Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (4): 527-536.DOI: 10.1007/s40195-021-01250-0
Wen-Ting Zhu1, Jun-Jun Cui2(), Zhen-Ye Chen1,3, Yang Zhao4, Li-Qing Chen1()
Received:
2021-01-27
Revised:
2021-03-15
Accepted:
2021-04-06
Online:
2021-05-13
Published:
2021-05-13
Contact:
Jun-Jun Cui,Li-Qing Chen
About author:
Li-Qing Chen, lqchen@mail.neu.edu.cnWen-Ting Zhu, Jun-Jun Cui, Zhen-Ye Chen, Yang Zhao, Li-Qing Chen. Correlation of Microstructure Feature with Impact Fracture Behavior in a TMCP Processed High Strength Low Alloy Construction Steel[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(4): 527-536.
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C | Si | Mn | Nb + V + Ti | Cr + Cu + Ni | Mo | N | B | P | S | Fe |
---|---|---|---|---|---|---|---|---|---|---|
0.08 | 0.3 | 1.1 | 0.12 | 1.1 | 0.4 | 0.004 | 0.002 | 0.008 | 0.0016 | Bal |
Table 1 Chemical composition of the experimental steel (wt%)
C | Si | Mn | Nb + V + Ti | Cr + Cu + Ni | Mo | N | B | P | S | Fe |
---|---|---|---|---|---|---|---|---|---|---|
0.08 | 0.3 | 1.1 | 0.12 | 1.1 | 0.4 | 0.004 | 0.002 | 0.008 | 0.0016 | Bal |
Fig. 1 Schematic illustration of thermo-mechanical controlled processing for the experimental steels (RRST - rough rolling start temperature; RRFT - rough rolling finish temperature; FRST - finish rolling start temperature; FRFT - finish rolling finish temperature; SCT - start cooling temperature; FCT - finish cooling temperature)
Steel | Rough rolling | Finish rolling | Accelerated cooling | Cooling rate from SCT to FCT(°C·s-1) | |||
---|---|---|---|---|---|---|---|
RRST (°C) | RRFT (°C) | FRST (°C) | FRFT (°C) | SCT (°C) | FCT (°C) | ||
FCT580 | 1127 | 1078 | 930 | 893 | 780 | 578 | 15 |
FCT480 | 1086 | 1052 | 930 | 882 | 780 | 484 | 20 |
FCT380 | 1091 | 1065 | 930 | 905 | 780 | 381 | 20 |
Table 2 Processing parameters used in two-stage controlled rolling and controlled cooling
Steel | Rough rolling | Finish rolling | Accelerated cooling | Cooling rate from SCT to FCT(°C·s-1) | |||
---|---|---|---|---|---|---|---|
RRST (°C) | RRFT (°C) | FRST (°C) | FRFT (°C) | SCT (°C) | FCT (°C) | ||
FCT580 | 1127 | 1078 | 930 | 893 | 780 | 578 | 15 |
FCT480 | 1086 | 1052 | 930 | 882 | 780 | 484 | 20 |
FCT380 | 1091 | 1065 | 930 | 905 | 780 | 381 | 20 |
Fig. 2 SEM micrographs of the experimental steels with different finish cooling temperatures:a FCT580, the inset is the magnified image of pearlite; b FCT480; c FCT380
Steel | Volume percentage (%) | Effective grain size (μm) | ||||
---|---|---|---|---|---|---|
GB | LB | P | BF | M/A | ||
FCT580 | 77.1 ± 9.3 | 8.5 ± 2.1 | 1.9 ± 0.7 | 12.5 ± 3.3 | 2.6 ± 1.1 | 4.1 ± 1.1 |
FCT480 | 12.2 ± 2.4 | 48.3 ± 7.5 | 0 | 39.5 ± 6.1 | 4.1 ± 0.7 | 2.7 ± 0.4 |
