利用透射电镜能谱法(TEM-EDX)研究了GH742合金中γ′和γ基体两相成分随温度和时效时间的变化规律.结果表明:合金在1050℃时效时,γ′相和γ基体的成分在时效初期变化较大,当时效时间超过1440min后,γ′相和γ基体的成份基本稳定.合金在750～1100℃时效时,γ′相和γ基体的成分均随着温度的升高而发生变化,其中γ基体的成分随温度变化较明显.合金中各元素在γ′和γ两相中的偏析率Cγ′/ Cγ变化规律研究表明:Ti,Al,Nb,Ni等γ′形成元素的偏析率均随着时效温度的升高而降低,而Cr,Co,Mo等γ形成元素的偏析率均随着时效温度的升高而增大.
The phase composition of γ′ phase and γ matrix in GH742 was investigated by energy dispersive of X-ray spectroscopy (EDX) in an analysis transmission electron microscope (TEM-EDX). The dependence of composition of γ′ and γ phase on aging time indicates that the composition of γ′ and γ phase evolves drastically in short aging time at the temperature of 1050℃ and reaches the equilibrium condition when aging for 1440 min. The dependence of composition of γ′ and γ phase on temperature indicates that the composition of γ′ and γ phases evolves with the increasing temperature in the range of 750℃ to 1100℃. The dependence of partitioning ratios Cγ′/ Cγon temperature shows that the partitioning ratios Cγ′/Cγ of γ′-forming elements Ti, Al, Nb, Ni have a decrease and those of γ-forming elements Cr, Co, Mo have an increase with the temperature increasing.
参考文献
| [1] | SIMS C T;STOLOFF N S;HAGEL W C.Superalloy II[M].John Wiley and Sons,Inc,1987:97-131. |
| [2] | WATANABA R;KUNO T .Alloy design of nickel-base precipitation hardened superalloys[J].J Iron Steel Inst Jan,1976,16:437-446. |
| [3] | MISIMA Y;OCHIAI S;SUZUKI T .Lattice parameters of Ni,Ni3Al and Ni3Ge solid solutions with additions of transition and B-subgroup elements[J].ACTA METALLURGICA,1985,33:1161-1169. |
| [4] | MICHELL R J;PREUSS M;HARDY M C et al.Influence of composition and cooling rate on constrained and unconstrained lattice parameters in advanced polycrystalline nickel-base superalloy[J].Materials Science and Engineering,2006,A423:282-291. |
| [5] | SHIMANUKI Y;MASUI M;DOI H .The variation with aging condition of the composition of phase in a Ni-base superalloy UDIMET520[J].Scripta Metallurgica,1976,10:805-808. |
| [6] | Hemmersmeier U.;Feller-Kniepmeier M. .Element distribution in the macro- and microstructure of nickel base superalloy CMSX-4[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):87-97. |
| [7] | CHAMBRELAND S;BLAVETE D;BOUET M .Atom-probe investigation of the early stages of decomposition in a nickel-base superalloy[J].Journal of De Physique,1987,48:361-367. |
| [8] | DUVAL S;CHAMBRELAND S;CARON P et al.Phase composition and chemical order in the single crystal nickel base superalloy MC2[J].Acta Metallurgica,1994,42:185-194. |
| [9] | VAN DER MOLEN E H;OBLAK J M;KREDGE O H .Control of γ′ particle size and volume fraction in the high temperature superalloy Udimet700[J].Metallurgical and Materials Transactions,1971,2:1627-1633. |
| [10] | 《中国航空材料手册》编辑委员会.中国航空材料手册[M].北京:中国标准出版社,2004:482. |
| [11] | REINHARDT SCHUHMANN JR.Metallurgical Engineering,Vol.1 Engineering Principles[M].Addison-Wesley Press,1952:276. |
| [12] | SHIN J S;BAE J S;KIM H J et al.Ordering-disordering phenomena and micro-hardness characteristics of B2 phase in Fe-(5%-6.5%) Si alloys[J].Materials Science and Engineering,2005,A407:282-290. |
| [13] | KUSABIRAKI K;ZHANG X M;OOKA T .The growth of γ′ precipitates in a 53Ni-20Co-15Cr superalloy[J].Iron Steel Inst Jan Int,1995,35:1115-1120. |
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