MICROSTRUCTURES AND THE STRUCTURE STABILITY OF INCONEL 725, A NEW AGE-HARDENABLE CORROSION RESISTANT SUPERALLOY
来源期刊：Acta Metallurgica Sinica2003年第2期
论文作者：S.K.Mannan J.X.Dong M.C.Zhang
Key words：superalloy; INCONEL725; microstructure; long-term exposure;
Abstract: INCONEL725 is a highly corrosion resistant nickel based alloy capable of being age-hardened to high strength levels. The microstructure observations and the phase iden-tification after a standard heat treatment were investigated. The results show thatmary carbide phase TiC, as well as M6C carbide and a little extent MC (mainly TiC)precipitates which nucleate mainly at grain boundaries. An isothermal aging studywas carried out on this alloy for up to 10 000 hours at 593℃. This additional agingdid not affect the tensile strength. However, microstructures show that the thermalexposure has a little additional effect. With increasing the exposure time, the size ofcipitated at grain boundaries have an increased and complex tendency on a few grainboundaries. The experimental results illustrate the excellent structure stability of theage-hardenable IN725 at 593℃.
S.K.Mannan1，J.X.Dong2，M.C.Zhang2
(1.Special Metals Corporation, Huntington, WV25705, USA;
2.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China)
Abstract:INCONEL725 is a highly corrosion resistant nickel based alloy capable of being age-hardened to high strength levels. The microstructure observations and the phase iden-tification after a standard heat treatment were investigated. The results show thatmary carbide phase TiC, as well as M6C carbide and a little extent MC (mainly TiC)precipitates which nucleate mainly at grain boundaries. An isothermal aging studywas carried out on this alloy for up to 10 000 hours at 593℃. This additional agingdid not affect the tensile strength. However, microstructures show that the thermalexposure has a little additional effect. With increasing the exposure time, the size ofcipitated at grain boundaries have an increased and complex tendency on a few grainboundaries. The experimental results illustrate the excellent structure stability of theage-hardenable IN725 at 593℃.
Key words:superalloy; INCONEL725; microstructure; long-term exposure;
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