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| EFFECT OF HOT SALT CORROSION ON CREEP RUPTURE BEHAVIOUR OF A Ni-BASE SUPERALLOY |
| WEI Xiangyun; HAO Huiqing; XIAO Yaotian (Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 20 November; 1982; revised manuscript 22 March; 1983) |
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Cite this article:
WEI Xiangyun; HAO Huiqing; XIAO Yaotian (Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 20 November; 1982; revised manuscript 22 March; 1983). EFFECT OF HOT SALT CORROSION ON CREEP RUPTURE BEHAVIOUR OF A Ni-BASE SUPERALLOY. Acta Metall Sin, 1984, 20(5): 365-370.
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Abstract A study was made of the corrosive effect of hot salt mixed by Na_2SO_4 and NaCl on the creep rupture life of a Ni-base superalloy. It was shown that for such superaUoy the rupture life is shortened, the rupture elongation is reduced and the creep rupture curve is shifted toward the left when its specimens coated with a mixture of 75% Na_2SO_4 and 25% NaCl layer and heated under testing temperatures of 750 and 800℃. No marked influence upon their creep rupture lifes of specimens seems to be resulted either with 90% Na_2SO_4+10% NaCl under 750℃ or with 95% Na_2SO_4+5% NaCl under 800℃. The susceptibility of the superalloy to hot salt corrosion is increased by treatment of electrolytic polishing. Observations under metalloscope, SEM and EMPA revealed that the effect of the hot salt corrosion on the creep rupture life of the superalloy is substantially due to destroying of the protective oxide film on its surface, and then caused by oxidization along the grain boundaries under stress applied. Hence, the harmfulness of this corrosion effect may be concerned with the surface condition, salt composition and stress applied at elevated temperatures.
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Received: 18 May 1984
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1 Betz, W. , High Temperature Alloys for Gas Turbines, Eds. Coutsouradis, D. et al. , Appl. Sci. Publ. , London, 1978, p. 409．
2 王嘉敏,未发表资料,1981．
3 吉葉正行;宫川大海;藤代大;防食技术,31(1982) ,187． |
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