EFFECTS OF Ti AND Al CONTENTS ON THE PRECIPITATION BEHAVIOR OF η PHASE IN Fe-Ni BASE ALLOYS
Received date: 2012-04-26
Revised date: 2012-07-20
Online published: 2012-11-11
Supported by
Supported by National Natural Science Foundation of China (Nos.51171178 and u1230118)
Fe-Ni base austenitic alloys have been widely used as structural materials in the hydrogen environment, which is strengthened by the precipitation of γ' [Ni3(Al, Ti)]. η phase is present after solution treatment in some modified alloys, which is detrimental to hydrogen resistance performance of alloys. In order to eliminate the $\eta$ phase and optimize the alloy composition, the precipitation behavior of η phase in Fe-Ni base alloys with different Ti and Al contents was investigated in the range of 900 ℃ to 1030 ℃ using OM, SEM, TEM and EPMA. The results show that the formation ability of η phase is related to the content of Ti and Al. Increasing the (Ti+Al) content or the Ti/Al ratio in the alloys promotes the precipitation of η phase. Moreover, the η phase does not exist in alloys with the lower (Ti +Al) content or Ti/Al ratio, but still presents in the alloys with higher (Ti+Al) content and Ti/Al ratio after the standard solution treatment at 980 ℃, which is due to that the η phase precipitates at the expense of the γ' phase existing at higher temperature. In situ microstructure observations indicate that η phase and elemental segregation can be eliminated by the optimization of solution treatment condition.
Key words： Fe-Ni base alloy; η phase; solution treatment; precipitation behavior
CHEN Shenghu ZHAO Mingjiu RONG Lijian . EFFECTS OF Ti AND Al CONTENTS ON THE PRECIPITATION BEHAVIOR OF η PHASE IN Fe-Ni BASE ALLOYS[J]. Acta Metall Sin, 2012 , 48(11) : 1335 -1341 . DOI: 10.3724/SP.J.1037.2012.00232
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