Forgeabilité des aciers inoxydables austéno-ferritiques

tel-00672279, version 1 - 21 Feb 2012
Chapter II. STATE OF THE ART 29
The values reported by different authors for the coefficients in this equation are summarized in Table
II.1.
The influence of both variables (temperature and strain rate) is very important because, under any
deformation mode, they are the two factors which can be modified in order to improve the hot ductility.
Ref n α A (s) QHW (kJ/mol) Material Deformation Mode
[25]
4.2 0.0139 7.12 10 16 450
2304, 77% hot rolled
Plane Strain Compression
4 0.0143 6.2 10 21 578 Torsion
[26] 3.85 0.008 3.54 10 14 380 2205, as-cast Plane Strain Compression
[27] 6.9 0.009 1.5 10 22 569 2205, bar
4 0.007 2.3 10 16 438 2507, bar
Uni-axial Compression
[28] 3.75 425 2205, 80% hot rolled Torsion
[29]
5.63 0.012 1.0 10 20 525 2304, hot rolled
3.8 0.012 1.0 10 15 394 2205, hot rolled
Torsion
[30] 4.18 0.01 3.95 10 15 400 27.6Cr-4.25Ni-1.3Mo-0.14N, bar Torsion
[31] 3.77 0.0115 2.68 10 16 447 2507, bar Torsion
[32]
380
Torsion
2205, hot rolled
360 Tension
[33] 4.07 0.015 2.04 10 19 488 26.5Cr-4.9Ni-1.63Mo-0.04N Torsion
[34] 4.9 0.014 8.1 10 14 430 2205, bar Tension
[35]
4.2 0.012 2.0 10 16 432 2205, hot rolled
3.64 0.0103 6.32 10 12 310 Ferritic with duplex ferrite composition
4.57 0.0066 1.44 10 15 454 Austenitic with duplex austenite
composition
Uni-axial Compression
[36] 5.1 0.012 2.14 10 21 479 2205, hot rolled Uni-axial Compression
[37] 2.6 0.012 2.7 10 10 263 2304, hot rolled Uni-axial Compression
[38] 4 0.012 474 2205, hot rolled Torsion
[39]* 5.8 0.0091 3.19 10 15 450 Austenitic 304 Plane Strain Compression
[40]* 3.1 0.0115 261 Ferritic Plane Strain Compression
Table II.1. Values reported by different authors for the parameters of the constitutive equations.
*More data in [41].