Acta Metallurgica Sinica (English Letters) ›› 2021, Vol. 34 ›› Issue (4): 579-589.DOI: 10.1007/s40195-020-01126-9
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Ji-Jin Xu1(), Shuai Wang1, Ze Chai1, Chun Yu1(), Jun-Mei Chen1, Hao Lu1
Received:
2020-04-28
Revised:
2020-06-10
Accepted:
2020-07-14
Online:
2021-04-10
Published:
2021-03-30
Contact:
Ji-Jin Xu,Chun Yu
About author:
Chun Yu,yuchun1980@sjtu.edu.cnJi-Jin Xu, Shuai Wang, Ze Chai, Chun Yu, Jun-Mei Chen, Hao Lu. Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(4): 579-589.
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Materials | C | Cr | Ni | Si | Mn | Mo | Cu | Nb | Fe |
---|---|---|---|---|---|---|---|---|---|
AISI 304 | 0.06 | 18.5 | 8.3 | 0.5 | 1.5 | 0.3 | 0.4 | 0.03 | Bal. |
ER308L | 0.02 | 18.1 | 9.7 | 0.6 | 1.9 | 0.2 | 0.01 | 0.007 | Bal. |
Table 1 Chemical compositions of base metal and filler (wt%)
Materials | C | Cr | Ni | Si | Mn | Mo | Cu | Nb | Fe |
---|---|---|---|---|---|---|---|---|---|
AISI 304 | 0.06 | 18.5 | 8.3 | 0.5 | 1.5 | 0.3 | 0.4 | 0.03 | Bal. |
ER308L | 0.02 | 18.1 | 9.7 | 0.6 | 1.9 | 0.2 | 0.01 | 0.007 | Bal. |
Methods | Groove type | Weld pass | Filler | Power (P/kW) | Welding speed (v/mm s-1) | Shield gas | Heat input (q/kJ mm-1) |
---|---|---|---|---|---|---|---|
LBW | I-type | Single-pass | - | 11 | 8 | N2 | 1.375 |
TIG | 30°-V-type | Multi-pass | ER308L | 2.8 | 2.2 | Ar | 1.270 (one of nine passes) |
Table 2 Welding process parameters
Methods | Groove type | Weld pass | Filler | Power (P/kW) | Welding speed (v/mm s-1) | Shield gas | Heat input (q/kJ mm-1) |
---|---|---|---|---|---|---|---|
LBW | I-type | Single-pass | - | 11 | 8 | N2 | 1.375 |
TIG | 30°-V-type | Multi-pass | ER308L | 2.8 | 2.2 | Ar | 1.270 (one of nine passes) |
Specimen | In air | In simulated primary water | $I_{\sigma} \left( \% \right)$ | $I_{\eta} \left( \% \right)$ | ISSRT (%) | ||
---|---|---|---|---|---|---|---|
$\sigma_{\text{a}}$ (MPa) | $\eta_{\text{a}}$ (%) | $\sigma_{\text{w}}$ (MPa) | $\eta_{\text{w}}$ (%) | ||||
LBW joint | 470 | 31.2 | 466 | 28.8 | 0.85 | 7.7 | 2.7 |
TIG joint | 534 | 38.9 | 529 | 34.7 | 1.12 | 9.4 | 3.9 |
Table 3 Corrosion properties of the two joints
Specimen | In air | In simulated primary water | $I_{\sigma} \left( \% \right)$ | $I_{\eta} \left( \% \right)$ | ISSRT (%) | ||
---|---|---|---|---|---|---|---|
$\sigma_{\text{a}}$ (MPa) | $\eta_{\text{a}}$ (%) | $\sigma_{\text{w}}$ (MPa) | $\eta_{\text{w}}$ (%) | ||||
LBW joint | 470 | 31.2 | 466 | 28.8 | 0.85 | 7.7 | 2.7 |
TIG joint | 534 | 38.9 | 529 | 34.7 | 1.12 | 9.4 | 3.9 |
Fig. 5 SEM fractographs in air: a overview of the LBW joint, b at the rim area of the LBW joint, c overview of the TIG joint, d at the rim area of the TIG joint
Fig. 6 SEM fractographs in simulated PRW environment: a overview of the LBW joint, b at the rim area of the LBW joint, c overview of the TIG joint, d at the rim area of the TIG joint
Fig. 11 XPS high-resolution spectra of different elements in the oxide film: a Cr 2p of the LBW joint, b Cr 2p of the TIG joint, c Fe 2p of the LBW joint, d Fe 2p of the TIG joint, e Ni 2p of the LBW joint, f Ni 2p of the TIG joint, g O 1s of the LBW joint, h O 1s of the TIG joint
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