Evolution Law of γ' Precipitates in New Directionally Solidified Nickel-Base Superalloy DZ445 at High Temperatures

NIU Qian; ZHANG Peng; LI Jiao; GONG Xiufang; SONG Xiaolong

doi:DOI: 10.11973/jxgccl202303003

Materials and Mechanical Engineering > 2023 > 47(3): 12-18. > DOI: DOI: 10.11973/jxgccl202303003

NIU Qian, ZHANG Peng, LI Jiao, GONG Xiufang, SONG Xiaolong. Evolution Law of γ' Precipitates in New Directionally Solidified Nickel-Base Superalloy DZ445 at High Temperatures[J]. Materials and Mechanical Engineering, 2023, 47(3): 12-18. DOI: DOI: 10.11973/jxgccl202303003

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Evolution Law of γ' Precipitates in New Directionally Solidified Nickel-Base Superalloy DZ445 at High Temperatures

1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China;
2. R&D Center, Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, China;
3. Instrumental Analysis Center, Xi'an Jiaotong University, Xi'an 710049, China;
4. State Key Laboratory for Long-Life High Temperature Materials, Dongfang Turbine Co., Ltd., Deyang 618000, China

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Received Date: January 16, 2022
Revised Date: December 12, 2022

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Abstract

Evolution law of γ' strengthening precipitates at high temperatures in a new directionally solidified nickel-base superalloy DZ445 was studied by thermal exposure tests at 800-900 ℃. The results show that at high temperatures, the growth of γ'precipitates was controlled by diffusion of matrix elements, and the growth kinetics followed the Lifshitz-Slyozov-Wagner ripening law; the diffusion activation energy was 305 kJ·mol^-1. The microstructure of the alloy was stable. Even after thermal exposure at 900 ℃ for 10 000 h, the average particle size of γ' precipitates only increased to (928±14) nm. The volume fractions of γ' precipitates remained about 50% in thermal exposure at 800-900 ℃ for 10 000 h, and no topologically close-packed phase was observed. During thermal exposure at 850 ℃ and 900 ℃, the shape of γ' precipitates changed from spheroidal to cubic or tetragonal, which was related to the particle size and lattice mismatch.
- gas turbine,
- directional solidification,
- nickel-base superalloy,
- microstructural stability,
- coarsening kinetics

