J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (12): 1561-1571.DOI: 10.1016/j.jmst.2017.09.001
• Orginal Article • Previous Articles Next Articles
Di Hongshuanga, Sun Qiana, Wang Xiaonanb*(), Li Jianpinga
Received:
2016-11-24
Revised:
2017-02-11
Accepted:
2017-02-19
Online:
2017-12-20
Published:
2018-01-30
Contact:
Wang Xiaonan
Di Hongshuang, Sun Qian, Wang Xiaonan, Li Jianping. Microstructure and properties in dissimilar/similar weld joints between DP780 and DP980 steels processed by fiber laser welding[J]. J. Mater. Sci. Technol., 2017, 33(12): 1561-1571.
Materials | C | Si | Mn | Ti | Cr | Mo | Al | Fe | CE |
---|---|---|---|---|---|---|---|---|---|
DP980 | 0.09-0.11 | 0.3-0.5 | 1.6-1.8 | 0.01-0.03 | 0.3-0.5 | 0.2-0.4 | 0.04-0.06 | Bal. | 0.584 |
DP780 | 0.07-0.09 | 0.1-0.2 | 1.6-1.8 | - | 0.2-0.4 | 0.1-0.3 | 0.3-0.5 | Bal. | 0.499 |
Table 1 Chemical composition of experimental steels (wt%).
Materials | C | Si | Mn | Ti | Cr | Mo | Al | Fe | CE |
---|---|---|---|---|---|---|---|---|---|
DP980 | 0.09-0.11 | 0.3-0.5 | 1.6-1.8 | 0.01-0.03 | 0.3-0.5 | 0.2-0.4 | 0.04-0.06 | Bal. | 0.584 |
DP780 | 0.07-0.09 | 0.1-0.2 | 1.6-1.8 | - | 0.2-0.4 | 0.1-0.3 | 0.3-0.5 | Bal. | 0.499 |
Materials | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | n | Fracture location |
---|---|---|---|---|---|
DP780-980 | 905 | 555 | 11.4 | 0.10 | 780 BM |
DP780-780 | 875 | 525 | 17.2 | 0.13 | BM |
DP980-980 | 1080 | 695 | 12.7 | 0.11 | BM |
DP780 BM | 885 | 525 | 18.7 | 0.14 | BM |
DP980 BM | 1080 | 690 | 12.5 | 0.12 | BM |
Table 2 Tensile test results of different materials.
Materials | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | n | Fracture location |
---|---|---|---|---|---|
DP780-980 | 905 | 555 | 11.4 | 0.10 | 780 BM |
DP780-780 | 875 | 525 | 17.2 | 0.13 | BM |
DP980-980 | 1080 | 695 | 12.7 | 0.11 | BM |
DP780 BM | 885 | 525 | 18.7 | 0.14 | BM |
DP980 BM | 1080 | 690 | 12.5 | 0.12 | BM |
Length of DP980 side (mm) | Elongation percentage of DP980 side (%) | Length of DP780 side (mm) | Elongation percentage of DP780 side (%) | Fracture location from FZ center (mm) | |
---|---|---|---|---|---|
Non-tensile | 35 | - | 35 | - | - |
After-tensile | 36 | 12.5 | 42 | 82.5 | 23 |
Table 3 Two sides of tensile sample of dissimilar weld joints between DP780 and DP980.
Length of DP980 side (mm) | Elongation percentage of DP980 side (%) | Length of DP780 side (mm) | Elongation percentage of DP780 side (%) | Fracture location from FZ center (mm) | |
---|---|---|---|---|---|
Non-tensile | 35 | - | 35 | - | - |
After-tensile | 36 | 12.5 | 42 | 82.5 | 23 |
Materials | IE (mm) | Fracture location |
---|---|---|
DP780-DP980 | 6.665 | DP780 HAZ |
DP780- DP780 | 7.994 | FZ |
DP980- DP980 | 6.982 | HAZ |
DP780 BM | 8.718 | - |
DP980 BM | 8.148 | - |
Table 4 Erichsen test results.
Materials | IE (mm) | Fracture location |
---|---|---|
DP780-DP980 | 6.665 | DP780 HAZ |
DP780- DP780 | 7.994 | FZ |
DP980- DP980 | 6.982 | HAZ |
DP780 BM | 8.718 | - |
DP980 BM | 8.148 | - |
Materials | σ (MPa) | Fatigue life cycle (N) | Fatigue Fracture location |
---|---|---|---|
DP780- DP980 | 540 | 42355 | FZ |
DP780- DP780 | 540 | 44836 | FZ |
DP980- DP980 | 540 | 115824 | FZ |
DP780 BM | 540 | 10000222 | No failure |
DP980 BM | 540 | 10000222 | No failure |
Table 5 Fatigue results of all the samples.
Materials | σ (MPa) | Fatigue life cycle (N) | Fatigue Fracture location |
---|---|---|---|
DP780- DP980 | 540 | 42355 | FZ |
DP780- DP780 | 540 | 44836 | FZ |
DP980- DP980 | 540 | 115824 | FZ |
DP780 BM | 540 | 10000222 | No failure |
DP980 BM | 540 | 10000222 | No failure |
Fig. 13. Microscopic of fatigue fracture of all the weld joints: (a) DP780- DP780, (b) DP980- DP980, (c) DP780, (d) crack initiation zone, (e) crack propagation zone.
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