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| INFLUENCE OF HOT CORROSION ON THE CREEP STRENGTH OF THE SUPERALLOY GH 37 |
| Zhang Yuanhu Yang Huiwen Lin Dongliang (Shanghai Jiaotong University; Shanghai; China) |
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Abstract The effect of hot corrosion on creep strength of the superalloy GH37 at 700℃ and 850℃ has been studied by comparing the results for both bare specimens and specimens coated with a salt mixture of 25％ NaCl and 75％ Na_2SO_4. Results show that the secondary creep rate increases and that the life of creep rupture and ductility decreases considerably with salt coated specimens. The effect of hot corrosion on creep strength of alloy at 700℃ is much more severe than that at 850℃, although the alloy is nearly unattacked at 700℃ by salt. Direct observation of fracture surface leads us to suggest that for the salt coated specimens the decrease of creep rupture life at 700℃ is due to the reduction, of the crack initiation time, while the reduction of the creep rupture life at 850℃ is due to the acceleration of creep crack growth rate. The creep strength of the alloy can be improved by means of Al-Cr diffusion coating on the specimen.
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Received: 25 August 1983
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[1] Goebel, J. A., Pettil, F. S., Goward, G. W., Met. Trans., 4, 261(1973)
[2] Bourhis, Y., St, John, C.. Oxidation of Metals, 9, 507 (1975)
[3] Floreen, S., Kane, R. H., Met. Trans., 10 A, 1745 (197(?)) |
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