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| HIGH TEMPERATURE CORROSION OF THE RENE 80 SUPERALLOY WITH DIFFERENT MICROSTRUCTURES IN THE SULFUR-CONTAINING ATMOSPHERE UNDER APPLIED LOAD |
| Sun Jian; Zang Yuanhu and Hu Gengxiang (Shanghai Jiao Tong University) |
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Abstract The high temperature corrosion behaviour in SO_2-contaminated atmosphere of Rene 80 superalloy with two different microstructures, i.e. equiaxed-grain structure by conventional casting (C. C.) or columnar-grain by directional solidification (D. S.) was studied. Analysis were carried out on the longitudinal sections and fracture surfaces of the tested specimens by SEM, EDAX and EPA. Similar tests were also conducted in air in order to compare with the results in SO_2-containing atmosphere. The results showed that severe sulphidation-oxidation corrosion along the grain boundaries of the conventional-cast Rene 80 alloy occurred in SO_2-containing environment, which led to premature failure of the alloy. However, owing to the elimination of transverse grain boundaries, the sulphidation-oxidation corrosion of the directionally solidified superalloy was hardly observed, and the rupture life of the alloy in SO_2-containing environment kept the same level as that in air. It is suggested that the damage of the superalloy in corrosive environment at high temperature under applied load was due to the interaction of high temperature corrosion-creep and mierostructure of the superalloy.
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Received: 25 June 1992
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Cite this article:
Sun Jian; Zang Yuanhu and Hu Gengxiang (Shanghai Jiao Tong University). HIGH TEMPERATURE CORROSION OF THE RENE 80 SUPERALLOY WITH DIFFERENT MICROSTRUCTURES IN THE SULFUR-CONTAINING ATMOSPHERE UNDER APPLIED LOAD. J Chin Soc Corr Pro, 1992, 12(3): 235-240.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I3/235
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[4] Hocking. M. G,Sidky, P. S, Corrosion Science, 27, 205(1987) |
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