J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (4): 520-529.DOI: 10.1016/j.jmst.2018.10.017
• Orginal Article • Previous Articles Next Articles
Xu Zhangabc, Dianzhong Lic, Yiyi Lic, Shanping Luc*()
Received:
2018-07-29
Revised:
2018-10-03
Accepted:
2018-10-10
Online:
2019-04-05
Published:
2019-01-28
Contact:
Lu Shanping
Xu Zhang, Dianzhong Li, Yiyi Li, Shanping Lu. Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents[J]. J. Mater. Sci. Technol., 2019, 35(4): 520-529.
C | Si | Mn | Cr | Ni | Nb | N | |
---|---|---|---|---|---|---|---|
Nb00 | 0.086 | 0.47 | 1.70 | 26.51 | 21.0 | 0 | 0.098 |
Nb08 | 0.089 | 0.43 | 1.70 | 25.97 | 20.8 | 0.82 | 0.10 |
Table 1 Chemical composition of the weld metals (wt. %).
C | Si | Mn | Cr | Ni | Nb | N | |
---|---|---|---|---|---|---|---|
Nb00 | 0.086 | 0.47 | 1.70 | 26.51 | 21.0 | 0 | 0.098 |
Nb08 | 0.089 | 0.43 | 1.70 | 25.97 | 20.8 | 0.82 | 0.10 |
Fig. 5. SEM observations of the weld metals (a, c, e, g) Nb00 and (b, d, f, h) Nb08 after exposure to 700 °C for the different aging periods: (a, b) 50 h; (c, d) 100 h; (e, f) 500 h; (g, h) 1000 h.
Precipitates | Cr | Fe | Ni | Nb | Si | Mn |
---|---|---|---|---|---|---|
M23C6 | 62.16 | 32.32 | 2.28 | -- | 3.24 | -- |
Nb(C, N) | 10.90 | 6.89 | 0.54 | 81.66 | -- | -- |
α-Cr in Nb00 | 77.22 | 17.10 | 0.48 | -- | 2.57 | 2.64 |
α-Cr in Nb08 | 61.84 | 15.05 | 0.80 | 18.49 | 1.65 | 2.13 |
Z-CrNbN | 42.50 | 9.89 | 2.15 | 44.69 | -- | -- |
Table 2 The chemical compositions of the secondary phases in weld metals.
Precipitates | Cr | Fe | Ni | Nb | Si | Mn |
---|---|---|---|---|---|---|
M23C6 | 62.16 | 32.32 | 2.28 | -- | 3.24 | -- |
Nb(C, N) | 10.90 | 6.89 | 0.54 | 81.66 | -- | -- |
α-Cr in Nb00 | 77.22 | 17.10 | 0.48 | -- | 2.57 | 2.64 |
α-Cr in Nb08 | 61.84 | 15.05 | 0.80 | 18.49 | 1.65 | 2.13 |
Z-CrNbN | 42.50 | 9.89 | 2.15 | 44.69 | -- | -- |
Fig. 8. Morphology of the α-Cr phase in the weld metal after aging treatment for 1000 h: (a) Nb00; (b) Nb08 and the EDS results of the α-Cr phase in: (c) Nb00; (d) Nb08.
Fig. 10. (a) The bright TEM micrograph of the α-Cr phase in the Nb08 weld metal exposed to 700 °C for 1000 h; (b) The combined selected area electron diffraction of the α-Cr phase and austensitic matrix.
Fig. 11. SEM micrograph of the primary Nb(C, N) and the Z phase in the Nb08 weld metal after being exposed to 700 °C for 1000 h and the EDS line scanning result of the precipitates.
Fig. 12. (a) The relationship between strength of the weld metals and the aging time and (b) the variation of the elongation of the weld metal with the increase of the exposure time.
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