Acta Metallurgica Sinica (English Letters) ›› 2018, Vol. 31 ›› Issue (4): 401-414.DOI: 10.1007/s40195-017-0657-5
Special Issue: 2018年钢铁材料专辑
• Orginal Article • Previous Articles Next Articles
Yan-Sen Hao1(), Wan-Chun Liu1, Zhen-Yu Liu1
Received:
2017-09-26
Revised:
2017-09-26
Online:
2018-04-20
Published:
2018-03-25
Yan-Sen Hao, Wan-Chun Liu, Zhen-Yu Liu. Microstructure Evolution and Strain-Dependent Constitutive Modeling to Predict the Flow Behavior of 20Cr-24Ni-6Mo Super-Austenitic Stainless Steel During Hot Deformation[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(4): 401-414.
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C | P | S | N | Si | Cu | Mn | Ni | Cr | Mo | Fe |
---|---|---|---|---|---|---|---|---|---|---|
≤ 0.03 | ≤ 0.04 | ≤ 0.03 | 0.215 | 0.354 | 0.684 | 0.452 | 22.4 | 19.4 | 6.65 | Bal. |
Table 1 Chemical composition of investigated alloy (wt%)
C | P | S | N | Si | Cu | Mn | Ni | Cr | Mo | Fe |
---|---|---|---|---|---|---|---|---|---|---|
≤ 0.03 | ≤ 0.04 | ≤ 0.03 | 0.215 | 0.354 | 0.684 | 0.452 | 22.4 | 19.4 | 6.65 | Bal. |
Temperature (°C) | 950 | 1000 | 1050 | 1100 | 1150 |
---|---|---|---|---|---|
Specific heat (J kg-1 K-1) | 645.2 | 649.9 | 654.6 | 659.2 | 663.9 |
Table 2 Values of specific heat of 20Cr-24Ni-6Mo SASS
Temperature (°C) | 950 | 1000 | 1050 | 1100 | 1150 |
---|---|---|---|---|---|
Specific heat (J kg-1 K-1) | 645.2 | 649.9 | 654.6 | 659.2 | 663.9 |
Fig. 6 Schematic diagrams of processing methods for adiabatic heating correction: a linear relationship; b nonlinear relationship between temperature and true stress
Strain rate (s-1) | Temperature (°C) | ||||
---|---|---|---|---|---|
950 | 1000 | 1050 | 1100 | 1150 | |
0.01 | 1.205 | 1.204 | 1.219 | 1.205 | 1.218 |
0.1 | 1.256 | 1.197 | 1.197 | 1.191 | 1.205 |
1 | 1.137 | 1.218 | 1.205 | 1.183 | 1.455 |
10 | 1.147 | 1.160 | 1.122 | 1.191 | 1.218 |
Table 3 Values of barreling coefficient B of investigated specimens
Strain rate (s-1) | Temperature (°C) | ||||
---|---|---|---|---|---|
950 | 1000 | 1050 | 1100 | 1150 | |
0.01 | 1.205 | 1.204 | 1.219 | 1.205 | 1.218 |
0.1 | 1.256 | 1.197 | 1.197 | 1.191 | 1.205 |
1 | 1.137 | 1.218 | 1.205 | 1.183 | 1.455 |
10 | 1.147 | 1.160 | 1.122 | 1.191 | 1.218 |
Fig. 10 Evaluation of values of a n1 by plotting lnσ versus ln$\dot{\varepsilon}$; b β by plotting σ versus ln$\dot{\varepsilon}$; c n by plotting ln[sinh(ασ)] versus lnε˙; d Q by plotting ln[sinh(ασ)] versus 10,000/T; e lnA by plotting lnZ versus ln[sinh(ασ)] at strain of 0.45
α | n | Q | ln A |
---|---|---|---|
C 1 = 141.90078 | D 1 = 403.44852 | E 1 = 22,385.8426 | F 1 = 2006.36665 |
C 2 = 1895.0011 | D 2 = 6369.08584 | E 2 = 318,032.5293 | F 2 = 28,783.30076 |
C 3 = 13,299.762 | D 3 = 48,827.5076 | E 3 = 2.2817 × 106 | F 3 = 207,530.3504 |
C 4 = 54,875.835 | D 4 = 214,080.063 | E 4 = 9.4742 × 106 | F 4 = 864,381.2256 |
C 5 = 137,933.421 | D 5 = 562,823.928 | E 5 = 2.3728 × 107 | F 5 = 2.1693 × 106 |
C 6 = 207,593.649 | D 6 = 877,220.454 | E 6 = 3.5396 × 107 | F 6 = 3.2409 × 106 |
C 7 = 171,871.903 | D 7 = 747,109.433 | E 7 = 2.8998 × 107 | F 7 = 2.6579 × 106 |
C 8 = 60,182.7957 | D 8 = 267,789.971 | E 8 = 1.0053 × 107 | F 8 = 922,130.2720 |
Table 4 Polynomial coefficients of α, n, Q, and ln A for investigated alloy
α | n | Q | ln A |
---|---|---|---|
C 1 = 141.90078 | D 1 = 403.44852 | E 1 = 22,385.8426 | F 1 = 2006.36665 |
C 2 = 1895.0011 | D 2 = 6369.08584 | E 2 = 318,032.5293 | F 2 = 28,783.30076 |
C 3 = 13,299.762 | D 3 = 48,827.5076 | E 3 = 2.2817 × 106 | F 3 = 207,530.3504 |
C 4 = 54,875.835 | D 4 = 214,080.063 | E 4 = 9.4742 × 106 | F 4 = 864,381.2256 |
C 5 = 137,933.421 | D 5 = 562,823.928 | E 5 = 2.3728 × 107 | F 5 = 2.1693 × 106 |
C 6 = 207,593.649 | D 6 = 877,220.454 | E 6 = 3.5396 × 107 | F 6 = 3.2409 × 106 |
C 7 = 171,871.903 | D 7 = 747,109.433 | E 7 = 2.8998 × 107 | F 7 = 2.6579 × 106 |
C 8 = 60,182.7957 | D 8 = 267,789.971 | E 8 = 1.0053 × 107 | F 8 = 922,130.2720 |
Fig. 13 SEM microstructures of specimens deformed at 950 °C with strain rates of a 0.01 s-1; b 0.1 s-1; c 10 s-1; d precipitate morphology by TEM at 950 °C, 0.01 s-1, and corresponding results of e EDX, f SAED (GB grain boundary)
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