Log in

Relevant bibliographies by topics / Nickelbased superalloy / Journal articles

To see the other types of publications on this topic, follow the link: Nickelbased superalloy.

Journal articles on the topic 'Nickelbased superalloy'

Author: Grafiati

Published: 3 June 2025

Last updated: 12 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 34 journal articles for your research on the topic 'Nickelbased superalloy.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

DONG, Gengyi, Yilit YIJIALA, Wenjun HAN, et al. "A Prediction Model of Evaporation Behavior of Nickel-Based Superalloy in Electron Beam Melting." Progress in Chinese Materials Sciences 3, no. 1 (2024): 1–11. http://dx.doi.org/10.48014/pcms.20231010001.

Full text

Abstract:

The electron beam melting technique has emerged as a novel refining technology extensively employed for alloy purification due to its advantages of effectively eliminating volatile impurities and non-metallic inclusions. However, a drawback associated with the melting process is the evaporation of alloy elements, which results in an uncontrollable alloy composition. In this paper, Wagner model is used to calculate and study the evaporation behavior. of nickel-based superalloy, and the database of infinite dilution activity coefficient and interaction coefficient of nickelbased superalloy has been established. The results show that the model can well predict the composition of electron beam melting superalloy, establish the relationship between electron beam melting power and temperature, and predict the composition of several groups of DZ125 alloys after melting with different power, which is in consistent with the experimental results. This model is of guiding significance for electron beam melting of nickel-based superalloy.

APA, Harvard, Vancouver, ISO, and other styles

2

Lindström, Thomas, Robert Eriksson, Daniel Ewest, Kjell Simonsson, Jan-Erik Lundgren, and Daniel Leidermark. "Crack initiation prediction of additive manufactured ductile nickelbased superalloys." MATEC Web of Conferences 165 (2018): 04013. http://dx.doi.org/10.1051/matecconf/201816504013.

Full text

Abstract:

A model to predict crack initiation life of an additive manufactured nickel-based superalloy similar to Hastelloy X subjected to low-cycle fatigue loading at room temperature has been developed, taking material anisotropy into account. An anisotropic constitutive model based on the Hill yield criterion was developed, with linear kinematic hardening up to a saturation value of the back stress, above which the material behaves perfectly plastic. Low-cycle fatigue experiments has been performed on additive manufactured smooth bars with two different build orientations, with an angle of 0⁰ and 90⁰ relative to the building platform. A total of 20 experiments at room temperature were conducted with different strain ranges and R-values. To predict the crack initiation life of the specimens, a model based on the Smith-Watson-Topper (SWT) parameter has been established, where ten of the specimens were used to calibrate the initiation model, and the remaining specimens were used for validation. Using this model, the obtained crack initiation life agrees well with the experiments.

APA, Harvard, Vancouver, ISO, and other styles

3

Wang, Kailun, Jinpeng Zhu, Hailong Wang, et al. "Air plasma-sprayed high-entropy (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 coating with high thermal protection performance." Journal of Advanced Ceramics 11, no. 10 (2022): 1571–82. http://dx.doi.org/10.1007/s40145-022-0630-2.

Full text

Abstract:

AbstractHigh-entropy rare-earth aluminate (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12 (HE-RE3Al5O12) has been considered as a promising thermal protection coating (TPC) material based on its low thermal conductivity and close thermal expansion coefficient to that of Al2O3. However, such a coating has not been experimentally prepared, and its thermal protection performance has not been evaluated. To prove the feasibility of utilizing HE-RE3Al5O12 as a TPC, HE-RE3Al5O12 coating was deposited on a nickelbased superalloy for the first time using the atmospheric plasma spraying technique. The stability, surface, and cross-sectional morphologies, as well as the fracture surface of the HE-RE3Al5O12 coating were investigated, and the thermal shock resistance was evaluated using the oxyacetylene flame test. The results show that the HE-RE3Al5O12 coating can remain intact after 50 cycles at 1200 °C for 200 s, while the edge peeling phenomenon occurs after 10 cycles at 1400 °C for 200 s. This study clearly demonstrates that HE-RE3Al5O12 coating is effective for protecting the nickel-based superalloy, and the atmospheric plasma spraying is a suitable method for preparing this kind of coatings.

