An effective and low-cost method to prepare Re-doped aluminide coating on a Ni-based single crystal superalloy

2021 ◽  
Vol 285 ◽  
pp. 129112
Author(s):  
W. Li ◽  
L.B. Fu ◽  
S.M. Li ◽  
X. Peng ◽  
S.M. Jiang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Aluminide Coating ◽  
Low Cost ◽  
Single Crystal Superalloy

Tensile Properties of a Low-Cost First Generation Single Crystal Superalloy DD16

2013 ◽  
Vol 747-748 ◽  
pp. 478-482 ◽  
Author(s):  
Jian Wei Xu ◽  
Yun Song Zhao ◽  
Ding Zhong Tang
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Single Crystal ◽  
Tensile Properties ◽  
Cleavage Fracture ◽  
Room Temperature ◽  
First Generation ◽  
Low Cost ◽  
Single Crystal Superalloy ◽  
Fracture Characteristics

The tensile properties of a low-cost first generation single crystal superalloy DD16 have been investigated. The results show that values of the tensile strength and yield strength of DD16 alloy were similar at typical temperatures; from room temperature to 760, the yield strength of DD16 alloy increases; However, above 760, the yield strength of DD16 alloy decreases remarkably, and the maximum of the yield strength was 1145.5MPa at 760. From room temperature to 760, the fracture mode was cleavage fracture; But above 760, the fracture characteristics changed from cleavage to dimple.

Effects of Surface Recrystallization on the Microstructures and Creep Properties of Single Crystal Superalloy DD6

2010 ◽  
Vol 638-642 ◽  
pp. 2279-2284
Author(s):  
Jia Rong Li ◽  
Feng Li Sun ◽  
Ji Chun Xiong ◽  
Shi Zhong Liu ◽  
Mei Han
Keyword(s):  
Single Crystal ◽  
Annealing Temperature ◽  
Low Cost ◽  
Rupture Life ◽  
Creep Rupture ◽  
Single Crystal Superalloy ◽  
Recrystallization Temperature ◽  
Creep Properties ◽  
Grit Blasting ◽  
Rupture Properties

This work assesses the effects of the surface recrystallization of the processing of water grit blasting, grit blasting and mechanically polishing on the microstructures and creep rupture properties of DD6 alloy, a low-cost second generation single crystal superalloy. The results demonstrate that the possibility and the depth of the surface recrystallization of DD6 show an increase as the annealing temperature increases from 1050°C to 1250°C. No surface recrystallization happens when the specimens of the alloy have been undergone at 1100°C for 4 hours after water grit blasting, but the surface recrystallization occurs at the annealing temperature above 1200°C for 4 hours after water grit blasting. The test indicates that the increasing pre-deformation decreases the surface recrystallization temperature. The creep rupture life of DD6 alloy without processing is 274.4 hours, 341.1 hours at the conditions of 980°C/250MPa, 1070°C/140MPa respectively. After annealing at 1100°C for 4 hours, the creep rupture life of the alloy with the processing of water grit blasting is equivalent to that of the alloy without processing. The surface recrystallization of the alloy happens with the processing of grit blasting after the annealing at 1100°C for 4 hours, and there is a reduction of the creep rupture life at the conditions as mentioned above. The creep properties of DD6 alloy meet the needs of blades and vanes of single crystal for advanced aeroengines when the surface recrystallization of the alloy occurs during manufacturing and processing.

Development of a Low-Cost Third Generation Single Crystal Superalloy DD9

2016 ◽  
pp. 55-63 ◽  
Author(s):  
J.R. Li ◽  
S.Z. Liu ◽  
X.G. Wang ◽  
Z.X. Shi ◽  
J.Q. Zhao
Keyword(s):  
Single Crystal ◽  
Low Cost ◽  
Single Crystal Superalloy ◽  
Third Generation

Hot corrosion behavior of Pt-Ir modified aluminide coatings on the nickel-base single crystal superalloy TMS-82+

2007 ◽  
Vol 22 (1) ◽  
pp. 206-216 ◽  
Author(s):  
Y.N. Wu ◽  
A. Yamaguchi ◽  
H. Murakami ◽  
S. Kuroda
Keyword(s):  
Single Crystal ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Aluminide Coating ◽  
Mass Gain ◽  
Heating Time ◽  
Single Crystal Superalloy ◽  
Aluminide Coatings ◽  
Corrosion Kinetics ◽  
Nickel Base

Platinum-iridium films (Ir = 0, 32, 46, 83, 100 at.%) were deposited on the nickel-base single crystal superalloy through magnetron sputtering. After annealing and aluminizing, the Pt-Ir modified aluminide coatings mainly consisted of PtAl2 and β-(Ni,Pt,Ir)Al phases. Hot corrosion resistance of Pt-Ir modified aluminide coatings with the different Ir contents were evaluated by exposure at 1173 K in the presence of the 90%Na2SO4 + 10%NaCl (wt%) salt deposits. The corrosion kinetics curves of the specimens were plotted up to 100 h heating time. The phase constitution, morphology of corrosion products, and element concentrations along the cross section were also measured. The lowest mass gain (0.299 mg/cm2, after 100 h) was observed for Pt-46Ir aluminide coating because the dense and continuous protective Al2O3 scale formed. Phase transformation from β-(Ni,Pt)Al to γ′-(Ni,Pt)3Al, characteristics of the scale, and protection by Pt/Ir enriched layer had the important effects on the hot corrosion behavior of modified aluminide coatings.

Influences of MCrAlY Coatings and TBCs on Oxidation Behavior of a Ni-Based Single Crystal Superalloy

2015 ◽  
Vol 816 ◽  
pp. 289-296 ◽  
Author(s):  
Long Shi ◽  
Li Xin ◽  
Hua Wei ◽  
Sheng Long Zhu ◽  
Fu Hui Wang
Keyword(s):  
Single Crystal ◽  
Bond Coat ◽  
Physical Vapor Deposition ◽  
Low Cost ◽  
High Strength ◽  
Substrate Material ◽  
Single Crystal Superalloy ◽  
Thermal Growth ◽  
Nicraly Coating ◽  
Academy Of Sciences

DD98M alloy is a second generation nickel-based single crystal superalloy without Re addition, which is developed by Institute of Metal Research, Chinese Academy of Sciences. It is a combination of attractively strong points including high strength and low cost. In this work, Ni-based single crystal superalloy DD98M was adopted as the substrate material. Two types MCrAlY (M denote metal) coatings were deposited on DD98M specimen by arc ion plating and YSZ topcoat (TC) were deposited on the substrate by electron beam physical vapor deposition (EB-PVD) on the NiCrAlY bond coat (BC). Experimental results showed that the application of the NiCrAlY and NiCoCrAlYHfSi coatings improved the oxidation resistance of DD98M obviously at 1000 °C. The adhesion of oxide scale of NiCoCrAlYHfSi coating was much better than that of NiCrAlY coating. TBCs application greatly enhanced the operating temperature and significantly improved the durability of the substrate. The thermal growth oxidation (TGO) between the bond coat and topcoat play an important role in adhesion of the whole coating system.

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