Acta Metall Sin  2005, Vol. 41 Issue (6): 622-626     DOI:

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Effects of Boron Content on Boundaries Precipitates in Ni Base Alloy GH4049 and Its High Temperature Properties

CHEN Guosheng; JIN Xin; ZHOU Dianhua; WANG Shipu; XIE Wei; WANG Lintao

Special Steel Technical Center; Baosteel Group; Shanghai 200940

CHEN Guosheng; JIN Xin; ZHOU Dianhua; WANG Shipu; XIE Wei; WANG Lintao. Effects of Boron Content on Boundaries Precipitates in Ni Base Alloy GH4049 and Its High Temperature Properties. Acta Metall Sin, 2005, 41(6): 622-626 .

Abstract References Related Articles Recommended Metrics Download:  PDF(330KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Characteristics of the secondary precipitates on grain surfaces connected with segregation of boron and carbon elements in a Ni-15Co-10Cr-5.5W-5Mo-4.2Al-1.5Ti alloy (GH4049) were studied by using extraction carbon replica method. When B content was below 0.008\%, or the solid-solutioned B/C atom ratio was decreased to about 0.365, the high temperature ductility and stress rupture life were reduced because large MC films, dendritic flake M6C and fine M23C6 films precipitated at grain boundaries. When B contents were 0.011% and 0.018\%, or the solid-solutioned B/C atom ratios were 0.667 and 0.941, the amounts of these carbides were decreased or their precipitates were refrained, but particles M3B2 precipitated, which improves the high temperature properties markedly. When B content was excessively high, M3B2 particles precipitated densely, resulting in the decrease of high temperature properties. If decreasing the cooling rate after solution, B and C atoms can diffuse at long distance, which promotes the precipitate of M3B2 particles at grain boundaries, improves the morphology of MC, and depresses the precipitations of M6C and M23C6. Key words:  Ni base superalloy      boron      precipitate at grain boundary       Received:  19 October 2004      ZTFLH:  TG146.1   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors CHEN Guosheng JIN Xin ZHOU Dianhua WANG Shipu XIE Wei WANG Lintao URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I6/622 [1]Franzoni U,Marchetti F,Sturlese S.Scr Metall,1985;19:511 [2]Cao W D,Kennedy R L.In:Kissinger R D,Deye D.J.Anton D L,Cetel A D,Nathal M V,Pollock T M,Wood-ford D A,eds.,Superalloys 1996,Warrendale,PA:TMS AIME,1996:589 [3]Kennedy R L,Cao W D,Thomas W M.Adv Mater Process,1996;149(3):33 [4]Gorokhov V P,Kolachev B A,Parfenova O A,Novikova M B.Metall Heat Treat Met,2003;(4):22 [5]Letellier L,Chambreland S,Duval P.Appi Surf Sci,1993;67:305 [6]Letellier L,Guttmann M,Blavette D.Philos Mag Lett,1994;70:189 [7]Horton J A,McKamey C G,Miller M K,Cao W D,Kennedy R L.In:Loria E A,ed.,Superalloys 718,625,706 and Various Derivatives,Warrendale,PA:TMS AIME,1997:401 [8]Lemarchand D,Cadel E,Chambreland S,Blavette D.Philos Mag,2002;82A:1651 [9]Miller M K,Anderson I M,Pike L M,Klarstrom D L. 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