APA, Harvard, Vancouver, ISO, and other styles

4

Razak, N. H., M. M. Rahman, and K. Kadirgama. "Cutting force and chip formation in end milling operation when machining nickelbased superalloy, Hastelloy C-2000." JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES 14, no. 1 (2017): 2539–51. http://dx.doi.org/10.15282/jmes.11.1.2017.12.0233.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Koltygin, A. V., V. E. Bazhenov, A. I. Bazlov, T. A. Bazlova, and V. D. Belov. "Effect of scrap using in charge on the microstructure and properties of ZhS6U nickel-based superalloy. Part 2. Structure analysis and mechanical properties of ZhS6U prepared with scrap." Izvestiya. Ferrous Metallurgy 62, no. 7 (2019): 525–30. http://dx.doi.org/10.17073/0368-0797-2019-7-525-530.

Full text

Abstract:

The second part of the article considers influence of the scrap amount on structure and mechanical properties of ZhS6U-VI nickelbased superalloy. As the use of scrap is associated with the possibility of alloy contamination by nonmetallic inclusions and loss of alloying elements, the influence of scrap on alloy structure and mechanical properties is in great importance. The samples with diameter of 12 mm were melted in a vacuum arc furnace and were casted into a copper mold from the virgin ZhS6U-VI alloy without scrap and from alloys with 50 % and 100 % of scrap. The alloys structures were investigated using optical microscopy on etched metallographic sections that were cut from the samples’ cross-sections. The studies were carried out on the as-cast samples and the samples after solution heat treatment for 4 hours at 1210 °C. The slightly higher nonmetallic inclusions content were observed in the structure of the alloy melted with scrap in comparison with virgin alloy melted without scrap. For the sample that was melted from 100 % of scrap the inclusions secure level is 3 (ASTM E 45-97) with an average size of inclusions of 28.4 ± 0.2 μm. Herewith the presence of single large inclusions with a size of not more than 70 microns was noted. However, it has no effect on the alloy mechanical properties. Mechanical properties after heat treatment (ultimate strength (UTS) = 1090 – 1100 МPа and elongation (El) = 9 – 11 %) were obtained on the samples melted using 50 and 100 % of scrap and fully correspond to the TU1-92-177-91 standard for ZhS6U-VI nickel-base superalloy. During solidification most of the large nonmetallic inclusions are concentrated under casting surface, which makes their machining difficult. Because of that the use of 100 % scrap without its preliminary processing is not recommended. Acceptable results were achieved when the 50 % of scrap was used.

APA, Harvard, Vancouver, ISO, and other styles

6

Shirzadi, A. A., and E. R. Wallach. "Novel Method for Diffusion Bonding Superalloys and Aluminium Alloys (USA Patent 6,669,534 B2, European Patent Pending)." Materials Science Forum 502 (December 2005): 431–36. http://dx.doi.org/10.4028/www.scientific.net/msf.502.431.

Full text

Abstract:

A novel method for diffusion bonding metallic alloys with stable surface oxide films (e.g. nickel and cobalt base superalloys and aluminium alloys) has been developed. The stable oxides on the faying surfaces of these alloys are replaced, prior to the bonding process, with a very thin metallic layer and/or less stable oxides, using a proprietary non-chemical oxide removal method based on the use of gallium. This new method is very rapid and neither requires the use of any sophisticated equipment nor is a costly process. Bonding is then readily achieved by either solid-state or transient-liquid-phase (TLP) diffusion bonding. Using this method, bonds in nickelbase and cobalt-base superalloys with “virtually invisible” bond interfaces and bonds in aluminium alloys with strengths as high as those of the parent alloys can be produced.

APA, Harvard, Vancouver, ISO, and other styles

7

Busse, Christian, Frans Palmert, Paul Wawrzynek, Björn Sjödin, David Gustafsson, and Daniel Leidermark. "Crystallographic crack propagation rate in single-crystal nickelbase superalloys." MATEC Web of Conferences 165 (2018): 13012. http://dx.doi.org/10.1051/matecconf/201816513012.

