J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (8): 1532-1542.DOI: 10.1016/j.jmst.2019.04.001
• Orginal Article • Previous Articles Next Articles
Y. Jiaoab, L.J. Huanga*(), S.L. Weic, H.X. Pengd, Q. Ana, S. Jianga, L. Genga
Received:
2018-09-03
Revised:
2018-11-03
Accepted:
2019-03-22
Online:
2019-08-05
Published:
2019-06-19
Contact:
Huang L.J.
About author:
1 These authors contributed equally to this work.
Y. Jiao, L.J. Huang, S.L. Wei, H.X. Peng, Q. An, S. Jiang, L. Geng. Constructing two-scale network microstructure with nano-Ti5Si3 for superhigh creep resistance[J]. J. Mater. Sci. Technol., 2019, 35(8): 1532-1542.
Fig. 2. Microstructure and schematic illustration of the composite. (a) millimeter-scale Ti6Al4V matrix; (b) Meso-scale TiBw network; (c) micro-scale Ti5Si3 network; (d) microstructural design concept of the composite.
Fig. 3. Creep strain versus time curves of the Ti6Al4V alloy and (Ti5Si3+TiBw)/Ti6Al4V composite at: (a) 550 °C/200 MPa; (b) 550 °C/250 MPa; (c) 550 °C/300 MPa; (d) 550 °C/350 MPa.
Materials | Ref. | Testing conditions | Steady state creep rate (s-1) | Creep rupture time (h) |
---|---|---|---|---|
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 550 °C/300 MPa | 1.48 × 10-7 | 89.0 |
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 550 °C/350 MPa | 3.71 × 10-7 | 36.0 |
Ti6Al4V | This work | 550 °C/300 MPa | 3.73 × 10-6 | 4.0 |
Ti5Al5Mo5V1Fe1Cr(TC18) | [ | 500 °C/300 MPa | 4.86 × 10-7 | 72.0 |
Hot-forged Ti6Al4V | [ | 500 °C/361 MPa | 9.64 × 10-7 | 28.2 |
Ti6.3Al1.6Zr3.4Mo0.3Si(TC11) | [ | 500 °C/300 MPa | 2.83 × 10-7 | - |
Ti6Al4V-0.11B | [ | 550 °C/300 MPa | 2.25 × 10-6 | 7.7 |
Ti6Al2Sn2Zr2Cr2Mo0.16Si(Ti62222S) | [ | 480 °C/350 MPa | - | 50.0 |
15 vol%TiCp/Ti6Al4V | [ | 550 °C/300 MPa | - | <1.0 |
8 vol%TiBw/Ti6Al4V | [ | 550 °C/300 MPa | 4.06 × 10-7 | 20.0 |
Table 1 Creep properties of various Ti alloys, conventional TMCs and (Ti5Si3+TiBw)/Ti6Al4V composite.
Materials | Ref. | Testing conditions | Steady state creep rate (s-1) | Creep rupture time (h) |
---|---|---|---|---|
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 550 °C/300 MPa | 1.48 × 10-7 | 89.0 |
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 550 °C/350 MPa | 3.71 × 10-7 | 36.0 |
Ti6Al4V | This work | 550 °C/300 MPa | 3.73 × 10-6 | 4.0 |
Ti5Al5Mo5V1Fe1Cr(TC18) | [ | 500 °C/300 MPa | 4.86 × 10-7 | 72.0 |
Hot-forged Ti6Al4V | [ | 500 °C/361 MPa | 9.64 × 10-7 | 28.2 |
Ti6.3Al1.6Zr3.4Mo0.3Si(TC11) | [ | 500 °C/300 MPa | 2.83 × 10-7 | - |
Ti6Al4V-0.11B | [ | 550 °C/300 MPa | 2.25 × 10-6 | 7.7 |
Ti6Al2Sn2Zr2Cr2Mo0.16Si(Ti62222S) | [ | 480 °C/350 MPa | - | 50.0 |
15 vol%TiCp/Ti6Al4V | [ | 550 °C/300 MPa | - | <1.0 |
8 vol%TiBw/Ti6Al4V | [ | 550 °C/300 MPa | 4.06 × 10-7 | 20.0 |
Fig. 4. Creep strain versus time curves of the Ti6Al4V alloy and (Ti5Si3+TiBw)/Ti6Al4V composite at 600 °C/200 MPa (a); 600 °C/250 MPa (b); comparison of stress versus rupture time at 600 °C (c) with data from Refs. [10,16,[26], [27], [28]].
Fig. 5. Creep strain versus time curves of the Ti6Al4V alloy and (Ti5Si3+TiBw)/Ti6Al4V composite at: (a) 650 °C/100 MPa; (b) 650 °C/150 MPa; (c) 650 °C/200 MPa; (d) 650 °C/250 MPa.
Materials | Ref. | Testing conditions | Steady state creep rate (s-1) | Creep rupture time (h) |
---|---|---|---|---|
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 150 MPa | 6.03 × 10-7 | 26.5 |
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 200 MPa | 2.91 × 10-6 | 5.5 |
8 vol%TiBw/Ti6Al4V | [ | 150 MPa | 2.55 × 10-6 | 14.0 |
Cast-forged P91 steel | [ | 150 MPa | 1.81 × 10-6 | 9.3 |
Cast-forged P91 steel | [ | 200 MPa | 4.64 × 10-5 | 0.4 |
Table 2 Creep properties of various TMCs and steels at 650 °C.
Materials | Ref. | Testing conditions | Steady state creep rate (s-1) | Creep rupture time (h) |
---|---|---|---|---|
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 150 MPa | 6.03 × 10-7 | 26.5 |
(4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V | This work | 200 MPa | 2.91 × 10-6 | 5.5 |
8 vol%TiBw/Ti6Al4V | [ | 150 MPa | 2.55 × 10-6 | 14.0 |
Cast-forged P91 steel | [ | 150 MPa | 1.81 × 10-6 | 9.3 |
Cast-forged P91 steel | [ | 200 MPa | 4.64 × 10-5 | 0.4 |
Fig. 6. Logarithmic plots of the steady-state creep rate versus the stress (a) and the reciprocal temperature (b); (c) threshold stresses compensation of Ti6Al4V alloy and (4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V composite.
Fig. 7. Interior microstructure of the (4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V composite (a and b) and the Ti6Al4V alloy (c and d) at 550 °C/250 MPa; the fractograph of the composite (e and f) and alloy (g and h) after creep test at 650 °C/250 MPa.
Fig. 8. TEM results taken from the (4 vol.%Ti5Si3+3.4 vol.%TiBw)/Ti6Al4V composite at 650 °C/250 MPa. (a) the high-angle annular dark-field (HAADF) scanning TEM (STEM) image; (b) the selected area electron diffraction pattern (SADP) of Ti5Si3; (c)-(g) TEM micrographs of dislocation configuration.
Fig. 9. High-angle annular dark-field (HAADF) scanning TEM (STEM) images of the (Ti5Si3+TiBw)/Ti6Al4V composite before (a-d) and after (e-g) creep test at 650 °C/250 MPa; The statistical size of Ti5Si3 particle within β phase before (h) and after (i) creep test.
Fig. 11. A schematic illustration of anti-creep mechanism of the (Ti5Si3+TiBw)/Ti6Al4V composite during creep test. (a) grain and phase boundary sliding; (b) dislocation piled-up upon grain and phase boundary region; (c) refined Ti5Si3 particle distributed at α/β interface.
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