Inhibition of Cusp magnetic field on stray-crystal formation in platform region during directionally solidified single-crystal superalloy

2021 ◽  
Author(s):  
Weili Ren ◽  
Tao Zhou ◽  
Xiaotan Yuan ◽  
Ming Jian ◽  
Congjiang Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Single Crystal Superalloy ◽  
Crystal Formation ◽  
Directionally Solidified ◽  
Cusp Magnetic Field

Effect of Hf Content on Oxidation Resistance of Single Crystal Superalloy at 1000°C

2014 ◽  
Vol 915-916 ◽  
pp. 562-566 ◽  
Author(s):  
Z.X. Shi ◽  
Shi Zhong Liu ◽  
M. Han ◽  
J.R. Li
Keyword(s):  
Grain Size ◽  
Single Crystal ◽  
Oxide Scale ◽  
Oxide Layer ◽  
Oxidation Resistance ◽  
Isothermal Oxidation ◽  
Single Crystal Superalloy ◽  
Ambient Atmosphere ◽  
Directionally Solidified ◽  
Better Than

The specimens of single crystal superalloy DD6 with 0.10% Hf and 0.47% Hf were prepared in the directionally solidified furnace. The effect of Hf content on the isothermal oxidation resistance of the second generation single crystal superalloy DD6 was studied at 1000°Cin ambient atmosphere. Morphology of oxides was examined by SEM, and their composition was analyzed by XRD and EDS. The experimental results show that the oxidation resistance of DD6 alloy with 0.47% Hf is better than that of the alloy with 0.10% Hf. The alloy with different Hf content all obeys parabolic rate law during oxidation for 100h at 1000°C. The increase of Hf content can promote the Al2O3 formation and decreases the proportion of NiO. The oxide grain size and the thickness of the oxide layer all reduce with increasing of Hf content. The oxide scale of the alloy with different Hf content is made up of an outer NiO layer with a small amount of Co3O4, inner Al2O3 and Cr2O3 layer with a small amount of TaO2.

Effect of a High Magnetic Field on Microstructures of Ni-Based Single Crystal Superalloy During Seed Melt-Back

2016 ◽  
Vol 47 (2) ◽  
pp. 828-833 ◽  
Author(s):  
Weidong Xuan ◽  
Huan Liu ◽  
Chuanjun Li ◽  
Zhongming Ren ◽  
Yunbo Zhong ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
High Magnetic Field ◽  
Single Crystal Superalloy

TMF of Directionally Solidified and Single Crystal Superalloy

2011 ◽  
Vol 233-235 ◽  
pp. 2227-2230
Author(s):  
Qing Wu Wang ◽  
Shi Hui Zhang ◽  
Mao Pang
Keyword(s):  
Single Crystal ◽  
Fatigue Damage ◽  
Evaluation Method ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Damage Model ◽  
Equivalent Strain ◽  
Single Crystal Superalloy ◽  
Thermomechanical Coupling ◽  
Directionally Solidified

Directional solidification and single crystal technology reduces material defects, improves material mechanical property and improves resistances to the high temperature fatigue, creep and corrosion. Accumulation of fatigue damage is a method of life prediction analysis and many fatigue damage models are proposed. Based on foregone research achievements, this paper presents a fatigue damage model, which could reflect material anisotropy and thermomechanical coupling effect. Based on equivalent strain, a fatigue damage evaluation method of directionally solidified and single crystal superalloy is presented and by this method, the linear fit of published fatigue experiment data is proceeded. Directionally solidified and single crystal superalloy is of strong anisotropy and crystal orientation has strong effect on component mechanical response. Comparative life of different location on component could be analyzed.

scholarly journals Effect of Y on the Oxidation Behavior of a Directionally Solidified Ni-based Single Crystal Superalloy

2020 ◽  
Author(s):  
Zihan Zhao ◽  
Kai Guan ◽  
Renjie Cui ◽  
Jianchao Qin ◽  
Zhaohui Huang
Keyword(s):  
Weight Gain ◽  
Single Crystal ◽  
Oxide Scale ◽  
Oxidation Rate ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Oxidation Products ◽  
Single Crystal Superalloy ◽  
Directionally Solidified ◽  
Oxidation Weight Gain

Abstract The effect of Y addition on the oxidation behavior of a Ni-based directionally solidified single crystal superalloy was investigated. Isothermal oxidation test for the samples with different-level Y addition was conducted at 1100℃ in air. The Y content of the samples was demarcated by the actual pickup amount resulted from ICP-AES test. It was found that the addition of Y increased the oxide resistance by an adhesive double-layer oxide scale which was composed of Al2O3 and spinel Ni(Cr,Al)2O4. With 70ppm Y addition, the oxidation weight gain was decreased from 12.6g/m2 for the alloy without Y addition to 5.3g/m2, and the oxidation rate was significantly decreased. Besides, the internal nitride also disappeared after Y doping because of the increasing oxidation scale adherence and the decreasing of oxidation products. In this study, 660ppm Y addition alloy showed the best oxidation resistance.

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