Full text

Abstract:

Single-crystal nickel-base superalloys are often used in the hot sections of gas turbines due to their good mechanical properties at high temperatures such as enhanced creep resistance. However, the anisotropic material properties of these materials bring many difficulties in terms of modelling and crack growth prediction. Cracks tend to switch cracking mode from Mode I cracking to crystallographic cracking. Crystallographic crack growth is often associated with a decrease in crack propagation life compared to Mode I cracking and this must be taken into account for reliable component lifing. In this paper a method to evaluate the crystallographic crack propagation rate related to a crystallographic crack driving force parameter is presented. The crystallographic crack growth rate is determined by an evaluation of heat tints on the fracture surface of a specimen subjected to fatigue loading. The complicated crack geometry including two crystallographic crack fronts is modelled in a three dimensional finite element context. The crack driving force parameter is determined by calculating anisotropic stress intensity factors along the two crystallographic crack fronts by finite-element simulations and post-processing the data in a fracture mechanics tool that resolves the stress intensity factors on the crystallographic slip planes in the slip directions. The evaluated crack propagation rate shows a good correlation for both considered crystallographic cracks fronts.

APA, Harvard, Vancouver, ISO, and other styles

8

Engberg,, Goran, and Luis Mendoza Camus,. "Tertiary Creep in the Cast Nickelbase Superalloy IN738LC. Effects of Pretreatments." High Temperature Materials and Processes 9, no. 1 (1990): 39–50. http://dx.doi.org/10.1515/htmp.1990.9.1.39.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Liu, Yong, and Shao Fu Huang. "Experimental Study on Electrochemical Drilling of Micro Holes with High Aspect Ratio." Advanced Materials Research 941-944 (June 2014): 1952–55. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.1952.

Full text

Abstract:

It is a difficult problem to fabricate deep and micro holes on the difficult-to-cut metals in the field of aviation manufacturing. The experimental research of electrochemical drilling technology with high-speed micro electrode for fabricating deep micro holes is carried out. The influences of rotary speed on machining precision and stability are studied. The holes, which the diameter is about 400μm, the aspect ratio is more than 10, and have steep wall and sharp edges were fabricated successfully on the nickelbase superalloys on self-developed high-precision micro-electrochemical machining system. It is proved that the high-speed electrochemical drilling process for fabricating deep and micro holes has a huge potential and broad application prospects.

APA, Harvard, Vancouver, ISO, and other styles

10

Bäker, Martin, and Joachim Rösler. "Effect of Co and Cr on the Stability of Strengthening Phases in Nickelbase Superalloys." Crystals 12, no. 8 (2022): 1084. http://dx.doi.org/10.3390/cryst12081084.

Full text

Abstract:

Nickel-base superalloys such as VDM 780 may possess a high content of Cr and Co. This influences solution energies of phase-forming elements such as Al and Ta (γ′-phase), Nb (γ′′- and δ-phase), and Ti (η-phase). We perform density functional theory studies of a nickel matrix at 0 K with high concentrations of either Co and Cr and calculate the influence of these elements on solution energies. In the case of Co, the solution energy can be predicted well by the nearest-neighbor interaction in the Co-rich matrix. For Cr, the effect is more complicated because Cr has a larger ionic radius and changes the magnetic state of the material. The effect of a Cr-rich matrix on the energy of Co is dominated by magnetic effects and interactions with the other elements by elastic deformation of the lattice. A high content of Co or Cr will thus increase the solvus temperature of the strengthening phase in nickel-base superalloys, in agreement with the literature and thermodynamic calculations.

APA, Harvard, Vancouver, ISO, and other styles

11

Gnäupel-Herold, T., and W. Reimers. "Stress states in the creep deformed single crystal nickelbase superalloy SC 16." Scripta Metallurgica et Materialia 33, no. 4 (1995): 615–21. http://dx.doi.org/10.1016/0956-716x(95)00266-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Kuttner, Thomas, та Monika Feller-Kniepmeier. "Shearing of γ′ particles in a single crystal nickelbase superalloy by stacking faults". Scripta Metallurgica et Materialia 30, № 9 (1994): 1121–26. http://dx.doi.org/10.1016/0956-716x(94)90325-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Heilmaier, Martin, Manja Krüger, and Holger Saage. "Recent Advances in the Development of Mechanically Alloyed Mo Silicide Alloys." Materials Science Forum 633-634 (November 2009): 549–58. http://dx.doi.org/10.4028/www.scientific.net/msf.633-634.549.