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[1]	REED R C.The Superalloys[M].Cambridge:Cambridge University Press,2006.
[2]	PANWISAWAS C,TANG Y T,REED R C.Metal 3D printing as a disruptive technology for superalloys[J].Nature Communications,2020,11:2327.
[3]	POLLOCK T M,CLARKE A J,BABU S S.Design and tailoring of alloys for additive manufacturing[J].Metallurgical and Materials Transactions A,2020,51(12):6000-6019.
[4]	YOKOKAWA T,HARADA H,KAWAGISHI K,et al.Advanced alloy design program and improvement of sixth-generation Ni-base single crystal superalloy TMS-238[C]//Superalloys 2020:Proceedings of the 14th International Symposium on Superalloys.[S.l.]:Springer Cham,2020:122-130.
[5]	ZHANG P.Tensile deformation mechanisms in a new directionally solidified Ni-base superalloy containing coarse γ' precipitates at 650℃[J].Materials Science and Engineering:A,2017,702:343-349.
[6]	POLLOCK T M.Creep resistance of CMSX-3 nickel base superalloy single crystals[J].Acta Metallurgica et Materialia,1992,40(1):1-30.
[7]	ZHANG P, YUAN Y, ZHONG L, et al. Microstructural stability and tensile properties of a new γ'-hardened Ni-Fe-base superalloy[J].Materialia,2021,16:101061.
[8]	NEMBACH E, NEITE G.Precipitation hardening of superalloys by ordered γ'-particles[J].Progress in Materials Science,1985,29(3):177-319.
[9]	VAN SLUYTMAN J S, POLLOCK T M. Optimal precipitate shapes in nickel-base γ-γ' alloys[J]. Acta Materialia, 2012, 60(4):1771-1783.
[10]	MURAKUMO T,KOBAYASHI T, KOIZUMI Y,et al.Creep behaviour of Ni-base single-crystal superalloys with various γ' volume fraction[J].Acta Materialia,2004,52(12):3737-3744.
[11]	HVTHER W,REPPICH B.Interaction of dislocations with coherent,stress-free,ordered particles[J].International Journal of Materials Research,1978,69(10):628-634.
[12]	GLATZEL U.Calculations of internal stresses in the γ/γ' microstructure of a nickel-base superalloy with high volume fraction of γ'-phase[J].Scripta Metallurgica,1989,23(11):1839-1844.
[13]	YU J J.Effect of heat treatment on microstructure and stress rupture life of DD32 single crystal Ni-base superalloy[J].Materials Science and Engineering:A,2007,460/461:420-427.
[14]	FÄHRMANN M.Influence of coherency stress on microstructural evolution in model Ni-Al-Mo alloys[J].Acta Metallurgica et Materialia,1995,43(3):1007-1022.
[15]	MAHESHWARI A,ARDELL A J.Morphological evolution of coherent misfitting precipitates in anisotropic elastic media[J].Physical Review Letters,1993,70(15):2305-2308.
[16]	KOTVAL P S.The microstructure of superalloys[J].Metallography,1969,1(3/4):251-285.
[17]	ARDELL A J.On the modulated structure of aged Ni-Al alloys:With an appendix on the elastic interaction between inclusions by J.D.Eshelby[J].Acta Metallurgica,1966,14(10):1295-1309.
[18]	ARDELL A J.The effects of elastic interactions on precipitate microstructural evolution in elastically inhomogeneous nickel-base alloys[J].Philosophical Magazine,2014,94(19):2101-2130.
[19]	ZHANG P, YUAN Y, YAN J B, et al. Morphological evolution of γ' precipitates in superalloy M4706 during thermal aging[J].Materials Letters,2018,211:107-109.
[20]	LIFSHITZ I M,SLYOZOV V V,et al.The kinetics of precipitation from supersaturated solid solutions[J].Journal of Physics and Chemistry of Solids,1961,19(1/2):35-50.
[21]	WAGNER C.Theorie der alterung von niederschlägen durch umlösen (Ostwald-reifung)[J].Zeitschrift Für Elektrochemie,Berichte Der Bunsengesellschaft Für Physikalische Chemie,1961,65(7/8):581-591.
[22]	ARDELL A J,OZOLINS V.Trans-interface diffusion-controlled coarsening[J].Nature Materials,2005,4(4):309-316.
[23]	TILEY J,VISWANATHAN G B,SRINIVASAN R,et al.Coarsening kinetics of γ' precipitates in the commercial nickel base superalloy René 88 DT[J].Acta Materialia,2009,57(8):2538-2549.
[24]	LIN T L.The deformation mechanism of a γ' precipitation-hardened nickel-base superalloy[J].Materials Science and Engineering:A,1990,128(1):23-31.
[25]	MOLEN E H,OBLAK J M,KRIEGE O H.Control of γ' particle size and volume fraction in the high temperature superalloy Udimet 700[J].Metallurgical Transactions,1971,2(6):1627-1633.
[26]	QIN X Z,GUO J T,YUAN C,et al.Effects of long-term thermal exposure on the microstructure and properties of a cast Ni-base superalloy[J].Metallurgical and Materials Transactions A,2007,38(12):3014-3022.
[27]	STEVENS R A, FLEWITT P E J. The effects of γ' precipitate coarsening during isothermal aging and creep of the nickel-base superalloy IN-738[J].Materials Science and Engineering,1979,37(3):237-247.

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Evolution Law of γ' Precipitates in New Directionally Solidified Nickel-Base Superalloy DZ445 at High Temperatures

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