Acta Metallurgica Sinica (English Letters) ›› 2017, Vol. 30 ›› Issue (5): 483-492.DOI: 10.1007/s40195-017-0557-8
Special Issue: 2017年钢铁材料专辑
• Orginal Article • Previous Articles Next Articles
Xu-Dong Li, Cheng-Ning Li, Guo Yuan(), Guo-Dong Wang
Received:
2016-10-23
Revised:
2016-12-06
Online:
2017-05-20
Published:
2017-05-23
About author:
These authors contributed equally to this work.
Xu-Dong Li, Cheng-Ning Li, Guo Yuan, Guo-Dong Wang. Effects of Cooling Paths on Through-Thickness Microstructure and Mechanical Properties of Heavy Gauge X80 Pipeline Steel[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(5): 483-492.
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C | Si | Mn | P | S | Nb | V | Ti | Cr | Mo | Fe |
---|---|---|---|---|---|---|---|---|---|---|
0.056 | 0.18 | 1.8 | 0.009 | 0.001 | 0.07 | 0.03 | 0.015 | 0.35 | 0.15 | Bal. |
Table 1 Chemical composition of the experimental steel (wt%)
C | Si | Mn | P | S | Nb | V | Ti | Cr | Mo | Fe |
---|---|---|---|---|---|---|---|---|---|---|
0.056 | 0.18 | 1.8 | 0.009 | 0.001 | 0.07 | 0.03 | 0.015 | 0.35 | 0.15 | Bal. |
Temperature (K) | cp (J kg-1 K-1) | λ (W m-1 K-1) |
---|---|---|
273 | 48.31 | 65.5074 |
373 | 48.34 | 60.4884 |
473 | 52.32 | 55.0746 |
573 | 57.12 | 49.5558 |
673 | 62.16 | 45.3432 |
773 | 70.14 | 41.1306 |
873 | 78.96 | 36.5148 |
973 | 86.94 | 33.2052 |
1073 | 91.14 | 28.5894 |
1173 | 61.74 | 27.9864 |
Table 2 Thermo-physical properties of the experimental steels [14]
Temperature (K) | cp (J kg-1 K-1) | λ (W m-1 K-1) |
---|---|---|
273 | 48.31 | 65.5074 |
373 | 48.34 | 60.4884 |
473 | 52.32 | 55.0746 |
573 | 57.12 | 49.5558 |
673 | 62.16 | 45.3432 |
773 | 70.14 | 41.1306 |
873 | 78.96 | 36.5148 |
973 | 86.94 | 33.2052 |
1073 | 91.14 | 28.5894 |
1173 | 61.74 | 27.9864 |
Fig. 5 Through-thickness microstructures obtained by Ult-Med UFC: a surface, b thickness of 1/8, c thickness of 1/4, d thickness of 3/8, e thickness of 1/2
Fig. 6 Through-thickness microstructures obtained by Med-Ult UFC: a surface, b thickness of 1/8, c thickness of 1/4, d thickness of 3/8, e thickness of 1/2
Fig. 7 TEM micrographs of steels: a surface of LC process, b center of LC process, c surface of Ult-Med UFC process, d center of Ult-Med UFC process, e surface of Med-Ult UFC process, f center of Med-Ult UFC process
Cooling process | Rt0.5 (MPa) | Rm (MPa) | A50 (%) | vE at 253 K (J) |
---|---|---|---|---|
LC | 542 | 677 | 23 | 235, 220, 263 |
Ult-Med UFC | 610 | 719 | 21 | 282, 289, 280 |
Med-Ult UFC | 621 | 728 | 21.5 | 289, 294, 291 |
API X80 | 552-690 | 621-827 | 15 | ≥145 (268 K) |
Table 3 Mechanical properties of the experimental steels cooled at various paths
Cooling process | Rt0.5 (MPa) | Rm (MPa) | A50 (%) | vE at 253 K (J) |
---|---|---|---|---|
LC | 542 | 677 | 23 | 235, 220, 263 |
Ult-Med UFC | 610 | 719 | 21 | 282, 289, 280 |
Med-Ult UFC | 621 | 728 | 21.5 | 289, 294, 291 |
API X80 | 552-690 | 621-827 | 15 | ≥145 (268 K) |
Fig. 8 Impact specimen fractographs obtained by LC: a low-magnification fractographs, b high-magnification fractographs of region A, c high-magnification fractographs of region B, d low-magnification fractographs of delamination, e high-magnification fractographs of delamination surface (region C)
Fig. 9 Impact specimen fractographs obtained by Ult-Med UFC: a low-magnification fractographs, b high-magnification fractographs of region A, c high-magnification fractographs of region B
Fig. 10 Impact specimen fractographs obtained by Med-Ult UFC: a low-magnification fractographs, b high-magnification fractographs of region A, c high-magnification fractographs of region B
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