FCT380 | 8.5 ± 1.8 | 63.2 ± 8.6 | 0 | 28.3 ± 4.4 | 9.7 ± 2.2 | 1.5 ± 0.9 |
Table 3 Microstructural features of the experimental steels with different finish cooling temperatures
Steel | Volume percentage (%) | Effective grain size (μm) | ||||
---|---|---|---|---|---|---|
GB | LB | P | BF | M/A | ||
FCT580 | 77.1 ± 9.3 | 8.5 ± 2.1 | 1.9 ± 0.7 | 12.5 ± 3.3 | 2.6 ± 1.1 | 4.1 ± 1.1 |
FCT480 | 12.2 ± 2.4 | 48.3 ± 7.5 | 0 | 39.5 ± 6.1 | 4.1 ± 0.7 | 2.7 ± 0.4 |
FCT380 | 8.5 ± 1.8 | 63.2 ± 8.6 | 0 | 28.3 ± 4.4 | 9.7 ± 2.2 | 1.5 ± 0.9 |
Fig. 4 Relative frequency of different misorientation angles for the experimental steels with different finish cooling temperatures: a misorientation angle < 15°; b misorientation angle between 15° and 35°; c misorientation angle between 35° and 50°; d misorientation angle > 50°
Steel | Yield strength (MPa) | Ultimate tensile strength (MPa) | Total elongation (%) | Yield ratio |
---|---|---|---|---|
FCT580 | 550 ± 7 | 827 ± 11 | 19.2 ± 1.4 | 0.67 ± 0.02 |
FCT480 | 700 ± 8 | 843 ± 9 | 16.7 ± 0.8 | 0.83 ± 0.01 |
FCT380 | 885 ± 4 | 1089 ± 12 | 15.3 ± 1.1 | 0.81 ± 0.01 |
Table 4 Tensile properties of the experimental steel at different finish cooling temperatures
Steel | Yield strength (MPa) | Ultimate tensile strength (MPa) | Total elongation (%) | Yield ratio |
---|---|---|---|---|
FCT580 | 550 ± 7 | 827 ± 11 | 19.2 ± 1.4 | 0.67 ± 0.02 |
FCT480 | 700 ± 8 | 843 ± 9 | 16.7 ± 0.8 | 0.83 ± 0.01 |
FCT380 | 885 ± 4 | 1089 ± 12 | 15.3 ± 1.1 | 0.81 ± 0.01 |
Fig. 9 Variations of impact load and impact absorbed energy vs deflection for the experimental steels with different finish cooling temperatures: a FCT580; b FCT480; c FCT380
Steel | Pm (kN) | Pf (kN) | Pa (kN) | Pm - Pf (kN) | Pa/Pf | E (J) | E1 (J) | E2 (J) | E3 (J) |
---|---|---|---|---|---|---|---|---|---|
FCT580 | 6.35 | 6.25 | 1.97 | 0.10 | 0.32 | 7.51 | 1.92 | 0.32 | 5.27 |
FCT480 | 20.27 | 7.27 | 3.30 | 13.00 | 0.45 | 59.35 | 26.08 | 11.60 | 21.67 |
FCT380 | 21.00 | 4.78 | 3.00 | 16.22 | 0.63 | 88.66 | 27.73 | 37.26 | 23.67 |
Table 5 Experimental data of the instrumented CVN impact test for the experimental steels with various finish cooling temperatures
Steel | Pm (kN) | Pf (kN) | Pa (kN) | Pm - Pf (kN) | Pa/Pf | E (J) | E1 (J) | E2 (J) | E3 (J) |
---|---|---|---|---|---|---|---|---|---|
FCT580 | 6.35 | 6.25 | 1.97 | 0.10 | 0.32 | 7.51 | 1.92 | 0.32 | 5.27 |
FCT480 | 20.27 | 7.27 | 3.30 | 13.00 | 0.45 | 59.35 | 26.08 | 11.60 | 21.67 |
FCT380 | 21.00 | 4.78 | 3.00 | 16.22 | 0.63 | 88.66 | 27.73 | 37.26 | 23.67 |
Fig. 10 Schematic diagram and SEM morphologies of the impact fractured surfaces for the experimental steels with different finish cooling temperatures: a schematic diagram; b and c FCT580; d-f FCT480; g-i FCT380
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