1 Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 Aviation Military Representative Office of Army Equipment Department in Beijing, Beijing 100041, China 3 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
The morphological evolution of γ′ phase, the precipitation of TCP phases and the evolution of the interfacial dislocation networks in DD22 nickel-based single crystal superalloys with different Ru contents (3% and 5%, mass fraction) were investigated by transmission electron microscopy and field emission scanning electron microscopy during long-term aging at 1130 ℃. The results show that γ′ phase of 5Ru alloy are smaller in size and more regular in shape than that of 3Ru alloy. The mismatch of γ/γ′ phases is larger in 5Ru alloy, and the high content of Ru causes the reverse distribution of elements such as Re and Mo. During long-term aging at 1130 ℃, the coarsening rate, dissolution rate and rafting rate of γ′ phase in 5Ru alloy are lower than those of 3Ru alloy. There is still no TCP phase precipitation in 5Ru alloy after long-term aging for 1000 h, while a small amount of TCP phase is precipitated in 3Ru alloy after long-term aging for 50 h. With the prolongation of long-term aging time, the number and size of TCP phases both increase. Compared with 3Ru alloy, the interfacial dislocation networks of 5Ru alloy are denser and more regular after long-term aging for 1000 h. Above all, the reverse distribution of elements and low diffusion coefficient of Ru make 5Ru alloy exhibit higher microstructural stability than 3Ru alloy.
ZHANG W G , LIU L , ZHAO X B , et al. Progress in directionally solidified superalloys[J]. Foundry, 2009, 58 (1): 1- 6.
2
CHEN J Y , FENG Q , SUN Z Q . Topologically close-packed phase promotion in a Ru-containing single crystal superalloy[J]. Scripta Materialia, 2010, 63 (8): 795- 798.
doi: 10.1016/j.scriptamat.2010.06.019
ZHANG Y B , LIU L , HUANG T W , et al. Incipient melting and solution heat treatment of a boron-bearing third generation single crystal nickel base superalloy[J]. Rare Metal Materials and Engineering, 2017, 46 (10): 3105- 3110.
4
EPISHIN A , BRUCKNER U , PORTELL P D , et al. Influence of small rhenium additions on the lattice spacing of nickel solid solution[J]. Scripta Materialia, 2003, (48): 455- 459.
5
DUBIEL B , INDYKA P , KALEMBA-REC I , et al. The influence of high temperature annealing and creep on the microstructure and chemical element distribution in the γ, γ' and TCP phases in single crystal Ni-base superalloy[J]. Journal of Alloys and Compounds, 2018, (731): 693- 703.
6
ZHAO G Q , TIAN S G , SHU D L , et al. Influence of Ru on creep behavior and concentration distribution of Re-containing Ni-based single crystal superalloy at high temperature[J]. Materials Research Express, 2020, 7 (6): 066507.
doi: 10.1088/2053-1591/ab9666
7
O'HARA K S, WALSTON W S, ROSS E W, et al. Nickel base superalloy and article: US 5482789[P]. 1996-01-09.
8
REED R C , YEH A C , TIN S , et al. Identification of the partitioning characteristics of ruthenium in single crystal superalloys using atom probe tomography[J]. Scripta Materialia, 2004, 51 (4): 327- 331.
doi: 10.1016/j.scriptamat.2004.04.019
CHEN J Y , HU P P , FENG Q , et al. Effects of Ru on microstructural evolution during thermal exposure and stress-rupture property of Ni-based single crystal superalloys[J]. Rare Metal Materials and Engineering, 2011, 40 (12): 2111- 2116.
10
ZHANG J X , MURAKUMO T , HARADA H , et al. Dependence of creep strength on the interfacial dislocations in a fourth generation SC superalloy TMS-138[J]. Scripta Materialia, 2003, 48, 287- 293.
doi: 10.1016/S1359-6462(02)00379-2
11
PYCZAK F, DEVRIENT B, MUGHRABI H. The effects of different alloying elements on the thermal expansion coefficients, lattice constants and misfit of nickel-based superalloys investigated by X-ray diffraction[C] // Superalloys 2004. Warrendale, USA: TMS, 2004: 827-836.
