J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2439-2446.DOI: 10.1016/j.jmst.2018.04.001
• Orginal Article • Previous Articles Next Articles
Yao Wangab, Junsong Wangc, Jiasheng Donga*(), Aimin Lid, Zhijun Lie, Guang Xieab, Langhong Louaa
Received:
2017-08-16
Revised:
2017-09-18
Accepted:
2017-09-18
Online:
2018-12-20
Published:
2018-11-15
Contact:
Dong Jiasheng
Yao Wang, Junsong Wang, Jiasheng Dong, Aimin Li, Zhijun Li, Guang Xie, Langhong Loua. Hot deformation characteristics and hot working window of as-cast large-tonnage GH3535 superalloy ingot[J]. J. Mater. Sci. Technol., 2018, 34(12): 2439-2446.
Mo | Cr | Fe | Mn | Si | Co | C | Ni |
---|---|---|---|---|---|---|---|
16.3 | 6.99 | 4.29 | 0.7 | 0.46 | 0.019 | 0.044 | Bal |
Table 1 Chemical compositions (wt.%) of the GH3535 alloy.
Mo | Cr | Fe | Mn | Si | Co | C | Ni |
---|---|---|---|---|---|---|---|
16.3 | 6.99 | 4.29 | 0.7 | 0.46 | 0.019 | 0.044 | Bal |
Fig. 2. Typical true stress-strain curves of GH3535 alloy responding to high-temperature compression in different deformation conditions at a strain of 0.8.
Fig. 3. Relationship curves between hot working parameters of the present GH3535 alloy: The correlations of ln $\dot{\varepsilon}$ vs. and vs. 1/T were drawn in Fig. 3(c) and (d), respectively. The hot deformation activation energy (HDAE) Q was thus determined to be 483.22?kJ/mol.
Fig. 5. DRX distribution map of GH3535 alloy with initial coarsened grains at a strain of 0.8. And microstructure observations of samples compression deformed in the selected hot deformation parameters.
Fig. 8. Schematic diagram of hot working windows for the current GH3535 alloy. The present domains are mainly divided on the basis of above discussed processing maps and high-temperature deformed microstructures.
Fig. 9. Photographs of hot working processes of large-tonnage GH3535 alloy ingot: (a) employed parameter region in the extended optimized hot working window, (b) billet forging of homogenized ingot, (c) ring rolling of hot billet, (d) as-received raw ring with a dimension of outer diameter 3010?mm, inner diameter 2872?mm and height 410?mm.
Fig. 10. Microstructures of the depth 80?mm to the upper surface of large-size GH3535 alloy ring: (a) the site locating the outer surface of the ring, (b) the site locating the inside surface of the ring.
Test | Condition | YS (MPa) | UTS (MPa) | Lifetime (h) | Elongation (%) |
---|---|---|---|---|---|
tensile | 650?°C/10-3?s-1 | 206; 214; 218 | 555; 559; 572 | - | 44.9; 45.6; 45.5 |
700?°C/10-3?s-1 | 203; 207; 215 | 515; 522; 532 | - | 53.3; 52.7; 53.5 | |
rupture | 650?°C/324?MPa | - | - | 198; 197; 202 | 32.1; 30.8; 30.2 |
700?°C/240?MPa | 146; 152; 136 | 49.7; 55.1; 58.3 |
Table 2 Mechanical properties of the large-size GH3535 superalloy ring.
Test | Condition | YS (MPa) | UTS (MPa) | Lifetime (h) | Elongation (%) |
---|---|---|---|---|---|
tensile | 650?°C/10-3?s-1 | 206; 214; 218 | 555; 559; 572 | - | 44.9; 45.6; 45.5 |
700?°C/10-3?s-1 | 203; 207; 215 | 515; 522; 532 | - | 53.3; 52.7; 53.5 | |
rupture | 650?°C/324?MPa | - | - | 198; 197; 202 | 32.1; 30.8; 30.2 |
700?°C/240?MPa | 146; 152; 136 | 49.7; 55.1; 58.3 |
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