Autor: Górny, G. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ocena wpływu jakości regeneratu na parametry powierzchniowe odlewów
Evaluation of the Impact of Quality of Regenerated Sand on the Surface Parameters of Casting
Autorzy:: Dańko, R.
Holtzer, M.
Górny, G.
Powiązania:: https://bibliotekanauki.pl/articles/379636.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: powierzchnia
masa formierska
regenerat
surface
molding sand
reclaimed
Opis:: W artykule omówiono zagadnienie wpływu jakości samoutwardzalnej masy formierskiej z żywicą furfurylową na stan powierzchni odlewów testowych. Przed wykonaniem odlewów testowych, masy formierskie, z których przygotowano formy poddano badaniom mającym ocenię ich własności mogących mieć wpływ na stan odlewu, tzn. gazotwórczość, analizę granulometryczną, zawartość pierwiastków potencjalnie niebezpiecznych dla mikrostruktury odlewu oraz badania morfologii powierzchni ziarn regeneratów stosowanych do sporządzania mas formierskich. Wykonane w różnych masach formierskich odlewy poddano ocenie parametrów geometrycznych powierzchni, przeprowadzonych z wykorzystaniem aparatu TalyScan 150, firmy Taylor Hobson z wykorzystaniem oprogramowania TalyMap Expert v.2.0.19.
The article discusses the impact of the quality of self-hardening furan molding sand on the casting surface condition. Before performing the test casting, molding sands from which test molds were prepared were tested by the point of view of their properties which may affect the quality of the casting, ie. Gas evolution rate, granulometric analysis, the content of elements potentially dangerous for cast microstructure and surface morphology. Geometric parameters of castings made in a various molding sands were measured with using the camera TalyScan 150, Taylor Hobson and software TalyMap Expert v.2.0.19.
Źródło:: Archives of Foundry Engineering; 2014, 14, 2 spec.; 17-22
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Evaluation of the response to limited water, nitrogen and phosphorus supply in spring barley genotypes selected for vigorous seminal roots
Autorzy:: Gorny, A G
Powiązania:: https://bibliotekanauki.pl/articles/2047702.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nitrogen supply
selection
drought tolerance
barley genotype
Hordeum vulgare
phosphorus supply
Opis:: Fourteen F₅- and F₆-pedigrees, previously selected for a more vigorous seminal root system in a cross population of spring barley, were compared with their parents in the response to severe post-sowing drought and limited N- and P-supply. The materials were studied in glass-faced soil boxes, sand-vermiculite cultures and in the field. The F₅'s juvenile rooting superiority was not totally preserved for further growth stages suggesting partly different genetic backgrounds responsible for the seminal root system at various growth stages. Results indicated an absence of close genetic correlations between the seminal and adventitious root systems. The selected spring barley pedigrees exhibiting a more vigorous rooting benefit much more for their ability to avoid drought conditions than for their tolerance to nitrogen and phosphorus limitations. Especially under decreased N availability, the enhanced root extension in F₅ₛ resulted in a depressed shoot dry matter production. Despite a relatively low differentiation in the grain yield, some of the selected F₆-pedigrees were simultaneously found to indicate a high yield potential, an improved stability or tolerance to low-input.
Źródło:: Journal of Applied Genetics; 1996, 37, 1; 11-27
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Direct effects of cyclic selection for longer seminal roots in spring barley [Hordeum vulgare L.]
Autorzy:: Gorny, A G
Powiązania:: https://bibliotekanauki.pl/articles/2048122.pdf
Data publikacji:: 1995
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: selection
root length
cyclic selection
barley
spring barley
Hordeum vulgare
seminal root
root
realized heritability
Opis:: Cyclic pedigree selection for longer seminal roots was performed in the F₂, F₃ and F₄ generations of hybrid population of spring barley. The total length of roots was measured in seedlings grown in filter-paper rollers. The intensity of selection was 20% (C₁, C₂ cycles) and 26% (C₃). Selection was effective. On an average, the finally selected F₅-pedigrees formed 6% longer seminal root system than the initial F₂'s and much of them exhibited 7-16% improved rooting when compared with the best parent in a sand-vermiculite pot culture. Realized heritabilitiy coefficient of the root length ranged from 0.21 to 0.37 when assessed by the ratio of selection response to selection differential, while those estimated by the parent- offspring regressions attained 0.40-0.53. The obtained results suggest that progeny evaluation and/or selection delayed for later generations should be essential for more effective root selection in barley.
