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| AN EVALUATION OF LONG-TERM PERFORMANCE AND MICROSTRUCTURAL STABILITY OF A 35Ni-15Cr TYPE IRON-BASE SUPERALLOY WITH REDUCED Al+Ti CONTENT |
| Guo Jianting;Xu Jiaxun;An Wangyuan Institute of Metal Research; Academia Sinica Harbin Turbine Works |
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Cite this article:
Guo Jianting;Xu Jiaxun;An Wangyuan Institute of Metal Research; Academia Sinica Harbin Turbine Works. AN EVALUATION OF LONG-TERM PERFORMANCE AND MICROSTRUCTURAL STABILITY OF A 35Ni-15Cr TYPE IRON-BASE SUPERALLOY WITH REDUCED Al+Ti CONTENT. Acta Metall Sin, 1980, 16(4): 386-492.
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Abstract Four-year performance tests on creep and creep-rupture strength under vari-ous stress levels at 700℃ have been carried out for a modified 35Ni-15Cr iron-base superalloy with Al+Ti content reduced from 5 to 3%. It is shown that thehigh temperature properties of this alloy are superior to those of other superalloysof the same type such as ЭИ787, ЭИ437Б, Nimonic 80 and 80A, etc. It seemsthat such an alloy may meet the demands of turbine blade materials for longtime service at 700℃. However, microstructural observations showed that stressingpromotes phase transformation, e. g. γ' phase tends to coarsen directionally whileσ and Laves phases precipitate out much earlier. The results of room temperaturetensile tests after rupture exposure further confirm the acceptability of such alloyas gas turbine blade material for long-term uses.
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Received: 18 April 1980
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