EFFECTS OF Nb/Ti+ Nb MICRO  ALLOYING ON 900℃  TENSILE  PROPERTIES OF ALLOYGH652

Abstract

Abstract: Theeffectsof Nband Ti+ Nb microalloyingon mechanicalpropertiesand rupturelifeunder900 ℃ tensiletest on alloy GH652 were studied. Among theoriginalalloy GH652 and its Nb/ Ti+ Nb microalloyed alloys, the Ti+ Nb microalloyed alloy exhibited optimum com bined900℃ tensilestrength and plasticity and longer 900℃ 49 MPa prolonged tensile rup turelife as well. The role of refractory alloying elementscould be effectively brought intoplay with highertemperaturesolution treatment. Coordination strengthening of Matrix andgrain boundary wasthekeyfactoroflifetimeextension andthe mobilityof dislocationsinthematrix wasresponsableforthe plasticity ofthe micro alloyedsamples.

Key words: GH652 Nb/ Ti+ Nb micro alloying, 900 ℃ tensile properties, rupture life, alloy

Z.F.Peng1) ,Y.Y.Ren1) , Q.S. Mei1) ,Y.Q.Wang2) ,X.Y.Zhang2) and M.S.Ye2) 1) Department of Materials Engineering, Wuhan University of Hydraulic and Electric Engineering , Wuhan430072 ,China 2) Department of Superalloys,CentralIron and Steel Research Institute,Beijing430072 ,100081 China. EFFECTS OF Nb/Ti+ Nb MICRO ALLOYING ON 900℃ TENSILE PROPERTIES OF ALLOYGH652[J]. Acta Metallurgica Sinica (English Letters), 1999, 12(4): 436-441.

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EFFECTS OF Nb/Ti+ Nb MICRO ALLOYING ON 900℃ TENSILE PROPERTIES OF ALLOYGH652

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