J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (8): 1281-1292.DOI: 10.1016/j.jmst.2017.11.051
Special Issue: Corrosion in 2018
• Orginal Article • Previous Articles Next Articles
Lijin Dongab, Qunjia Pengb(), En-Hou Hanb, Wei Keb, Lei Wanga
Received:
2017-08-14
Revised:
2017-11-13
Accepted:
2017-11-20
Online:
2018-08-17
Published:
2018-08-22
Lijin Dong, Qunjia Peng, En-Hou Han, Wei Ke, Lei Wang. Microstructure and intergranular stress corrosion cracking susceptibility of a SA508-52M-316L dissimilar metal weld joint in primary water[J]. J. Mater. Sci. Technol., 2018, 34(8): 1281-1292.
Fig. 1. Schematic illustration of the DMWJ and specimens: (a) the location of SSRT and microstructure-analysis specimens, (b) the geometry and dimension of the SSRT specimen.
C | Si | Mn | P | S | Cu | Mo | Ni | Cr | Fe | Nb + Ta | Al | Ti | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SA508 | 0.187 | 0.18 | 1.35 | 0.009 | 0.003 | 0.02 | 0.49 | 0.75 | 0.12 | Bal. | - | - | - |
316L | 0.025 | 0.52 | 1.71 | 0.019 | 0.03 | 0.01 | 2.4 | 11.7 | 17.9 | Bal. | - | - | - |
52 Mw | 0.026 | 0.1 | 0.75 | <0.005 | 0.002 | 0.06 | <0.05 | Bal. | 29.49 | 9.27 | 0.69 | 0.11 | 0.2 |
52 Mb | 0.026 | 0.11 | 0.86 | 0.004 | 0.003 | <0.01 | 0.02 | Bal. | 29.02 | 10.11 | 0.69 | 0.1 | 0.22 |
Table 1 Chemical composition of the base and weld metals of the SA508-52M-316L DMWJ (mass fraction, %).
C | Si | Mn | P | S | Cu | Mo | Ni | Cr | Fe | Nb + Ta | Al | Ti | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SA508 | 0.187 | 0.18 | 1.35 | 0.009 | 0.003 | 0.02 | 0.49 | 0.75 | 0.12 | Bal. | - | - | - |
316L | 0.025 | 0.52 | 1.71 | 0.019 | 0.03 | 0.01 | 2.4 | 11.7 | 17.9 | Bal. | - | - | - |
52 Mw | 0.026 | 0.1 | 0.75 | <0.005 | 0.002 | 0.06 | <0.05 | Bal. | 29.49 | 9.27 | 0.69 | 0.11 | 0.2 |
52 Mb | 0.026 | 0.11 | 0.86 | 0.004 | 0.003 | <0.01 | 0.02 | Bal. | 29.02 | 10.11 | 0.69 | 0.1 | 0.22 |
Fig. 2. OM observation of the SA508-52M-316L DMWJ: (a) the FB region of the SA508-52 Mb dissimilar welding structure, (b) the FB region of the 52 Mw-316L dissimilar welding structure, (c) Alloy 52 Mw, (d) 316L base metal.
Fig. 3. Composition profiles of the SA508-52M-316L DMWJ: (a) the overall composition profile, (b) composition profile of the FB region of the SA508-52 Mb dissimilar welding structure, (c) composition profile of the FB region of the 52 Mw-316L dissimilar welding structure.
Fig. 4. Microhardness distribution in the SA508-52M-316L DMWJ: (a) the overall microhardness distribution, (b) microhardness distribution in the FB region of the SA508-52 Mb dissimilar welding structure, (c) microhardness distribution in the FB region of the 52 Mw-316L dissimilar welding structure.
Fig. 5. Grain boundary chemistry of Alloy 52 Mb and Alloy 52 Mw analyzed by TEM: (a) and (c) grain boundary morphology of Alloy 52 Mb with a distance of 20 μm and 500 μm to the FB, respectively, (b) and (d) composition profile across the grain boundary adjacent to the carbide along the lines shown in (a) and (c), respectively, (e) grain boundary morphology of Alloy 52 Mw, (f) composition profile across the grain boundary along the line shown in (e).
Fig. 7. The KAM and GBCD distribution versus distance to the FB in the 52 Mw-316L dissimilar welding structure: (a) KAM adjacent to grain boundary, (b) GBCD.
Fig. 8. EBSD analyses of both Alloy 52 Mb and the FB region in the SA508-52 Mb dissimilar welding structure: (a) and (d) IPFs, (b) and (e) KAM maps, (c) and (f) GBCD maps.
Fig. 9. SEM observations of cracking in Alloy 52 Mw: (a) surface morphology following 10% strain by SSRT, (b) surface morphology following 25% strain by SSRT, (c) an overall observation of fracture surface after SSRT test, (d) observation at higher magnification showing the transgranular cracking feature.
Fig. 10. SEM observations and SEM-EBSD analyses of cracking in the HAZ of 316L: (a) surface morphology following 15% strain by SSRT, (b) surface morphology following 20% strain by SSRT, (c) an overall observation of fracture surface after SSRT test, (d) observations at higher magnification showing the IGSCC feature, (e) and (f) GBCD and KAM distribution maps showing the IGSCC on cross-section of the specimen, respectively.
Fig. 11. SEM observations and SEM-EBSD analyses of cracking in the FB region of the SA508-52 Mb dissimilar welding structure: (a) surface morphology following 10% strain by SSRT, (b) surface morphology following 15% strain by SSRT, (c) an overall observation of fracture surface after SSRT test, (d) observation at higher magnification showing the IGSCC feature, (e) and (f) GBCD map showing the IGSCC on the surface and cross-section of the specimen, respectively.
Fig. 12. SEM observations of cracking in the FB region of the 52 Mw-316L dissimilar welding structure: (a) surface morphology of the HAZ of 316L following 20% strain by SRRT, (b) surface morphology of the DZ of Alloy 52 Mw following 20% strain by SSRT, (c) an overall observation of fracture surface after SSRT, (d) observation at higher magnification showing the IGSCC feature.
Fig. 13. Densities of cracks observed in the gauge section of specimens S1-S5 following different interrupted strains of SSRT in primary water. In this figure, the densities of cracks in the HAZ of 316L stainless steel and Alloy 52 Mb are mm-2 and mm-1, respectively.
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