Temat: dendrites - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Effect of Water Mist Cooling of Casting Die on the Solidification, Microstructure and Properties of AlSi20 Alloy
Autorzy:: Władysiak, R.
Kozuń, A.
Pacyniak, T.
Powiązania:: https://bibliotekanauki.pl/articles/353825.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: silicon dendrites
casting die cooling
water mist
hypereutectic Al-Si alloy
Opis:: Unmodified AlSi20 alloy were casted at the research station, allowing for sequential multipoint cooling using a dedicated computer- controlled program. This method allows for the formation of the microstructure of hypereutectic AlSi20 alloy and also increases hardness. Primary silicon dendrites were found in the microstructure of cooled samples. Based on these dendrites, the formation of primary silicon particles is explained. Cooling of casting die with a water mist stream causes changes in solidification, which leads to expansion of the boundary layer with columnar crystals and shrinkage of the core zone with equiaxed crystals. It also causes more regular hardness distribution around pre-eutectic Si crystals, which can lead to tensile strength and machinability improvement.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 1; 187-194
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The influence of iron powder and disintegrated steel scrap additives on the solidification of cast iron
Wpływ dodatku proszku żelaza oraz rozdrobnionego złomu stalowego na krystalizację żeliwa
Autorzy:: Kopyciński, D.
Dorula, J.
Powiązania:: https://bibliotekanauki.pl/articles/264035.pdf
Data publikacji:: 2010
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: modyfikacja
żeliwo szare
dendryty
struktura
własności mechaniczne
inoculation
cast iron
dendrites
structure
mechanical properties
Opis:: The study proves that by introducing the iron powder and disintegrated steel scrap to low-sulphur cast iron still before the inoculation carried out with a conventional graphitising inoculant, the mechanical properties similar to those obtained during the inoculation treatment carried out on cast iron with the recommended high sulphur content are achieved. The said operation increases the number of crystallisation nuclei for dendrites of the primary austenite. In this case, the iron particles act as substrates for the nucleation of primary austenite gp due to a similar crystallographic behaviour of the regular face centered cubic lattice The more numerous are the dendrites of primary austenite, the less free space is available in the interdendritic spaces for the formation of graphite eutectic grains, which makes the structure more refined (more eutectic grains) and the mechanical properties higher.
W pracy wykazano, że wprowadzenie do żeliwa o niskiej zawartości siarki, jeszcze przed zabiegiem modyfikowania tradycyjnym modyfikatorem grafityzującym, proszku żelaza i/lub złomu stalowego w postaci rozdrobnionej, prowadzi do otrzymania podobnych właściwości wytrzymałościowych jak przy zabiegu modyfikowania dla żeliwa o zalecanej wyższej zawartości siarki. Zabieg ten zwiększa liczbę zarodków krystalizacji dendrytów austenitu pierwotnego. W tym przypadku cząstki żelaza spełniają rolę podkładek do zarodkowania austenitu pierwotnego ϒp wskutek podobieństwa krystalograficznego sieci regularnej (ściennie centrowanej). Im większa liczba dendrytów austenitu pierwotnego, tym mniej miejsca w przestrzeniach międzydendrytycznych na kształtowanie się ziaren eutektyki grafitowej, a w efekcie nieco drobniejsza struktura (większa liczba ziaren eutektycznych) oraz większe wartości właściwości wytrzymałościowych.
