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
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.
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.
[1] 铁基高温合金研究组,金属学报,14(1978) ,227． [2] #12 [3] #12 [4] Betteridge, W. and Heslop, J., The Nimonic Alloys and Other Nickel-Base High-Temperature Alloys, Edward Arnold, 1974, p. 243． [5] #12 [6] 铁基高温合金研究组,金属学报,14(1978) ,348． [7] Susukida, H., Sunamoto, D. and Sakumoto, Y., ASME Gas Turbine Conference and Products Show. 69-GT-12． 2--4． [8] 郭建亭,朱耀霄,师昌绪,金属学报,10(1974) ,74． [9] Webster, G. A. and Piearcey, B. J., Metal Sci. J., 1 (1967) , 97． [10] Sullivan, C. P., Webster, G. A. and Piearcey, B. J., J. Inst. Metals, 96 (1968) , 274． [11] Tien, J. K. and Copley, S. M., Met. Trans., 2 (1971) , 215． [12] Tien, J. K. and Copley, S. M., Met. Trans., 2 (1971) , 543． [13] 郭建亭,金属学报,16(1980) ,30． [14] Tien, J. K. and Gamble. R. P., Met. Trans.. 2 (1971) . 1663． [15] 西羲澈,特殊钢,17(1968) ,№5,59
