Acta Metallurgica Sinica (English Letters) ›› 2017, Vol. 30 ›› Issue (7): 621-929.DOI: 10.1007/s40195-017-0583-6
• Orginal Article • Previous Articles Next Articles
Zheng-Guan Lu1,2, Jie Wu1, Rui-Peng Guo1,3, Lei Xu1(), Rui Yang1
Received:
2016-11-21
Revised:
2017-01-20
Online:
2017-07-20
Published:
2017-08-22
About author:
These authors contributed equally to this work.
Zheng-Guan Lu, Jie Wu, Rui-Peng Guo, Lei Xu, Rui Yang. Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti2AlNb Intermetallics[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(7): 621-929.
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Samples | O | N | H | Ar | Al | Nb | Mo | Ti |
---|---|---|---|---|---|---|---|---|
Powder | 0.069 | 0.0080 | 0.0050 | <0.0001 | 10.4 | 41.0 | 0.90 | Bal. |
Compacts | 0.068 | 0.014 | 0.0025 | <0.0001 | 10.6 | 41.3 | 0.90 | Bal. |
Table 1 Chemical composition and gas contents of Ti2AlNb powder and as-HIPed compacts (wt%)
Samples | O | N | H | Ar | Al | Nb | Mo | Ti |
---|---|---|---|---|---|---|---|---|
Powder | 0.069 | 0.0080 | 0.0050 | <0.0001 | 10.4 | 41.0 | 0.90 | Bal. |
Compacts | 0.068 | 0.014 | 0.0025 | <0.0001 | 10.6 | 41.3 | 0.90 | Bal. |
Rolling steps | Parameters |
---|---|
As-HIPed preforms | EIGA powder + HIPing, capsules removed Size: H0 = 150 mm, T0 = 75 mm, ED0 = 350 mm |
Heat preservation | Ceramic coatings + asbestos package |
Pre-heating | 23-1025 °C (5 °C/s), holding for 2 h |
The first pass rolling | 30 s |
Re-heating | 1025 °C, holding for 2 h |
The second pass rolling | 30 s |
Post-heating | Furnace cooling, HT (solution + aging treatment) |
Machining | Size: H1 = 150 mm, T1 = 55 mm, ED1 = 450 mm (30% deformation in T) Size: H2 = 150 mm, T2 = 30 mm, ED2 = 750 mm (60% deformation in T) |
Table 2 Parameters of ring rolling for PM Ti2AlNb ring preforms
Rolling steps | Parameters |
---|---|
As-HIPed preforms | EIGA powder + HIPing, capsules removed Size: H0 = 150 mm, T0 = 75 mm, ED0 = 350 mm |
Heat preservation | Ceramic coatings + asbestos package |
Pre-heating | 23-1025 °C (5 °C/s), holding for 2 h |
The first pass rolling | 30 s |
Re-heating | 1025 °C, holding for 2 h |
The second pass rolling | 30 s |
Post-heating | Furnace cooling, HT (solution + aging treatment) |
Machining | Size: H1 = 150 mm, T1 = 55 mm, ED1 = 450 mm (30% deformation in T) Size: H2 = 150 mm, T2 = 30 mm, ED2 = 750 mm (60% deformation in T) |
Fig. 9 Microstructures of as-HIPed (a), as-HIPed + rolled (b) Ti2AlNb alloy by EBSD analysis (blue color shows α2 phase, yellow color shows B2 phase, and green color shows O phase)
Vα2 (%) | VO (%) | VB2 (%) | |
---|---|---|---|
As-HIPed | 7.3 | 58.1 | 34.6 |
30% rolled | 5.6 | 22.6 | 71.8 |
Table 3 Phase distribution of PM Ti2AlNb alloy observed by EBSD analysis
Vα2 (%) | VO (%) | VB2 (%) | |
---|---|---|---|
As-HIPed | 7.3 | 58.1 | 34.6 |
30% rolled | 5.6 | 22.6 | 71.8 |
T (°C) | 0.2% YS (MPa) | UTS (MPa) | El (%) | |
---|---|---|---|---|
HIPed | 23 | 833 | 1034 | 8.0 |
650 | 545 | 715 | 15.5 | |
30% rolled | 23 | 1240 | 1365 | 5.0 |
650 | 835 | 1090 | 5.0 |
Table 4 Tensile properties of as-HIPed and as-HIPed + rolled Ti2AlNb alloys
T (°C) | 0.2% YS (MPa) | UTS (MPa) | El (%) | |
---|---|---|---|---|
HIPed | 23 | 833 | 1034 | 8.0 |
650 | 545 | 715 | 15.5 | |
30% rolled | 23 | 1240 | 1365 | 5.0 |
650 | 835 | 1090 | 5.0 |
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