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| EFFECT OF MICROSTRUCTURE ON MECHANICAL PROPERTIES OF AN IRON-BASE SUPERALLOY AFTER 750℃ PROLONGED EXPOSURE |
| JIANG Xiaoxia; XIAO Yaotian; ZHAO Hongxing; WEI Xianyun(Institute of Metal Research; Academia Sinica; Shenyang) |
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Cite this article:
JIANG Xiaoxia; XIAO Yaotian; ZHAO Hongxing; WEI Xianyun(Institute of Metal Research; Academia Sinica; Shenyang). EFFECT OF MICROSTRUCTURE ON MECHANICAL PROPERTIES OF AN IRON-BASE SUPERALLOY AFTER 750℃ PROLONGED EXPOSURE. Acta Metall Sin, 1983, 19(1): 18-136.
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Abstract The effect of microstructure on mechanical properties of an iron-base superalloy after prolonged exposure at 750℃ has been investigated by means of mechanical properties test, phase analysis, X-ray or electron diffraction, EDS and, especially, SEM observation on 3-dimensional morphology of the phases precipitated. After an exposure up to 200h, the high temperature strength and plasticity of the alloy are still satisfactory. The γ'-phase remained stable till 1000 h aging. The σ-phase was found as needle-like precipitates as a result of 500 h exposure, and it was then grown into plates, accompanied with the precipitation of Laves- or μ-phase after aged for 2000 h. As the exposure went on, TiC became the Lavesphase. It is regarded that the precipitation of the needle-like σ-phase is contributable to the decending of the high temperature endurance of the alloy aged for 200h, however, its high temperature plasticity and stress-rupture are little affected.
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Received: 18 January 1983
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