Full text

Abstract:

We review the current development status of Mo-Si-B alloys consisting of Mo solid solution and the intermetallic phases Mo3Si and Mo5SiB2 which could take advantage of the beneficial oxidation resistance of the silicide phases and of the outstanding mechanical properties of molybdenum. For adequate low temperature toughness a continuous Mo solid solution matrix should be established in the microstructure. Besides, wrought processing of such alloys at elevated temperatures requires the presence of an ultra-fine grained (UFG) microstructure. Both the prerequisites can be fulfilled using mechanical alloying (MA) as the crucial processing step which even yields nanostructured supersaturated powders after milling. However, values for the ductile-to-brittle transition temperature (DBTT) close to room temperature are unlikely due to grain boundary embrittlement by Si segregation. The possibility of reducing this segregation tendency by various micro-alloying additions will be demonstrated. Finally, the high temperature deformation behaviour of these UFG materials will be comparatively assessed against state-of-the-art Nickelbase single-crystalline superalloys.

APA, Harvard, Vancouver, ISO, and other styles

14

KUTTNER, T., and M. FELLER-KNIEPMEIER. "TEM investigation of the microstructure in a single crystal nickelbase superalloy creep tested in [011] orientation." Le Journal de Physique IV 03, no. C7 (1993): C7–325—C7–330. http://dx.doi.org/10.1051/jp4:1993748.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Schulze, Claudia, and Monika Feller-Kniepmeier. "Phase compositions and lattice misfit in CMSX-11B partition coefficients in single crystal nickelbase superalloys." Scripta Materialia 44, no. 5 (2001): 731–36. http://dx.doi.org/10.1016/s1359-6462(00)00670-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Kumar, S. T. G. Sampath, P. Ramesh Narayanan, K. G. Reddy, S. Arumugham, and T. S. Lakshmanan. "Failure of a Nickel Based Superalloy Thruster / Schadensuntersuchung an einem Raketenbauteil aus einer Nickelbasis-Superlegierung." Practical Metallography 29, no. 4 (1992): 213–19. http://dx.doi.org/10.1515/pm-1992-290406.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Nganbe, Michel, Martin Heilmaier та Ludwig Schultz. "Dependence of mechanical strength on grain structure in theγ' and oxide dispersion-strengthened nickelbase superalloy PM 3030". Zeitschrift für Metallkunde 96, № 6 (2005): 625–31. http://dx.doi.org/10.3139/146.101080.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Cieśla, M., F. Binczyk, M. Mańka, and R. Findziński. "The Influence of Macrostructure of Nickelbased Superalloys IN713C and MAR 247 on the Characteristics of High-temperature Creep." Archives of Foundry Engineering 14, no. 4 (2014): 11–16. http://dx.doi.org/10.2478/afe-2014-0077.

Full text

Abstract:

Abstract The study consisted in assessing the influence of surface and volume modification on the characteristics of high-temperature creep of castings made of waste products of nickel-based superalloys IN 713C and the MAR-247. The results of high-temperature creep tests performed under conditions of two variants of research were analysed. The characteristics of creep according to variant I were obtained on the basis of earlier studies of these alloys with the parameters T=982°C, σ=150MPa [1]. Variant II included carrying out creep tests of alloy IN713C with the parameters T=760°C, σ =400MPa and alloy MAR247 with the parameters: T=982°C, σ=200MPa.Developed creep characteristics were compared with the results of these alloys with the parameters according to variant I of the study. It was observed that the conditions of experiments carried out depending upon the value of the creep test temperature and stress with the creep stability depends on the size of the macrograin (I variant of the studies) or such influence was not observed (II variant of the studies). Stability of samples with coarse structure in variant I of creep tests was significantly higher than the samples with fragmented grain. It was found that the observed stability conditions are dependent on the dominant deformation mechanisms under creep tests carried out - diffusion mechanism in variant I and a dislocation mechanism in variant II of the study. The conditions for the formation and growth of the cracks in the tested materials, including the morphological characteristics of their macro-and microstructure were tested

