Acta Metallurgica Sinica (English Letters) ›› 2014, Vol. 27 ›› Issue (3): 457-463.DOI: 10.1007/s40195-014-0061-3
• research-article • Previous Articles Next Articles
Chao Wang1, Hua Ding1,2(), Jun Zhang1, Hongyan Wu2
Received:
2014-03-25
Revised:
2014-04-22
Online:
2014-06-25
Published:
2014-07-18
Chao Wang, Hua Ding, Jun Zhang, Hongyan Wu. Effect of Intercritical Annealing Time on the Microstructures and Tensile Properties of a High Strength TRIP Steel[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(3): 457-463.
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Fig. 1 SEM images of the cold-rolled sample and the heat-treated sample with different annealing times (F ferrite, B bainite, P pearlite, RA retained austenite, M/A M/A island): a cold-rolled; b 830 °C/1 min + 440 °C/5 min; c 830 °C/3 min + 440 °C/5 min; d 830 °C/15 min + 440 °C/5 min; e 830 °C/30 min + 440 °C/5 min
Fig. 2 XRD patterns of the samples after intercritically annealed at 830 °C for different holding times and then isothermally heat treated at 440 °C for 5 min prior to tensile deformation
Annealing time (min) | Fraction of RA (vol%) | Carbon content in RA (wt%) |
---|---|---|
1 | 13.8 | 1.21 |
3 | 10.3 | 1.01 |
15 | 8.5 | 0.89 |
30 | <5.0 | 0.63 |
Table 1 Volume fraction of RA and the average carbon content in RA for samples after annealing at 830 °C for different times and isothermally heat treated at 440 °C for 5 min
Annealing time (min) | Fraction of RA (vol%) | Carbon content in RA (wt%) |
---|---|---|
1 | 13.8 | 1.21 |
3 | 10.3 | 1.01 |
15 | 8.5 | 0.89 |
30 | <5.0 | 0.63 |
Fig. 3 EPMA images of cold-rolled sample and heat-treated sample with different annealing times (F ferrite, B bainite, P pearlite, RA retained austenite, M/A M/A island): a cold-rolled sample, b 830 °C/1 min + 440 °C/5 min, c 830 °C/30 min + 440 °C/5 min
Fig. 4 EDX analysis results of precipitates in the heat-treated sample with different annealing time: a 830 °C/1 min + 440 °C/5 min; b 830 °C/30 min + 440 °C/5 min
Fig. 5 a Engineering stress–strain curves of the samples after intercritically annealed at 830 °C for different holding times and then isothermally heat treated at 440 °C for 5 min; b the instantaneous strain hardening exponent exponent (n) versus true strain
Annealing time (min) | YS (MPa) | TS (MPa) | TEL (%) | TS × TEL (MPa %) |
---|---|---|---|---|
1 | 591 | 1,103 | 21.3 | 23,493.9 |
3 | 548 | 1,034 | 19.9 | 20,576.6 |
15 | 530 | 965 | 19.1 | 18,431.5 |
30 | 494 | 871 | 18.5 | 16,113.5 |
Table 2 Mechanical properties of the samples after annealing at 830 °C for different times and isothermally heat treated at 440 °C for 5 min
Annealing time (min) | YS (MPa) | TS (MPa) | TEL (%) | TS × TEL (MPa %) |
---|---|---|---|---|
1 | 591 | 1,103 | 21.3 | 23,493.9 |
3 | 548 | 1,034 | 19.9 | 20,576.6 |
15 | 530 | 965 | 19.1 | 18,431.5 |
30 | 494 | 871 | 18.5 | 16,113.5 |
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