Acta Metallurgica Sinica (English Letters) ›› 2014, Vol. 27 ›› Issue (3): 469-475.DOI: 10.1007/s40195-014-0066-y
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Enbao Pan1, Hongshuang Di1(), Guangwei Jiang1,2, Chengren Bao3
Received:
2014-04-10
Revised:
2014-04-30
Online:
2014-06-25
Published:
2014-07-18
Enbao Pan, Hongshuang Di, Guangwei Jiang, Chengren Bao. Effect of Heat Treatment on Microstructures and Mechanical Properties of Hot-Dip Galvanized DP Steels[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(3): 469-475.
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Specimen No. | Soaking temperature (°C) | Soaking time (s) | CR1 (°C/s) | CR2 (°C/s) |
---|---|---|---|---|
1 | 790 | 30 | 12 | 12 |
2 | 820 | 30 | 12 | 12 |
3 | 850 | 30 | 12 | 12 |
4 | 850 | 30 | 6 | 12 |
5 | 850 | 30 | 12 | 7 |
6 | 850 | 30 | 24 | 7 |
7 | 850 | 45 | 24 | 7 |
8 | 850 | 100 | 24 | 7 |
Table 1 Parameters for heat treatment schedules for different specimens
Specimen No. | Soaking temperature (°C) | Soaking time (s) | CR1 (°C/s) | CR2 (°C/s) |
---|---|---|---|---|
1 | 790 | 30 | 12 | 12 |
2 | 820 | 30 | 12 | 12 |
3 | 850 | 30 | 12 | 12 |
4 | 850 | 30 | 6 | 12 |
5 | 850 | 30 | 12 | 7 |
6 | 850 | 30 | 24 | 7 |
7 | 850 | 45 | 24 | 7 |
8 | 850 | 100 | 24 | 7 |
Specimen No. | YS (MPa) | UTS (MPa) | YS/TS | TEL (%) | MVF (%) |
---|---|---|---|---|---|
1 | 550 | 800 | 0.69 | 18.5 | 7.0 |
2 | 485 | 785 | 0.62 | 18.0 | 15.7 |
3 | 463 | 840 | 0.55 | 18.0 | 19.6 |
4 | 413 | 780 | 0.53 | 17.0 | 12.9 |
5 | 472 | 775 | 0.61 | 18.0 | 15.9 |
6 | 440 | 800 | 0.55 | 21.5 | 13.7 |
7 | 476 | 840 | 0.57 | 19.5 | 14.6 |
8 | 369 | 805 | 0.46 | 20.0 | 15.4 |
Table 2 Mechanical properties and martensite volume fractions of different specimens
Specimen No. | YS (MPa) | UTS (MPa) | YS/TS | TEL (%) | MVF (%) |
---|---|---|---|---|---|
1 | 550 | 800 | 0.69 | 18.5 | 7.0 |
2 | 485 | 785 | 0.62 | 18.0 | 15.7 |
3 | 463 | 840 | 0.55 | 18.0 | 19.6 |
4 | 413 | 780 | 0.53 | 17.0 | 12.9 |
5 | 472 | 775 | 0.61 | 18.0 | 15.9 |
6 | 440 | 800 | 0.55 | 21.5 | 13.7 |
7 | 476 | 840 | 0.57 | 19.5 | 14.6 |
8 | 369 | 805 | 0.46 | 20.0 | 15.4 |
Fig. 2 Variation of annealing parameters on yield and ultimate tensile strengths of DP steel: a strength vs. soaking temperature for specimens Nos. 1–3; b strength vs. cooling rate CR1 for specimens Nos. 4–6; c strength vs. soaking time of specimens Nos. 6–8
Fig. 4 Optical micrographs of the DP steel processed under different conditions: a specimen No. 1; b specimen No. 2; c specimen No. 3; d specimen No. 4; e specimen No. 5; f specimen No. 6; g specimen No. 7; h specimen No. 8
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