APA, Harvard, Vancouver, ISO, and other styles

19

Saller, G., J. N. Bernauer, F. Wedl, and A. C. Kneissl. "Selektive Phasenkontrastierung in ausgewählten Nickelbasis- Superlegierungen / Selective Phase Contrasting in Chosen Nickel Base Superalloys." Practical Metallography 38, no. 7 (2001): 402–14. http://dx.doi.org/10.1515/pm-2001-380709.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Bäker, Martin, та Joachim Rösler. "Effects of alloying on the interface energy of the δ- and η-phase in nickelbase superalloys". Modelling and Simulation in Materials Science and Engineering 27, № 1 (2018): 015002. http://dx.doi.org/10.1088/1361-651x/aaefc1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Hrbälek, K., J. Kudrman, J. Hakl, and R. Pech. "The Structural Stability of the Nickel-Base Superalloy Cr15Ni70W10MoAlTiB at High Temperatures / Die Gefügestabilität der Nickelbasis-Superlegierung Cr15Ni70W10MoAlTiB bei hohen Temperaturen." Practical Metallography 22, no. 4 (1985): 171–85. http://dx.doi.org/10.1515/pm-1985-220403.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Liu, Yong, Xiujuan Wu, and Huanghai Kong. "Investigation of Electrochemical Nanostructuring with Ultrashort Pulses by Using Nanoscale Electrode." Current Nanoscience 15, no. 3 (2019): 279–88. http://dx.doi.org/10.2174/1573413714666180704110307.

Full text

Abstract:

Background: Electrochemical machining (ECM) is a non-traditional machining method for the metal material based on the principle of anode electrochemical dissolution which has been used in micro/nano fabrication with advantages as not influenced by materials intensity and hardness, no residual stress and no heat treatment born on the surface of the workpiece. Several researches and applications have shown that the surface quality can be improved effectively during the electrochemical machining by using ultrashort pulse power supply. Method: This paper presents a potential of electrochemical machining at the nanometer scale. First, a transient charging double layer mathematical model is developed to describe electrochemical nanostructuring of metallic materials with ultrashort (nanosecond) voltage pulses. And then, by using finite element method (FEM), the analysis model of electrochemical interface between poles is established to give a more realistic analysis of the comparison of transient currents at different separations between the tool and workpiece. Second, a nanoscale electrode is an essential tool in electrochemical nanostructuring. In this paper, electrodes with diameters of several ten to hundred nanometers are successfully prepared by the liquid membrane electrochemical etching. Finally, by using the nanometer scale electrodes above and the ultrashort pulse power supply, several nanostructures with physical dimension of several hundred nanometers are fabricated on nickelbased superalloys. Results: Using the optimal machining parameters, a tool electrode with 230 nm in diameter is obtained from the initial tungsten rod radius of 100 μm. By using 0.05 M H2SO4 solution, the pulse generator with 1μs in period, 100 ns in pulse on-time and 4 V in voltage, a micro/nano groove with the depth of 150 nm and maximum entrance width of 3 μm is obtained. Conclusion: Nanoscale electrodes with diameters of several ten to hundred nanometers is obtained successfully demonstrating that the liquid membrane electrochemical etching is a very effective method to fabricate nanoscale electrode. Several nanostructures with physical dimension of several hundred nanometers can be fabricated successfully demonstrating that ECM with ultrashort pulses is a highly promising nanostructuring technology.