Źródło:: Metallurgy and Foundry Engineering; 2010, 36, 2; 97-104
1230-2325
2300-8377
Pojawia się w:: Metallurgy and Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of Tilted Columnar Dendrites at Grain Boundaries During Wire and Laser Additive Manufacturing: a Phase-Field Study
Autorzy:: Zong, Nanfu
Sun, Weizhao
Liang, Xinghong
Jing, Tao
Powiązania:: https://bibliotekanauki.pl/articles/27313866.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: wire and laser additive manufacturing
tilted columnar dendrites
overgrowth behavior
phase field simulation
grain boundary
Opis:: Tilted columnar dendritic morphologies are usually existed in wire and laser additive manufactured parts of GH3039 alloy. Overgrowth behaviors induced by the tilted dendritic arrays with a large tilted angle, and the effect of the angle between the growth direction and the direction vertical locally to the solid substrate on primary spacing, solute concentration and morphological evolution have been investigated at both the converging and the diverging grain boundaries through the phase-field simulation. The formation of cracking depends on solidification behaviors including columnar dendrites growth and micro-segregation in the interdendritic region. Furthermore, the effect of the tilted columnar dendrites on the susceptibility of crack is investigated during wire and laser additive manufacturing.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 2; 469--475
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of Alloying Elements on the Microstructure and Selected High-Temperature Properties of New Cobalt-Based L12-Reinforced Superalloys
Autorzy:: Kierat, Milena
Moskal, Grzegorz
Zieliński, Adam
Jung, Tymoteusz
Powiązania:: https://bibliotekanauki.pl/articles/2106594.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Co10Al5Mo2Nb
Co20Ni10Al5Mo2Nb
casting
primary microstructure
segregation
dendrites
Opis:: The study investigated the primary structure of the new generation of superalloys based on Co-10Al-5Mo-2Nb and Co-20Ni-10Al-5Mo-2Nb cobalt. Research on a group of cobalt-based materials was initiated in 2006 by J. Sato [1]. These materials may replace nickel-based superalloys in the future due to their excellent properties at elevated temperatures relative to nickel-based superalloys. The primary microstructure characterisation of the Co-10Al-5Mo-2Nb and Co-20Ni-10Al-5Mo-2Nb alloy are the basic subject of this article. The Co-10Al-5Mo-2Nb and Co-20Ni-10Al-5Mo-2Nb alloy are tungsten free alloys of a new type with the final microstructure based on the Co-based solid solution L12 phase of the Co3(Al,Mo,Nb) type as a strengthened structural element. The analysed alloys were investigated in an as-cast state after a vacuum casting process applied on graphite moulds. The primary microstructure of the alloys and the chemical constituent of dendritic and interdendritic areas were analysed using light, scanning electron and transmission microscopy. Currently, nickel-strengthened γ’ phase steels are still unrivalled in aerospace applications, however, cobalt based superalloys are a response to their existing limitations, which do not allow maintaining the current rate of development of aircraft engines.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 2; 495--500
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Microalloying of Continuous Cast Aluminum Strip and Structural Modification Using Plastic Treatment to a 9 μm Foil (Patent no. 39762, P-377/76)
Autorzy:: Purenović, M. M.
Purenović, Jelena M.
Baralić, J. Č.
Powiązania:: https://bibliotekanauki.pl/articles/2203751.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microalloying
modified continuous cast aluminum strip
nano oxide film
corrosion stability
plasticity
superplasticity
equiaxed structure
strain hardening
surface tension
crystallization zone
dendrites
crystal twinning
Opis:: Innovative procedure of microalloying continuous cast aluminum strip, thickness 10 mm, by Be, Zr and Mn using 3C Pechiney technology (no. 39762, P-377/76), and modifying the existing parameters for strip casting and crystallization was implemented under industrial conditions with two randomly selected batches 2×8 tones, without previous selection of standardized quality of aluminum, purity Al 99.5%, obtained by electrolysis. The application of microalloying and overall structural modification of the technology resulted in obtaining nanoscale, ultra-thin, compact oxide high-gloss film with uniform surface of continuous cast strip, instead of the usual thick and porous oxide film. The outcome of microalloying the obtained equiaxed fine-grained nano/micro structure was avoiding anisotropic and dendritic microstructure of the strip, and improving deformation and plastic properties of modified continuous cast strip subjected to the technology of plastic treatment by rolling until the desired foil thickness of 9 μm was obtained. The invention of microalloying and structural modification, including multiplying effect of several components, directly or indirectly, changed numerous structurally-sensitive properties. The obtained nano/micro structure of crystal grains with equiaxed structure resulted in the synergy of undesirable <111> and inevitable <100> and <110> textures. Numerous properties were significantly enhanced: elastic modulus was improved, and intensive presence of cracks in warm forming condition was prevented due to rapid increase of the number of grains to 10000 grains/cm2 in as-cast state.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 1; 345--357
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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