic recrystallisation softening mechanism is more evident at low strain rate, while dynamic recovery is more evident at high strain rate. The instability parameter ξ(1) values are negative and considered as unsa… Show more
“…This is because the time of deformation at high strain rates is too short to support the microstructural changes required for DRV or DRX. Hence at higher strain rates, the peak of flow curve is shifted to larger strains, where microstructure is evolved enough to bear DRX [1,13,14]. Figure 3. The microstructure of hot compression specimens from the H10 steel at temperature of 1000°C and strain rates of (a) 0.01 s −1 , (b) 0.…”
Section: Resultsmentioning
confidence: 99%
“…This is because the time of deformation at high strain rates is too short to support the microstructural changes required for DRV or DRX. Hence at higher strain rates, the peak of flow curve is shifted to larger strains, where microstructure is evolved enough to bear DRX [1,13,14].…”
Section: Flow Curves and Characteristic Pointsmentioning
confidence: 99%
“…In high alloy steels, workability is limited and the mechanism of DRX becomes more complicated and highly dependent on the processing variables. These characteristics have obliged researchers to study the hot deformation behaviour of each tool steel separately [13,14].…”
The compression deformation behavior of AISI H10 (DIN 32CrMoV12-28) hot work tool steel was investigated at temperatures ranging from 900°C to 1200°C and strain rates from 0.01 to 1 s −1 . True stress-strain curves showed that a decrease in strain rate or increase in deformation temperature can promote the occurrence of DRX. It was found that the characteristic strains and stresses decrease with an increase in temperature or decrease in strain rate. The σc/σp ratio takes an average of 0.94; and the εc/εp ratio lies in range of 0.48-0.65 (average of 0.53). This suggests that DRV in H10 is not extensive and DRX starts at strains about half of the peak strain. However, the extensive softening by DRX keeps σp close to σc. Using the hyperbolic-sine constitutive equation, the deformation activation energy was calculated to be about 435.76 kJ mol −1 .
“…This is because the time of deformation at high strain rates is too short to support the microstructural changes required for DRV or DRX. Hence at higher strain rates, the peak of flow curve is shifted to larger strains, where microstructure is evolved enough to bear DRX [1,13,14]. Figure 3. The microstructure of hot compression specimens from the H10 steel at temperature of 1000°C and strain rates of (a) 0.01 s −1 , (b) 0.…”
Section: Resultsmentioning
confidence: 99%
“…This is because the time of deformation at high strain rates is too short to support the microstructural changes required for DRV or DRX. Hence at higher strain rates, the peak of flow curve is shifted to larger strains, where microstructure is evolved enough to bear DRX [1,13,14].…”
Section: Flow Curves and Characteristic Pointsmentioning
confidence: 99%
“…In high alloy steels, workability is limited and the mechanism of DRX becomes more complicated and highly dependent on the processing variables. These characteristics have obliged researchers to study the hot deformation behaviour of each tool steel separately [13,14].…”
The compression deformation behavior of AISI H10 (DIN 32CrMoV12-28) hot work tool steel was investigated at temperatures ranging from 900°C to 1200°C and strain rates from 0.01 to 1 s −1 . True stress-strain curves showed that a decrease in strain rate or increase in deformation temperature can promote the occurrence of DRX. It was found that the characteristic strains and stresses decrease with an increase in temperature or decrease in strain rate. The σc/σp ratio takes an average of 0.94; and the εc/εp ratio lies in range of 0.48-0.65 (average of 0.53). This suggests that DRV in H10 is not extensive and DRX starts at strains about half of the peak strain. However, the extensive softening by DRX keeps σp close to σc. Using the hyperbolic-sine constitutive equation, the deformation activation energy was calculated to be about 435.76 kJ mol −1 .
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