J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (12): 1504-1512.DOI: 10.1016/j.jmst.2017.09.013
Special Issue: 2017腐蚀与防护专辑
• Orginal Article • Previous Articles Next Articles
Li Jing, Gao Xiuhua*(), Du Linxiu, Liu Zhenguang
Received:
2017-01-06
Revised:
2017-02-14
Accepted:
2017-02-15
Online:
2017-12-20
Published:
2018-01-30
Contact:
Gao Xiuhua
Li Jing, Gao Xiuhua, Du Linxiu, Liu Zhenguang. Relationship between microstructure and hydrogen induced cracking behavior in a low alloy pipeline steel[J]. J. Mater. Sci. Technol., 2017, 33(12): 1504-1512.
C | Si | Mn | P | S | Ni | Cr | Cu | Mo | Nb | Ti | Al | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.05 | 0.20 | 1.50 | 0.005 | 0.001 | 0.20 | 0.30 | 0.30 | 0.20 | 0.04 | 0.01 | 0.03 | Bal. |
Table 1 Chemical composition of the experimental steel (mass fraction, %).
C | Si | Mn | P | S | Ni | Cr | Cu | Mo | Nb | Ti | Al | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.05 | 0.20 | 1.50 | 0.005 | 0.001 | 0.20 | 0.30 | 0.30 | 0.20 | 0.04 | 0.01 | 0.03 | Bal. |
Steel | Rough rolling | Finish rolling | Accelerated cooling | |||
---|---|---|---|---|---|---|
Start rolling temp. (°C) | Finish rolling temp. (°C) | Start rolling temp. (°C) | Finish rolling temp. (°C) | Finish cooling temp. (°C) | Cooling rate(°C s-1) | |
QF | 1174 | 1112 | 819 | 810 | 500 | 24 |
GB | 1112 | 1022 | 809 | 805 | 450 | 24 |
LB | 1147 | 1105 | 819 | 807 | 300 | 72 |
Table 2 Processing parameters in the TMCP for the experimental steel.
Steel | Rough rolling | Finish rolling | Accelerated cooling | |||
---|---|---|---|---|---|---|
Start rolling temp. (°C) | Finish rolling temp. (°C) | Start rolling temp. (°C) | Finish rolling temp. (°C) | Finish cooling temp. (°C) | Cooling rate(°C s-1) | |
QF | 1174 | 1112 | 819 | 810 | 500 | 24 |
GB | 1112 | 1022 | 809 | 805 | 450 | 24 |
LB | 1147 | 1105 | 819 | 807 | 300 | 72 |
Steel | Rt0.5 (MPa) | Rm (MPa) | Rt0.5/Rm | A50 (%) | Ak (J) (-20 °C) |
---|---|---|---|---|---|
QF | 557 | 705 | 0.79 | 22 | 293 |
GB | 600 | 695 | 0.87 | 22 | 279 |
LB | 680 | 933 | 0.73 | 17 | 175 |
Table 3 Mechanical properties of the experimental steels.
Steel | Rt0.5 (MPa) | Rm (MPa) | Rt0.5/Rm | A50 (%) | Ak (J) (-20 °C) |
---|---|---|---|---|---|
QF | 557 | 705 | 0.79 | 22 | 293 |
GB | 600 | 695 | 0.87 | 22 | 279 |
LB | 680 | 933 | 0.73 | 17 | 175 |
Samples | Sections | CLR (%) | CTR (%) | CSR (%) |
---|---|---|---|---|
QF | 1 | 0 | 0 | 0 |
2 | 0 | 0 | 0 | |
3 | 0 | 0 | 0 | |
average | 0 | 0 | 0 | |
GB | 1 | 0 | 0 | 0 |
2 | 0 | 0 | 0 | |
3 | 0 | 0 | 0 | |
average | 0 | 0 | 0 | |
LB | 1 | 0.2592 | 0.0691 | 0.0011 |
2 | 0 | 0 | 0 | |
3 | 0 | 0 | 0 | |
average | 0.0864 | 0.0230 | 0.0004 |
Table 4 HIC susceptibility parameters of tested steels.
Samples | Sections | CLR (%) | CTR (%) | CSR (%) |
---|---|---|---|---|
QF | 1 | 0 | 0 | 0 |
2 | 0 | 0 | 0 | |
3 | 0 | 0 | 0 | |
average | 0 | 0 | 0 | |
GB | 1 | 0 | 0 | 0 |
2 | 0 | 0 | 0 | |
3 | 0 | 0 | 0 | |
average | 0 | 0 | 0 | |
LB | 1 | 0.2592 | 0.0691 | 0.0011 |
2 | 0 | 0 | 0 | |
3 | 0 | 0 | 0 | |
average | 0.0864 | 0.0230 | 0.0004 |
Fig. 7. Grain boundary misorientation map of the experimental steels: (a) steel QF, (b) steel GB, (c) steel LB. Black and red lines indicate the ferrite grain boundary (θ ≥ 15°) and low misorientation angle boundary (2° ≤ θ ≤ 15°), respectively.
Fig. 10. Precipitation characteristics under TEM: (a) Nbx(C,N)y particles, (b) composition of Nbx(C,N)y particles by EDS, (c) morphology of composite carbonitride precipitations formed by Ti and Nb, (d) composition of (Nb,Ti) (C,N) particles by EDS.
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