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| MICROSTRUCTURES AND THE STRUCTURE STABILITY OF INCONEL 725,A NEW AGE—HARDENABLE CORROSION RESISTANT SUPERALLOY |
| J.X.Dong[1], M.C.Zhang[1], S.K.Mannan[2] |
| [1]SchoolofMaterialsScienceandEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China [2]SpecialMetalsCorporation,Huntington,WV25705,USA |
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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 investiguted.The results show that the precipitation phases include the strengthening phases γ′，γ″and δ phase,pri-mary carbide phase TiC,as well as M6C corbide and a little extent MC(mainly TiC) precipitates which nucleate mainly at grain boundaries.An isothermal aging study was carried out on this alloy for up to 10000 hours at 599℃.This additional aging did not affect the tensile strength.However,microstructures show that the thermal exposure has a little additional effect.With increasing the exposure time,the size of γ″ phase slightly increases,almost no change for γ′ phase,while M6C carbides pre-cipitated at grain boundaries have an increased and complex tendency on a few grain boundaries.The experimental results illustuate the excellent structure stability of the age-hardenable IN725 at 599℃.
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Received: 09 March 2002
Published: 10 October 2009
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Corresponding Authors:
J.X. Dong
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