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《Acta Metallurgica Sinica》 2012-11
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EFFECTS OF Ti AND Al CONTENTS ON THE PRECIPITATION BEHAVIOR OFηPHASE IN Fe-Ni BASE ALLOYS

CHEN Shenghu,ZHAO Mingjiu,RONG Lijian Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016  
Fe-Ni base austenitic alloys have been widely used as structural materials in the hydrogen environment,which is strengthened by the precipitation ofγ'[Ni_3(Al,Ti)].ηphase is present after solution treatment in some modified alloys,which is detrimental to hydrogen resistance performance of alloys.In order to eliminate theηphase and optimize the alloy composition,the precipitation behavior ofηphase 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 ofηphase 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 ofηphase.Moreover,theηphase does not exist in alloys with the lower(Ti +A1)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 theηphase precipitates at the expense of theγ'phase existing at higher temperature.In situ microstructure observations indicate thatηphase and elemental segregation can be eliminated by the optimization of solution treatment condition.
【Fund】: 国家自然科学基金项目51171178和u1230118资助~~
【CateGory Index】: TG131
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