J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (4): 643-652.DOI: 10.1016/j.jmst.2017.11.037
Special Issue: Stainless Steel & High Strength Steel 2018
• Orginal Article • Previous Articles Next Articles
Jian Liu, Jia Li*(), Xu Cheng, Huaming Wang
Received:
2017-07-07
Revised:
2017-08-28
Accepted:
2017-11-13
Online:
2018-04-20
Published:
2018-05-04
Contact:
Li Jia
Jian Liu, Jia Li, Xu Cheng, Huaming Wang. Microstructures and tensile properties of laser cladded AerMet100 steel coating on 300 M steel[J]. J. Mater. Sci. Technol., 2018, 34(4): 643-652.
C | Si | Cr | Mn | Ni | Co | Mo | V | Fe | |
---|---|---|---|---|---|---|---|---|---|
300M | 0.41-0.46 | 1.45-1.80 | 0.65-0.95 | 0.65-0.90 | 1.60-2.00 | - | 0.30-0.40 | 0.05-0.10 | Bal. |
AerMet100 | 0.21-0.25 | ≤0.10 | 2.90-3.30 | ≤0.10 | 11.0-12.0 | 13.0-14.0 | 1.10-1.30 | - | Bal. |
Table 1 Nominal chemical composition 300 M steel and AerMet100 steel (wt%).
C | Si | Cr | Mn | Ni | Co | Mo | V | Fe | |
---|---|---|---|---|---|---|---|---|---|
300M | 0.41-0.46 | 1.45-1.80 | 0.65-0.95 | 0.65-0.90 | 1.60-2.00 | - | 0.30-0.40 | 0.05-0.10 | Bal. |
AerMet100 | 0.21-0.25 | ≤0.10 | 2.90-3.30 | ≤0.10 | 11.0-12.0 | 13.0-14.0 | 1.10-1.30 | - | Bal. |
Fig. 5. (a) SEM, (b) phase map, (c) TEM morphology and (d) XRD patterns of AerMet100 clad layer. Red color in phase map is retained austenite and the green color is the martensite matrix.
Position | Si | Cr | Fe | Ni | Co | Mo |
---|---|---|---|---|---|---|
Dendrite arm (Spectrum 1) | 0.31 | 2.59 | 74.71 | 9.57 | 12.16 | 0.66 |
Interdendritic region (Spectrum 2) | 0.44 | 3.55 | 72.05 | 9.92 | 12.00 | 2.04 |
Table 2 EPMA results of main alloy elements in dendrite arm and interdendritic region of AerMet100 clad layer (wt%).
Position | Si | Cr | Fe | Ni | Co | Mo |
---|---|---|---|---|---|---|
Dendrite arm (Spectrum 1) | 0.31 | 2.59 | 74.71 | 9.57 | 12.16 | 0.66 |
Interdendritic region (Spectrum 2) | 0.44 | 3.55 | 72.05 | 9.92 | 12.00 | 2.04 |
Fig. 6. (a) Microstructures and (b) phase map of compositional transition zone, (c) microstructures of AerMet100/300 M interface, (d) microstructures of clad layer. Red color in phase map is retained austenite and the green color is the bainite/martensite matrix.
Fig. 7. Microstructures of 300 M steel HAZ: (a) low-magnification morphology; high-magnification microstructure of (b) HAZ-1, (c) HAZ-2, (d) HAZ-3 and (e) HAZ-S.
Fig. 8. Phase maps and XRD patterns of 300 M steel HAZ: (a) HAZ-1; (b) HAZ-2; (c) HAZ-3; (d) HAZ-S; (e) XRD patterns. Red color in phase map is retained austenite and the green color is the bainite matrix.
Fig. 10. Thermal processes and phase transformation in different regions of 300 M HAZ: (a) macrostructure of AerMet100/300 M steel; (b) schematic showing phase transformation in HAZ-1; (c) schematic showing phase transformation in HAZ-2; (d) schematic showing phase transformation in HAZ-S. Solid and dash lines in (a) indicate the Ac3 heating temperature during laser cladding. White spots and grey spots in inhomogeneous austenite indicate the carbon-depleted zones and carbon-rich areas, respectively.
Specimen condition | 0.2% proof stress, Rp0.2 (MPa) | Tensile strength, Rm (MPa) | Elongation, A (%) |
---|---|---|---|
TS-T | 851 ± 18 | 1443 ± 24 | 5.3 ± 0.4 |
TS-S | 1496 ± 16 | 1821 ± 19 | 7.2 ± 0.8 |
300M | 1697 ± 47 | 2028 ± 54 | 7.9 ± 0.5 |
Table 3 Tensile properties of TS-T, TS-S and 300 M steel.
Specimen condition | 0.2% proof stress, Rp0.2 (MPa) | Tensile strength, Rm (MPa) | Elongation, A (%) |
---|---|---|---|
TS-T | 851 ± 18 | 1443 ± 24 | 5.3 ± 0.4 |
TS-S | 1496 ± 16 | 1821 ± 19 | 7.2 ± 0.8 |
300M | 1697 ± 47 | 2028 ± 54 | 7.9 ± 0.5 |
Fig. 14. Nanoindentation on (a) thick plate bainite (PB), (b) blocky retained austenite (BA) and (c) mixed microstructures of fine needle-like bainite and film-like retained austenite (NB + FA) and (d) load-depth curves of nanoindentation test.
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