J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (12): 1487-1493.DOI: 10.1016/j.jmst.2017.08.001
• Orginal Article • Previous Articles Next Articles
Antonio Jiménez José*(), Carsí Manuel, Antonio Ruano Oscar
Received:
2016-10-27
Revised:
2016-12-20
Accepted:
2017-01-29
Online:
2017-12-20
Published:
2018-01-30
Contact:
Antonio Jiménez José
Antonio Jiménez José, Carsí Manuel, Antonio Ruano Oscar. Effect of rhenium on the microstructure and mechanical behavior of Fe-2.25Cr-1.6W-0.25V-0.1C bainitic steels[J]. J. Mater. Sci. Technol., 2017, 33(12): 1487-1493.
Steel | Cr | W | Re | Mn | Si | V | Mo | Nb | C |
---|---|---|---|---|---|---|---|---|---|
T/P23 | 2.25 | 1.6 | - | 0.5 | 0.3 | 0.25 | 0.1 | 0.05 | 0.1 |
T/P23Re | 2.25 | 1.6 | 1.5 | 0.5 | 0.3 | 0.25 | 0.1 | - | 0.1 |
Table 1 Chemical compostion of the steels studied (mass%, Bal. Fe).
Steel | Cr | W | Re | Mn | Si | V | Mo | Nb | C |
---|---|---|---|---|---|---|---|---|---|
T/P23 | 2.25 | 1.6 | - | 0.5 | 0.3 | 0.25 | 0.1 | 0.05 | 0.1 |
T/P23Re | 2.25 | 1.6 | 1.5 | 0.5 | 0.3 | 0.25 | 0.1 | - | 0.1 |
Phase | Fe | Cr | W | Mn | Si | V | Mo | Nb | C |
---|---|---|---|---|---|---|---|---|---|
Ferrite | 96.3 | 2.0 | 0.7 | 0.5 | 0.3 | 0.1 | 0.1 | - | - |
MC | 5.0 | 5.3 | 22.2 | - | - | 49.5 | 0.6 | 3.9 | 13.5 |
M6C | 26.1 | 1.1 | 67.7 | - | - | 1.3 | 1.7 | 0.3 | 1.8 |
NbC | 0.6 | 6.6 | 2.1 | - | - | 3.9 | - | 74.9 | 11.9 |
M23C6 | 35.7 | 34.4 | 21.1 | 1.3 | - | 1.0 | 1.9 | - | 4.6 |
Table 2 Calculated composition of phases in equilibrium at 700 °C for the ASTM T/P23 steel (mass%).
Phase | Fe | Cr | W | Mn | Si | V | Mo | Nb | C |
---|---|---|---|---|---|---|---|---|---|
Ferrite | 96.3 | 2.0 | 0.7 | 0.5 | 0.3 | 0.1 | 0.1 | - | - |
MC | 5.0 | 5.3 | 22.2 | - | - | 49.5 | 0.6 | 3.9 | 13.5 |
M6C | 26.1 | 1.1 | 67.7 | - | - | 1.3 | 1.7 | 0.3 | 1.8 |
NbC | 0.6 | 6.6 | 2.1 | - | - | 3.9 | - | 74.9 | 11.9 |
M23C6 | 35.7 | 34.4 | 21.1 | 1.3 | - | 1.0 | 1.9 | - | 4.6 |
T/P23 steel | T/P23Re steel | |||
---|---|---|---|---|
Stress (MPa) | Minimum creep rate (s-1) | Time to failure (h) | Minimum creep rate (s-1) | Time to failure (h) |
300 | 2.5 × 10-8 | 62 | 2.0 × 10-8 | 202 |
250 | 1.0 × 10-8 | 304 | 5.9 × 10-9 | 732 |
200 | 4.1 × 10-9 | 873 | 2.9 × 10-9 | 1642 |
Table 3 Results of the iso-stress rupture tests performed at 600 °C for the T/P 23 and T/P 23 Re steels.
T/P23 steel | T/P23Re steel | |||
---|---|---|---|---|
Stress (MPa) | Minimum creep rate (s-1) | Time to failure (h) | Minimum creep rate (s-1) | Time to failure (h) |
300 | 2.5 × 10-8 | 62 | 2.0 × 10-8 | 202 |
250 | 1.0 × 10-8 | 304 | 5.9 × 10-9 | 732 |
200 | 4.1 × 10-9 | 873 | 2.9 × 10-9 | 1642 |
Fig. 6. Dependence of steady state creep on stress for T/P23 and T/P23-Re steels at 600 °C; open symbols at low stresses are data obtained from tensile creep tests and data with closed symbols were obtained from compression strain-rate-change tests.
Fig. 9. EBSD orientation maps for T/P 23 steel after tempering at 700 °C for 1 h (a) and after tensile creep tests at 300 MPa at 600 °C (b) and 200 MPa at 600 °C (c).
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