12
KABLOV E N, PERTRUSHIN N V. Designing of high-rhenium single crystal Ni-base superalloy for gas turbine blades[C] // Superalloys 2008. Warrendale, USA: TMS, 2008: 901-910.
XIA P C , YU W F , YU J J , et al. Influence of long-term thermal exposure on γ' phase of DZ951 alloy[J]. Journal of Materials Engineering, 2007, (12): 8- 11.
doi: 10.3969/j.issn.1001-4381.2007.12.002
14
BALDAN A . Review progress in Ostwald ripening theories and their applications to the γ'-precipitates in nickel-base superalloys part Ⅱ nickel-base superalloys[J]. Journal of Materials Science, 2002, 37 (12): 2379- 2405.
doi: 10.1023/A:1015408116016
15
SHI Q Y , HUO J J , ZHENG Y R , et al. Influence of Mo and Ru additions on the creep behavior of Ni-based single crystal superalloys at 1100 ℃[J]. Materials Science and Engineering: A, 2018, 725, 148- 159.
doi: 10.1016/j.msea.2018.04.026
LIU G , LIU L , ZHANG S X , et al. Effects of Re and Ru on microstructure and segregation of Ni-based single-crystal superalloys[J]. Acta Metallurgica Sinica, 2012, 48 (7): 845- 852.
HUANG T W , LU J , XU X , et al. Effects of rhenium and tantalum on microstructural stability of hot-corrosion resistant single crystal superalloys aged at 900 ℃[J]. Acta Metallurgica Sinica, 2019, 55 (11): 1427- 1436.
doi: 10.11900/0412.1961.2019.00091
18
WANG T , CHEN L Q , LIU Z K . First-principles calculations and phenomenological modeling of lattice misfit in Ni-base superalloys[J]. Materials Science and Engineering: A, 2006, 431 (1/2): 196- 200.
19
HE C , HUANG T , YANG W , et al. Different roles of stacking fault energy and diffusivity in the creep performance of nickel-based single-crystal superalloys[J]. Materials Research Express, 2021, (8): 036510.
HUO J J. Effect of Co, Cr, Mo, Ru additions on TCP phase evolution and creep behavior at 950 ℃ in 4th generation Ni-base single crystal superalloys[D]. Beijing: University of Science and Technology Beijing, 2018.
21
MASOUMI F , JAHAZI M , SHAHRIARI D , et al. Coarsening and dissolution of γ' precipitates during solution treatment of AD730 Ni-based superalloy: mechanisms and kinetics models[J]. Journal of Alloys and Compounds, 2016, (658): 981- 995.
22
GIRAUD R , HERVIER Z , CORMIER J , et al. Strain effect on the γ' dissolution at high temperatures of a nickel-based single crystal superalloy[J]. Metallurgical and Materials Transactions A, 2012, (44): 131- 146.
SHI Q Y. Effects of multiple alloying elements on microstructure and high-temperature low-stress creep behavior in fourth generation Ni-based single crystal superalloys[D]. Beijing: University of Science and Technology Beijing, 2015.
24
TAN X , LIU J , JIN T , et al. Effect of ruthenium on precipitation behavior of the topologically close-packed phase in a single-crystal Ni-based superalloy during high-temperature exposure[J]. Metallurgical and Materials Transactions A, 2012, 43 (10): 3608- 3614.
doi: 10.1007/s11661-012-1163-z
25
SATO A , HARADA H , YOKOKAWA T , et al. The effects of ruthenium on the phase stability of fourth generation Ni-base single crystal superalloys[J]. Scripta Materialia, 2006, 54 (9): 1679- 1684.
doi: 10.1016/j.scriptamat.2006.01.003
26
GAO Q , LIU L R , TANG X H , et al. Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5[J]. China Foundry, 2019, 16 (1): 14- 22.
doi: 10.1007/s41230-019-8113-y
CAO K L , YANG W C , QU P F , et al. Research progress in effect of Ru on solidification characteristics, precipitation of topologically close-packed phases and creep property of nickel-based single crystal superalloy[J]. Journal of Materials Engineering, 2022, 50 (1): 80- 92.