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| MECHANICAL PROPERTIES AND MICROSTRUCTURE VARIATION OF AN Fe-Ni-Cr SUPERALLOY ON PROLONGED EXPOSURE |
| XIAO Yaotian; YANG Qibin; FAN Cungan; HEI Zukun(Institute of Metal Research; Academia Sinica; Shenyang) |
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Cite this article:
XIAO Yaotian; YANG Qibin; FAN Cungan; HEI Zukun(Institute of Metal Research; Academia Sinica; Shenyang). MECHANICAL PROPERTIES AND MICROSTRUCTURE VARIATION OF AN Fe-Ni-Cr SUPERALLOY ON PROLONGED EXPOSURE. Acta Metall Sin, 1983, 19(2): 13-146.
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Abstract A study was made of the correlation between the mechanical properties and the microstructure variation of an Fe-Ni-Cr base superalloy on prolonged heat exposure. It was found that the notch sensitivity of the alloy is closely related to TiC film precipitated along grain boundaries. With raising temperature and prolonging time of aging treatment, the TiC films coarsen gradually into block so that the notch sensitivity vanished from the alloy. Because of the minute block-shaped σ-phase is distributed along the grain boundaries, the high temperature tensile elongation and the rupture toughness of the alloy as well as its notch sensitivity ilimination could be improved. However, its room temperature tensile elongation and impact ductility are reduced, yet no great harm was influenced upon them as compared with the same contents of TiC and boride.
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Received: 18 February 1983
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