Acta Metallurgica Sinica (English Letters) ›› 2018, Vol. 31 ›› Issue (12): 1287-1296.DOI: 10.1007/s40195-018-0735-3
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Dong-Wei Ao1, Xing-Rong Chu1, Shu-Xia Lin1, Yang Yang2, Jun Gao1()
Received:
2018-01-03
Revised:
2018-02-06
Online:
2018-12-10
Published:
2018-12-18
Dong-Wei Ao, Xing-Rong Chu, Shu-Xia Lin, Yang Yang, Jun Gao. Hot Tensile Behaviors and Microstructure Evolution of Ti-6Al-4V Titanium Alloy Under Electropulsing[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(12): 1287-1296.
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Al | V | Fe | C | O | N | H | Ti |
---|---|---|---|---|---|---|---|
6.0 | 4.1 | 0.19 | 0.02 | 0.16 | 0.02 | 0.002 | Bal. |
Table 1 Chemical compositions of the Ti6Al4V sheet specimens (wt%)
Al | V | Fe | C | O | N | H | Ti |
---|---|---|---|---|---|---|---|
6.0 | 4.1 | 0.19 | 0.02 | 0.16 | 0.02 | 0.002 | Bal. |
Strain rates (s-1) | Electropulsing parameters | ||||||
---|---|---|---|---|---|---|---|
Voltage (V) | Frequency (Hz) | Duration (μs) | J r (A/mm-2) | J p (A/mm-2) | ti/tp | ||
Group Ι | 0.010 0.005 0.001 | 20 | 150 | 64.0 | 8.1 | 103.9 | 0.0096 |
20 | 250 | 62.8 | 10.0 | 103.9 | 0.0157 | ||
20 | 350 | 63.5 | 11.6 | 103.9 | 0.0222 | ||
20 | 450 | 62.4 | 12.7 | 103.9 | 0.0281 | ||
Group ΙΙ | 0.005 | 28 | 135 | 62.0 | 11.1 | 169.5 | 0.0084 |
30 | 130 | 62.4 | 12.5 | 186.7 | 0.0081 |
Table 2 Experimental parameters
Strain rates (s-1) | Electropulsing parameters | ||||||
---|---|---|---|---|---|---|---|
Voltage (V) | Frequency (Hz) | Duration (μs) | J r (A/mm-2) | J p (A/mm-2) | ti/tp | ||
Group Ι | 0.010 0.005 0.001 | 20 | 150 | 64.0 | 8.1 | 103.9 | 0.0096 |
20 | 250 | 62.8 | 10.0 | 103.9 | 0.0157 | ||
20 | 350 | 63.5 | 11.6 | 103.9 | 0.0222 | ||
20 | 450 | 62.4 | 12.7 | 103.9 | 0.0281 | ||
Group ΙΙ | 0.005 | 28 | 135 | 62.0 | 11.1 | 169.5 | 0.0084 |
30 | 130 | 62.4 | 12.5 | 186.7 | 0.0081 |
Fig. 3 a Temperature field distribution; b temperature evolution of Ti-6Al-4V alloy with 8.1-12.7 A/mm2, 0.005 s-1; c relationship between temperature curve and flow stress-strain curve; d the maximum temperature evolution under RMS current density and strain rates
Fig. 4 Representative stress-strain curves under electropulsing: a Jr?=?0-12.7 A/mm2, Jp?=?103.9 A/mm2, ε?=?0.001 s-1, b Jr?=?12.7 A/mm2, Jp?=?103.9 A/mm2, \(\dot{\varepsilon }\)?=?0.01-0.001 s-1
Fig. 5 a Variation of strain hardening exponent n; b ultimate tensile strength evolution under different RMS current densities and strain rates; c variation of strain rate sensitivity exponent m; d elongation to fracture under different RMS current densities and strain rates
Fig. 6 a Temperature field of specimens with Jp?=?103.9-169.5 A/mm2 at Jr?=?11.1-11.6 A/mm2, Jp?=?103.9-186.7 A/mm2 at Jr?=?12.5-12.7 A/mm2, b representative stress-strain curves corresponding to Fig. 6a, b temperature field
Fig. 8 Optical microstructure images of Ti-6Al-4V alloy under different RMS current densities and strain rates: a 0 A/mm2, 0.001 s-1, b 8.1 A/mm2, 0.001 s-1, c 11.6 A/mm2, 0.001 s-1, d 12.7 A/mm2, 0.001 s-1, e 8.1 A/mm2, 0.01 s-1, f 12.7 A/mm2, 0.01 s-1
Fig. 9 Fracture morphology among a section shrinkage evolution under RMS current density and 0.001 s-1; b without current, 0.001 s-1, c 8.1 A/mm2, 0.001 s-1, d 11.6 A/mm2, 0.001 s-1, e 11.6 A/mm2, 0.005 s-1, f 11.6 A/mm2, 0.01 s-1
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