J. Mater. Sci. Technol. ›› 2020, Vol. 42: 163-174.DOI: 10.1016/j.jmst.2019.10.012
• Orginal Article • Previous Articles Next Articles
Jun Gaoab, Jibo Tana, Ming Jiaoc, Xinqiang Wua*(), Lichen Tangc, Yifeng Huangc
Received:
2019-07-11
Revised:
2019-08-23
Accepted:
2019-10-05
Published:
2020-04-01
Online:
2020-04-16
Contact:
Wu Xinqiang
Jun Gao, Jibo Tan, Ming Jiao, Xinqiang Wu, Lichen Tang, Yifeng Huang. Role of welding residual strain and ductility dip cracking on corrosion fatigue behavior of Alloy 52/52M dissimilar metal weld in borated and lithiated high-temperature water[J]. J. Mater. Sci. Technol., 2020, 42: 163-174.
Fig. 1. (a) Schematics of the dissimilar weld joint for the location where the LCF specimen was taken from, (b) sampling position for microstructure observation, (c) OM morphology of 52b, (d) OM morphology of the interface of 52b and 52Mw and (e) OM morphology of 52Mw.
Material | Ni | Cr | Fe | C | Ti | Cu | Al | Mo | Nb + Ta | Si | Mn | P | S |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
52b | Bal | 29.51 | 11.0 | 0.041 | 0.55 | 0.004 | 0.56 | 0.01 | <0.05 | 0.18 | 0.74 | 0.006 | 0.0018 |
52Mw | Bal | 29.34 | 11.4 | 0.026 | 0.23 | 0.006 | 0.15 | 0.14 | 0.77 | 0.09 | 0.77 | 0.003 | 0.0012 |
Table 1 Compositions of Alloy 52/52M DMW in the present work (wt%).
Material | Ni | Cr | Fe | C | Ti | Cu | Al | Mo | Nb + Ta | Si | Mn | P | S |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
52b | Bal | 29.51 | 11.0 | 0.041 | 0.55 | 0.004 | 0.56 | 0.01 | <0.05 | 0.18 | 0.74 | 0.006 | 0.0018 |
52Mw | Bal | 29.34 | 11.4 | 0.026 | 0.23 | 0.006 | 0.15 | 0.14 | 0.77 | 0.09 | 0.77 | 0.003 | 0.0012 |
Control mode | Stroke |
---|---|
Waveform | Triangle |
Strain amplitude | ± 0.2 %, ± 0.6 % |
Strain ratio | -1 |
Strain rate | 0.04 % s-1, 0.004 % s-1 |
Temperature | 310 °C |
Water pressure | 11 MPa |
Dissolved oxygen | <5 ppb (by weight) |
B | 1200 ppm (by weight) |
Li | 2.2 ppm (by weight) |
Table 2 CF test conditions and parameters.
Control mode | Stroke |
---|---|
Waveform | Triangle |
Strain amplitude | ± 0.2 %, ± 0.6 % |
Strain ratio | -1 |
Strain rate | 0.04 % s-1, 0.004 % s-1 |
Temperature | 310 °C |
Water pressure | 11 MPa |
Dissolved oxygen | <5 ppb (by weight) |
B | 1200 ppm (by weight) |
Li | 2.2 ppm (by weight) |
Fig. 4. EBSD results of the Alloy 52/52M DMW: (a) IPF maps of 52b; the interface of (b) 52b and 52Mw and (c) 52Mw; (d) corresponding GB maps of 52b; the interface of (e) 52b and 52Mw and (f) 52Mw; (g) local misorientation of 52b; the interface of (h) 52b and 52Mw and (i) 52Mw.
Fig. 5. OM microstructures of as-welded defects in Alloy 52/52M DMW: (a-c) typical as-welded defects in 52/52M DMW; (d-f) magnifications of the as-welded defects as marked by arrows 1 in Fig. 5(a-c), respectively.
Fig. 6. EBSD results of as-welded crack as indicated by the arrows 1 in.(a-c) Fig. 5(a), (d-f) Fig. 5(b), (g-i) Fig. 5(c), and (j-l) the EBSD results of as-welded crack in 52Mw.
Fig. 9. Typical macrographies of the specimen tested at the strain amplitude of ±0.6 % in high-temperature water: (a) overall macrography of the specimen; (b) magnification of the fatigue main crack.
Fig. 10. Surface morphologies of fatigue specimens in high-temperature water: (a) oxides on the surface of the specimens; (b) SEM image showing the interaction between PSBs and surface microcrack; (c) SEM image showing PSBs cracks.
Fig. 11. Fracture characteristics of fatigue specimens in high-temperature water: (a, b) DDC cracks with the steps on the fracture surface; (c) SEM image of the fracture surface with the DDC fracture surface outlined; (d) typical fatigue striations and the oxide formed on the fracture surface.
Fig. 12. EBSD results of the growth manners of fatigue main crack and secondary cracks at the strain amplitude of ±0.6 %: (a-c) EBSD results of the fatigue main crack; (d-f) the secondary crack initiation along the RHAB; (g-i) the secondary crack initiation in a manner of transgranular fracture.
Fig. 13. Characterization of the secondary cracks on the fracture surface of CF specimen at the strain amplitude of ± 0.6 %: (a) whole fracture of the CF specimen; (b) magnification of two secondary cracks in (a); (c-h) EBSD results of the propagation manner of two secondary cracks.
Fig. 14. Schematic illustration of fatigue crack initiation and propagation process in high-temperature water: (a, b) transgranular initiation and propagation; (c, d) intergranular initiation; (e, f) intergranular propagation.
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