Effect of Mg Treatment on the Nucleation and Ostwald Growth of Inclusions in Fe-O-Al-Mg Melt
Abstract
:1. Introduction
2. Experimental
Experimental Procedure
3. Measurement of Inclusions
4. Results and Discussion
4.1. Composition and Morphologies of Inclusion
4.2. Characteristics of Inclusions
5. Calculation
5.1. Calculated Nucleation Rate and Critical Size of Nuclei
5.2. Ostwald Growth
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Element | C | Si | Mn | P | S | Cr | Al | Cu | Ni | Ti | N |
---|---|---|---|---|---|---|---|---|---|---|---|
Content | 0.0016 | 0.0033 | 0.01 | 0.0053 | 0.0017 | 0.0107 | 0.003 | 0.0037 | 0.0038 | 0.001 | 0.0020 |
Deoxidizer | Holding Time | [O] | [Al] | [Mg] | |||
---|---|---|---|---|---|---|---|
Total | Sol. | Sol. | Insol. | Sol. | Insol. | ||
(Mass ppm) | (Mass ppm) | (Mass ppm) | (Mass ppm) | (Mass ppm) | (Mass ppm) | ||
0.05%Al | 120 s | 218 | 7.32 | 310 | 94 | - | - |
600 s | 90.9–92.8 | 3.6 | - | - | - | - | |
1800 s | 14.7–117 | 3.38 | 280 | 79 | - | - | |
0.05%Al+0.03%Mg | 120 s | 208 | 4.08 | 390 | 85 | 8–19 | - |
600 s | 162 | 3.44 | - | - | - | - | |
1800 s | 63 | 2.93 | 350 | 23 | 5 | - |
Element | C | Si | Mn | P | N | Al |
0.065[C pct] [27] | 0.026[Si pct] [28] | 0.05[Mn pct] [28] | 0.025[P pct] [28] | 5.585[N pct] [28] | 0.037[Al pct] [28] | |
Element | Cr | Cu | Ni | S | O | |
0.008[Cr pct] [28] | 0.026[Cu pct] [28] | 0.002[Ni pct] [28] | 0.2ln(1+330[pct S]) [29] | 0.279 ln(1+140[]) [30] |
Oxide | Θ (deg) | γSV (J/m2) | VO (m3/mol) |
---|---|---|---|
Al2O3 | 132 − 6.3ln(1 + 400[pctO])0.63ln(1 + 640[pctS]) [29] | 1.128 − 0.0001T [30] | 8.6 × 10−6 |
MgO | 117 − 7.4ln(1 + 720aO) (−15 < logaO < 9) [31] | 0.86 [32] | 11 × 10−6 |
MgAl2O4 | 105 [33] | 2.270 − 0.0006T [34,35] | 9.3 × 10−6 |
Equation | logKeq |
---|---|
Al2O3(s) = 2[Al] + 3[O] | −12.57 = (−45300/T + 11.62) [36] |
MgO(s) = [Mg] + [O] | −7.86 = (−38059/T + 12.45) [36] |
MgAl2O4(s) = [Mg] + 2[Al] + 4[O] | −21.28 = (−84339/T + 23.75) [36] |
C | Si | Mn | P | S | Cr | Cu | Ni | Ti | N | O | Al | Mg | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
O | −0.42 | −0.066 | −0.021 | 0.07 | −0.13 | −0.055 | −0.013 | 0.006 | −0.34 | −0.14 | −0.17 | −1.17 | −1.98 |
Al | 0.091 | 0.056 | −0.004 | 0.033 | 0.035 | 0.012 | −0.013 | −0.017 | - | 0.015 | −1.98 | 0.043 | −0.13 |
Mg | −0.31 | −0.088 | - | - | - | 0.047 | −0.012 | −0.64 | - | −3 | −0.12 | - |
Holding Time | [O] | [Al] | [Mg] | aO | aAl | aMg |
---|---|---|---|---|---|---|
120 s | 0.0218 | 0.0310 | 0 | 0.019783 | 0.028190 | 0 |
1800 s | 0.0046 | 0.0280 | 0 | 0.004237 | 0.027531 | 0 |
120 s | 0.0208 | 0.0390 | 0.0008−0.0019 | 0.018367 | 0.035641 | 0.001154 |
1800 s | 0.0063 | 0.0350 | 0.0005 | 0.005677 | 0.034167 | 0.000473 |
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Li, Y.; Wang, L.; Chen, C.; Li, J.; Li, X. Effect of Mg Treatment on the Nucleation and Ostwald Growth of Inclusions in Fe-O-Al-Mg Melt. Materials 2020, 13, 3355. https://doi.org/10.3390/ma13153355
Li Y, Wang L, Chen C, Li J, Li X. Effect of Mg Treatment on the Nucleation and Ostwald Growth of Inclusions in Fe-O-Al-Mg Melt. Materials. 2020; 13(15):3355. https://doi.org/10.3390/ma13153355
Chicago/Turabian StyleLi, Yutang, Linzhu Wang, Chaoyi Chen, Junqi Li, and Xiang Li. 2020. "Effect of Mg Treatment on the Nucleation and Ostwald Growth of Inclusions in Fe-O-Al-Mg Melt" Materials 13, no. 15: 3355. https://doi.org/10.3390/ma13153355