Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (10): 1298-1308.DOI: 10.1007/s40195-019-00894-3
Special Issue: 2018-2019高温合金专辑
Yuan-Guo Tan1,2, Fang Liu1, An-Wen Zhang1,2, Da-Wei Han1, Xiao-Yu Yao1,2, Wei-Wei Zhang1,2, Wen-Ru Sun1()
Received:
2019-01-16
Revised:
2019-02-28
Online:
2019-10-10
Published:
2019-09-17
Yuan-GuoTan, Fang Liu, An-Wen Zhang, Da-Wei Han, Xiao-Yu Yao, Wei-Wei Zhang, Wen-Ru Sun. Element Segregation and Solidification Behavior of a Nb, Ti, Al Co-Strengthened Superalloy ЭК151[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(10): 1298-1308.
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C | Cr | Co | W | Mo | Al | Nb | Ti | V | B | Ni |
---|---|---|---|---|---|---|---|---|---|---|
0.06 | 10.86 | 14.93 | 2.93 | 4.41 | 3.62 | 3.26 | 2.73 | 0.59 | 0.003 | Bal. |
Table 1 Chemistry (wt%) of ЭК151 alloy
C | Cr | Co | W | Mo | Al | Nb | Ti | V | B | Ni |
---|---|---|---|---|---|---|---|---|---|---|
0.06 | 10.86 | 14.93 | 2.93 | 4.41 | 3.62 | 3.26 | 2.73 | 0.59 | 0.003 | Bal. |
Element | V | Cr | Co | Ni | W | Nb | Mo | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
Matrix | 0.68 | 12.36 | 15.28 | 54.15 | 0.41 | 2.79 | 2.78 | 4.60 | 6.97 |
Phase A | 0.45 | 4.65 | 13.38 | 58.39 | 0.34 | 7.30 | 1.11 | 8.61 | 6.76 |
Phase B | 0.43 | 6.37 | 12.30 | 58.89 | 0.26 | 3.28 | 1.38 | 6.84 | 9.30 |
Phase C | 0.60 | 20.94 | 19.67 | 33.40 | 0.68 | 9.92 | 8.20 | 3.21 | 3.07 |
Phase D | 1.02 | 1.02 | 0.97 | 3.49 | 1.11 | 59.65 | 3.88 | 28.89 | 0.53 |
Table 2 Compositions of the matrix and precipitates precipitated in the inter-dendritic region measured by EPMA (at.%)
Element | V | Cr | Co | Ni | W | Nb | Mo | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
Matrix | 0.68 | 12.36 | 15.28 | 54.15 | 0.41 | 2.79 | 2.78 | 4.60 | 6.97 |
Phase A | 0.45 | 4.65 | 13.38 | 58.39 | 0.34 | 7.30 | 1.11 | 8.61 | 6.76 |
Phase B | 0.43 | 6.37 | 12.30 | 58.89 | 0.26 | 3.28 | 1.38 | 6.84 | 9.30 |
Phase C | 0.60 | 20.94 | 19.67 | 33.40 | 0.68 | 9.92 | 8.20 | 3.21 | 3.07 |
Phase D | 1.02 | 1.02 | 0.97 | 3.49 | 1.11 | 59.65 | 3.88 | 28.89 | 0.53 |
Fig. 3 TEM images and the corresponding selected area diffraction patterns of the precipitates in the as-cast ЭК151 alloy: aη phase at [2ˉ42ˉ32ˉ42ˉ3] zone axis; b eutectic (γ + γ′) at [112] zone axis; c Laves phase at [0001] zone axis; dMC-carbide at [112] zone axis
Element | V | Cr | Co | Ni | W | Nb | Mo | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
Inter-dendrites | 0.64 | 11.22 | 15.56 | 55.69 | 1.54 | 3.63 | 4.38 | 3.67 | 3.54 |
Dendrites | 0.77 | 12.06 | 17.04 | 56.79 | 2.86 | 1.30 | 3.67 | 1.95 | 3.55 |
k | 1.20 | 1.07 | 1.10 | 1.02 | 1.86 | 0.36 | 0.84 | 0.53 | 1.00 |
Table 3 Distribution and partition coefficients of the elements in the as-cast ЭК151 alloy (EPMA results, wt%)
Element | V | Cr | Co | Ni | W | Nb | Mo | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
Inter-dendrites | 0.64 | 11.22 | 15.56 | 55.69 | 1.54 | 3.63 | 4.38 | 3.67 | 3.54 |
Dendrites | 0.77 | 12.06 | 17.04 | 56.79 | 2.86 | 1.30 | 3.67 | 1.95 | 3.55 |
k | 1.20 | 1.07 | 1.10 | 1.02 | 1.86 | 0.36 | 0.84 | 0.53 | 1.00 |
Fig. 7 Images and the corresponding SAED patterns of the white particles in the alloy soaked at 1130 °C: a SEM image of white particles; b TEM image of white particles; c corresponding SAED patterns at [011] axis zone of particles; d TEM-EDS of the particles
Fig. 8 Microstructures of η phase and chilled morphology of eutectic Laves a and chilled morphology of eutectic (γ + γ′) b, c EDS spectrum of the eutectic Laves, d EDS spectrum of eutectic (γ + γ′)
Fig. 9 Microstructures of η phase and chilled morphology of eutectic Laves soaked at 1210 °C a and chilled morphology of η phase soaked at 1200 °C b, c EDS spectrum of the η phase soaked at 1210 °C, d EDS spectrum of η phase at 1200 °C
Fig. 10 Microstructures of as-cast ЭК151 superalloy soaked at 1250 °C for 10 min and then quenched in water for melting pools a and MC-carbide b, c EDS spectrum of the MC-carbide
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