APA, Harvard, Vancouver, ISO, and other styles

23

Baldan, Ahmet, and Jeffrey M. Benson. "Electron Microprobe Investigation of Carbides in an As-Cast Nickel-Based Superalloy Single Crystal / Mikrosondenuntersuchung der Carbide in gezogenen Einkristallen einer Nickelbasis-Superlegierung." International Journal of Materials Research 81, no. 6 (1990): 446–51. http://dx.doi.org/10.1515/ijmr-1990-810609.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Huda, Zainul, та Brian Ralph. "Mechanism of Grain Growth and Intergranular Precipitation of γ'ina Nickel Base Superalloy / Mechanismen des Kornwachstums und der intergranularen γ’-Ausscheidung in einer Nickelbasis-Superlegierung". Practical Metallography 27, № 2 (1990): 64–74. http://dx.doi.org/10.1515/pm-1990-270203.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Boncina, Tonica, Franc Zupanic, Alojz Krizman, Boštjan Markoli, and Savo Spaič. "Metallographic Preparation and Characterisation of the As-Cast Ni- Based Superalloy GMR 235 / Metallographische Präparation und Charakterisierung der Nickelbasis- Superlegierung GMR 235 im Gusszustand." Practical Metallography 41, no. 8 (2004): 373–85. http://dx.doi.org/10.1515/pm-2004-410802.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Srinivas, S., and M. C. Pandey. "Assessment of Microstructure in the Segregated Region of the Nickel-Base Superalloy 718 Using Various Etchants/ Gefügedarstellung in den Seigerungsbereichen der Nickelbasis- Superlegierung 718 mit Hilfe verschiedener Atzmittel." Practical Metallography 32, no. 3 (1995): 143–52. http://dx.doi.org/10.1515/pm-1995-320306.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Baldan, Ahmet. "The Effect of Initial y' Morphology on the High Temperature Creep Resistance of a Nickel-Based Superalloy / Der Einfluß von y’-Ausscheidungen auf die Hochtemperatur-Kriechfestigkeit einer Nickelbasis-Superlegierung." International Journal of Materials Research 83, no. 5 (1992): 324–30. http://dx.doi.org/10.1515/ijmr-1992-830508.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Baldan, Ahmet. "The Effect of Rafted y' Morphology on the Hish Temperature Creep Resistance of a Conventionally Cast Nickel-Based Superalloy / Der Einfluß der Morphologie von plattenförmigen y'-Ausscheidungen auf die Hochtemperaturkriechfestigkeit einer gegossenen Nickelbasis-Superlegierung." International Journal of Materials Research 83, no. 5 (1992): 331–37. http://dx.doi.org/10.1515/ijmr-1992-830509.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Nandam, Srinivasa Rao, A. Venugopal Rao, Amol A. Gokhale, and Suhas S. Joshi. "Experimental Study on Laser-Induced Surface Damage of a Single-Crystal Nickelbased Superalloy under CW Fiber Laser Scanning Process." Journal of Engineering Materials and Technology, April 1, 2022, 1–24. http://dx.doi.org/10.1115/1.4054228.

Full text

Abstract:

Abstract Single-crystal (SC) nickel-based superalloy castings offer high temperature mechanical properties that result in superior gas turbine engine performance and durability. These castings undergo various precision machining operations to remove a significant amount of material while manufacturing. Here, nickel-based superalloys are one of the most difficult materials to be cut. Therefore, novel concepts are being employed to improve their machinability including lowering their surface strength. This paper presents the introduction of laser-induced surface damage (LISD) on a second-generation SC nickel-based superalloy using a CW (continuous wave) fiber laser. Laser scanning experiments were performed on SC specimens in as-cast condition with a laser power of 1000 W, beam diameter of 1.2 mm and scanning speeds from 5.5 mm/s to 16.5 mm/s. The cross-sections of the laser irradiated surfaces were investigated by measuring the irradiated geometries (IRG), micro-structural changes, micro-segregations, solidification cracking and heat affected zone (HAZ). The IRG shows conduction mode of penetration with a high width-to-depth ratio under a bigger beam diameter and top-hat type beam profile. The IRG boundaries have irregular profiles due to the dissolution of inter-dendrite regions and eutectic phases. The IRG showed fine dendrites and solidification cracks with reduced micro-segregation levels. The solidification cracking is mainly attributed to thermal stresses and the micro-cracking in HAZ is attributed to the dissolution of low melting Mo and Ti eutectics. The evolved HAZ ranges from 15 to 20 % of the IRG depth. The LISD volume is evaluated as IRG plus HAZ for removal by machining process.

APA, Harvard, Vancouver, ISO, and other styles

30

P., Selva, Lorrain B., Alexis J., et al. "Multiaxial Fatigue Analysis of a High Performance Nickel-Based Superalloy." March 1, 2015. https://doi.org/10.5281/zenodo.1100132.

Full text

Abstract:

Over the past four decades, the fatigue behavior of nickel-based alloys has been widely studied. However, in recent years, significant advances in the fabrication process leading to grain size reduction have been made in order to improve fatigue properties of aircraft turbine discs. Indeed, a change in particle size affects the initiation mode of fatigue cracks as well as the fatigue life of the material. The present study aims to investigate the fatigue behavior of a newly developed nickel-based superalloy under biaxial-planar loading. Low Cycle Fatigue (LCF) tests are performed at different stress ratios so as to study the influence of the multiaxial stress state on the fatigue life of the material. Full-field displacement and strain measurements as well as crack initiation detection are obtained using Digital Image Correlation (DIC) techniques. The aim of this presentation is first to provide an in-depth description of both the experimental set-up and protocol: the multiaxial testing machine, the specific design of the cruciform specimen and performances of the DIC code are introduced. Second, results for sixteen specimens related to different load ratios are presented. Crack detection, strain amplitude and number of cycles to crack initiation vs. triaxial stress ratio for each loading case are given. Third, from fractographic investigations by scanning electron microscopy it is found that the mechanism of fatigue crack initiation does not depend on the triaxial stress ratio and that most fatigue cracks initiate from subsurface carbides.

