Results 21 to 30 of about 9,930 (219)

Femtosecond laser micromachining of a single-crystal superalloy

Scripta Materialia, 2004
Investigations on femtosecond laser micromachining of single crystal superalloys with and without plasma-sprayed thermal barrier coatings were conducted under laser fluences ranging from 0.1 J/cm 2 up to 160 J/cm 2 . Micromachining was carried out in air using a titanium:sapphire laser system (O = 780 nm) operating at a repetition rate of 1 kHz and ...
Q. Feng, Y.N. Picard, H. Liu, S.M. Yalisove, G. Mourou, T.M. Pollock   +5 more
openaire   +1 more source

Optimizing Scale Adhesion on Single Crystal Superalloys [PDF]

Materials Science Forum, 2001
To improve scale adhesion, single crystal superalloys have been desulfurized to levels below 1 ppmw by hydrogen annealing. A transition to fully adherent behavior has been shown to occur at a sulfur level of about 0.2 ppmw, as demonstrated for PWA 1480, PWA 1484, and Rene N5 single crystal superalloys in 1100-1150 C cyclic oxidation tests up to 2000 h.
James L. Smialek, Bruce A. Pint
openaire   +1 more source

Analysis of crystallographic orientation influence on thermal fatigue with delay of the single-crystal corset sample by means of thermo-elasto-visco-plastic finite-element modeling

MATEC Web of Conferences, 2018
The influence of a delay time at the maximum temperature on the number of cycles before the macrocrack initiation for two thermal loading programs was investigated for single-crystal nickel-based superalloy VZhM4.
Savikovskii Artem, Semenov Artem, Getsov Leonid   +2 more
doaj   +1 more source

Advances in intelligent design of single crystal superalloys and protective coatings

Journal of Aeronautical Materials
As the turbine inlet temperatures of aero engines continue to rise， there is an urgent need to develop a new generation of single-crystal superalloys and their thermal protective coatings for turbine blades.
XING Yifeng, YIN Aobo, GENG Lilun, YANG Fan, RU Yi, ZHAO Wenyue, PEI Yanling, LI Shusuo, GONG Shengkai   +8 more
doaj   +1 more source

Morphology Dependent Flow Stress in Nickel-Based Superalloys in the Multi-Scale Crystal Plasticity Framework

Crystals, 2017
This paper develops a framework to obtain the flow stress of nickel-based superalloys as a function of γ-γ’ morphology. The yield strength is a major factor in the design of these alloys.
Shahriyar Keshavarz, Zara Molaeinia, Andrew Reid, Stephen Langer   +3 more
doaj   +1 more source

Research progress in application of nickel-based single crystal superalloy/thermal barrier coating system

Cailiao gongcheng
In the pursuit of achieving a superior thrust-to-weight ratio and service reliability for advanced aero engines， increasingly stringent requirements are continually imposed on the material and process selection for turbine blades.
LIU Yanfei, ZHONG Yan, TAO Xipeng, TIAN Wei, GUO Huiming, LIANG Wei   +5 more
doaj   +1 more source

Microstructure evolution and tensile property of a first-generation single crystal superalloy fabricated by laser melting deposition

Materials Research Express, 2020
Additive manufacturing (AM) of single crystal superalloys has got some progress in recent researches, but there are few reports on eliminating recrystallization or mechanical properties of single crystal superalloys by AM.
Guowei Wang, Xianfeng Shen, Jialin Yang, Jingjing Liang, Yizhou Zhou, Xiaofeng Sun   +5 more
doaj   +1 more source

Phenomenological and Physically Based Modeling of Flow Stress and Strengthening Mechanism of Inconel 718

Advanced Engineering Materials, EarlyView.
Nickel‐based alloys are widely used in high‐temperature applications due to their excellent mechanical strength and oxidation resistance. However, properties such as high‐temperature strength and pronounced work‐hardening make them difficult to machine.
Soheil Rooein, Oliver Schenk, Christoph Broeckmann   +2 more
wiley   +1 more source

Combined Process‐ and Phase‐Field‐Simulation to Predict the Microstructure of Single‐Crystal Ni‐Based Superalloys

Advanced Engineering Materials, EarlyView.
A combined finite element and phase‐field approach predicts the evolution of microstructure during the directional solidification of Ni‐based superalloys. The model reveals how withdrawal rate, temperature gradient, and wall thickness control the dendrite spacing, highlighting the strong effect of surface regions in thin sections where dendrite growth ...
Sean Böhm, André B. Baldissera, Rainer Völkl, Uwe Glatzel   +3 more
wiley   +1 more source

The Ni₃Al/Ni Interfacial Contribution to the Indentation Size Effect of Ni-Based Single-Crystal Superalloys

Solids
Hardness decreases as indentation depth increases at both the nano- and micro-meter scales. By incorporating interfacial contributions, the indentation size effect can provide valuable information on the deformation behaviors of Ni-based single-crystal ...
Zhiwei Zhang, Xingyi Zhang, Rong Yang, Jun Wang, Chunsheng Lu   +4 more
doaj   +1 more source