APA, Harvard, Vancouver, ISO, and other styles

31

Saleh, Tarik A., Bjørn Clausen, Donald W. Brown, et al. "In situ Neutron Diffraction Studies of Carbide-Matrix Interactions in HAYNES® 230® Nickel Based Superalloy." MRS Proceedings 840 (2004). http://dx.doi.org/10.1557/proc-840-q7.3.

Full text

Abstract:

ABSTRACTHAYNES 230 is a solid solution strengthened, face centered cubic (FCC), nickelbased superalloy, with a small amount (1–5 vol. %) of semi-coherent FCC carbides. Neutron diffraction experiments were performed to study the interaction of the carbides with the matrix during tensile and compressive loading. The behavior of the elastic lattice strains during in situ loading clearly showed a tension-compression asymmetry. Although the volume percentage is small, the interaction between the carbides and the matrix had a significant effect on the load sharing. In compression, the carbides began load sharing at the macroscopic yield point, while the tension test suggests no load sharing. Debonding at the carbide-matrix interface is proposed to explain the lack of load sharing during the tensile loading based on the disparities observed between the experimental results and the finite element models.

APA, Harvard, Vancouver, ISO, and other styles

32

Duhl, David N. "Alloy Phase Stability Requirements in Single Crystal Superalloys." MRS Proceedings 186 (1990). http://dx.doi.org/10.1557/proc-186-389.

Full text

Abstract:

AbstractAlloy phase stability is a critical parameter in the design and implementation of nickel-base superalloys. To achieve the high temperature properties required of single crystal superalloys for application in gas turbine machinery, these alloys must have a stable gamma plus gamma prime microstructure for long periods of time at elevated temperatures. Significant deviation from this stable two phase microstructure, due to the precipitation of other phases, results in the loss of critical alloy properties which can have a deleterious impact on engine performance.Empirical methods based on the electron vacancy concept, commonly employed to predict and prevent the formation of undesirable topologically close packed (TCP) phases such as sigma or mu in polycrystalline nickelbase superalloys, are also used with single crystal superalloys. These undesirable phases result in the loss of alloy properties primarily as a result of the depletion of refractory strengthening elements from the superalloy matrix. The consequence of the formation of undesirable TCP phases on alloy properties and subsequent single crystal component behavior is reviewed.

APA, Harvard, Vancouver, ISO, and other styles

33

Bäker, Martin. "Understanding Element Solution Energies In Nickelbase Alloys Using Machine Learning." Materials Research Express, February 22, 2023. http://dx.doi.org/10.1088/2053-1591/acbe28.

Full text

Abstract:

Abstract The design of nickelbase superalloys requires to tune the content of diﬀerent phases with a composition of Ni3A, either to strengthen the alloy (γ′-phase, Ni3Al, γ′′-phase, Ni3Nb) or to inﬂuence its grain size and avoid embrittlement (δ-phase, Ni3Nb, η-phase, Ni3Ti). Here, we use a machine-learning-inspired approach to understand the inﬂuence of elemental properties on the energy of an alloying element in the respective phases. It is shown that the energy in γ′′, δ, and η can be ﬁtted well using the Bader charge and the volume of the element in a nickel matrix. In the case of γ′, the small lattice mismatch requires a ﬁt not involving the volume, but the bond order instead. We also show that the frequently used Md-parameter can be predicted from the properties of an element in a pure nickel matrix. Finally, the physical basis of the results is discussed in detail.

APA, Harvard, Vancouver, ISO, and other styles

34

"High-temperature strength of nickel-bsed superalloys for the construction of gas turbines from a metallographic point of view [hochwarmfestigkeit von nickelbasis-superlegierungen für den gasturbinenbau aus metallkund-licher sicht]Heine, N. Metall (1995) 49 (6), 393–398, 400." International Journal of Fatigue 18, no. 7 (1996): 510. http://dx.doi.org/10.1016/0142-1123(96)82760-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!