Źródło:: Journal of Applied Genetics; 1995, 36, 1; 17-26
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The influence of nutrient shortage on the expression of combining ability effects for root characters in spring barley [Hordeum vulgare L.]
Autorzy:: Gorny, A G
Powiązania:: https://bibliotekanauki.pl/articles/2043156.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: root system
water shortage
heritability
dominance
low-input breeding
mineral shortage
additivity
nutrient shortage
root size
genotype
barley
Hordeum vulgare
combining ability
Źródło:: Journal of Applied Genetics; 2000, 41, 2; 63-73
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Inheritance of water use efficiency in diallel hybrids of spring barley under varied nutrition and soil moisture
Autorzy:: Gorny, A G
Powiązania:: https://bibliotekanauki.pl/articles/2043864.pdf
Data publikacji:: 1999
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: inheritance
heritance
water
stress tolerance
climate condition
hybrid
barley
nutrition
spring barley
drought
Hordeum vulgare
low nutrition
diallel hybrid
soil moisture
Źródło:: Journal of Applied Genetics; 1999, 40, 1; 15-28
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Genotypic variation in response to iso-osmotic and soil moisture stresses among old and modern cultivars of winter wheat
Autorzy:: Mendel, M
Gorny, A G
Powiązania:: https://bibliotekanauki.pl/articles/2047709.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Triticum spelta
drought stress
mannitol
wheat
soil
old cultivar
transpiration
moisture stress
Triticum aestivum
modern cultivar
root
Opis:: The study was performed to evaluate range of the genotypie variation in drought susceptibility at juvenile growth stages among 23 old and modern winter cultivars of Triticum aestivum and one old cv. of T. spelta. Response of germinated seeds to mannitol-simulated drought stress as well as that in seedling shoot and root growth, water use and leaf transpiration under varied soil moisture were measured. Considerable genotypie variation for all morpho-physiological traits was found between wheat cultivars. There were significant differences between the older and modern cultivars. The former showed usually an enhanced rooting ability and higher water requirements, while the newer indicated more efficient water use. The older cultivars were more resistant to both iso-osmotic stress and low soil moisture at the juvenile growth stage. However, no clear differences were found between the two groups of cultivars in the variation range of the drought susceptibility indices. Complex patterns of the response to drought were observed. Cultivars, which distinguished by both a lower shoot : root ratio and a stronger drought-induced stimulative root growth, tended to be more resistant. Although only moderate the relationships noticed, a consideration of the root plasticity screening in local wheat breeding appears to be justified.
Źródło:: Journal of Applied Genetics; 1996, 37, 1; 49-63
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Effects of selection for more vigorous seminal roots in two cross populations of oat [Avena sativa L.]
Autorzy:: Gorny, A G
Szolkowska, A
Powiązania:: https://bibliotekanauki.pl/articles/2047233.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: vegetative growth
cross combination
nitrogen limitation
cross population
Avena sativa
root selection
root total length
drought
selection effect
seminal root
phosphorus limitation
oat
water deficit
Opis:: Three steps of multi-stage selection for more vigorous seminal roots were done in two cross combinations of oat. The total length of roots (TRL) was measured in seedlings of the F₂, F₃ and F₄ generations grown in filter-paper rollers. On average, the finally selected F₅ (or F₆) progenies distinguished by 7-11% improved rooting ability than their midparents. Transgressive forms were selected only in one cross combination. Coefficients of realized heritability for TRL were low and ranged from 0.08 to 0.42 indicatinga relatively high proportion of non-additive gene effects in the variance of TRL. Tolerance of the F₆-progenies to water and nutrient limitations was evaluated in pot and field experiments. Correlated selection effects were dependent upon initial cross combination. Only progenies from one cross combination exhibited an improved drought tolerance at the 8-9 Feekes' stage. The both enhanced rooting and decreased S : R ratio of the F₆-progenies correlated with their improved tolerance to reduced P supply at the 4-leaf stage. However, no significant consistence occurred between indices of the tolerance to reduced nutrition at the vegetative growth and those at field maturity. Performed root selection identified more frequently high yielding genotypes with less stable grain yield. No progenies were obtained that outperform their parents under low-input conditions. It was emphasized that root selection should be accompanied by selection for integrated response components.
Źródło:: Journal of Applied Genetics; 1996, 37, 4; 331-344
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Effect of Modification and Cooling Rate on Primary Grain in Al-Cu Alloy
Autorzy:: Górny, M.
Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/383080.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: modification
cooling rate
aluminium alloys
grain refinement
modyfikacja
szybkość chłodzenia
stopy aluminium
rozdrobnienie ziarna
Opis:: This paper presents a study of the effect of the modification and coolingrate on the grain countα(Al) in the Al-5Cu alloy. Research was performed on castings with walls thickness between 3 mm and 25 mm. Cooling curves were recorded to determine the cooling rate and the degree of undercooling at the beginning of solidification. It has been shown that cooling rate increases exponentially as the wall thickness of casting decreases. Moreover it has been demonstrated that the cooling rate of castings changes within a wide range (21ºC/s - 1ºC/s) when the wall thickness changes from 3 up to 25 mm. Metallographic examinations revealed primary grains (primary α(Al) grains).The paper show that the relationship between the grain count and the degree of undercooling (for non-modified and modified alloys) can be represented by the equation N = Nv = np·exp(-b/_Tα), based on the Weibull's distribution of the size of nucleation sites.
Źródło:: Archives of Foundry Engineering; 2014, 14, 3; 21-24
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Wpływ szybkości stygnięcia na liczbę ziaren pierwotnych stopu Al-5Cu
The Influence of Cooling Rate on the Number of Primary Grains in Al-5Cu Alloy
Autorzy:: Górny, M.
Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/379829.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: metalografia
szybkość stygnięcia
mikrostruktura stopu
stop aluminium
metallography
cooling rate
alloy microstructure
aluminium alloy
Opis:: W niniejszej pracy zbadano zagadnienie wpływu szybkości stygnięcia na liczbę ziaren pierwotnych α(Al) w stopie Al-5Cu. Badania przeprowadzono dla odlewów o grubości ścianek z zakresu 3-25 mm. W celu wyznaczenia szybkości stygnięcia oraz stopnia przechłodzenia na początku krystalizacji zarejestrowano krzywe stygnięcia. Badania wykazały, że szybkość stygnięcia zwiększa się ekspotencjalnie w miarę zmniejszania grubości ścianki odlewu. Z przeprowadzonych badań wynika, że szybkość stygnięcia odlewów zmienia się w szerokim zakresie (21,5-1,6 ºC/s) przy zmianie grubości ścianki od 3-25 mm. Przeprowadzono badania metalograficzne celem określenia gęstości ziaren pierwotnych (liczby ziaren pierwotnych α(Al) na jednostkę objętości). Przedstawiono zależności wiążące liczbę ziaren pierwotnych z szybkością stygnięcia, a także ze stopniem przechłodzenia (ΔT_m= T_e-T_min, gdzie T_e - równowagowa temperatura krystalizacji (likwidus), T_min - minimalna temperatura na początku krystalizacji fazy α(Al)). Badania wykazały, że liczbę ziaren pierwotnych można opisać z wysokim współczynnikiem korelacji za pomocą zależności potęgowej w funkcji szybkości stygnięcia.
This paper investigated the influence of cooling rate on the number of primary grains α(Al) in Al-5Cu alloy. The study was conducted on castings with wall thickness in the range of 3-25 mm. In order to determine cooling rate and maximum undercooling at the beginning of the solidification the cooling curves were recorded. Research has shown that the cooling rate increases exponentially with decreasing wall thickness of the casting. Moreover it has been shown that the cooling rate of castings varies widely (21.5-1.6 °C / s) when changing the wall thickness from 3 up to 25 mm. Metallographic studies were performed to determine the primary grain density (the number of grains of primary α(Al) per unit volume). The relationship combining the number of primary grains with the cooling rate and maximum undercooling (ΔTm=T_e-T_min, where T_e - equilibrium solidification temperature (liquidus), T_min - minimum temperature at the beginning of the solidification of α(Al) phase). Research has also shown that the number of primary grains can be described with a high correlation coefficient by the power function of the cooling rate.
Źródło:: Archives of Foundry Engineering; 2013, 13, 3 spec.; 25-30
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Weryfikacja modeli heterogenicznego zarodkowania ziaren pierwotnych w stopie Al-5Cu
Verification of Models of Heterogeneous Nucleation of Primary Grains in Al-5Cu Alloy
Autorzy:: Górny, M.
Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/381989.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: zarodkowanie heterogeniczne
modele zarodkowania
gęstość ziaren pierwotnych
przechłodzenie ciekłego stopu
rozkład statystyczny
heterogeneous nucleation
nucleation models
density of the original grain
supercooling a molten
statistical distribution
Opis:: Gęstość ziaren pierwotnych Nv po krystalizacji zależy od maksymalnego przechłodzenia ΔT ciekłego stopu. Zależność ta może być oparta o różne rozkłady statystyczne: Gaussa, Weibulla, lognormalny oraz zależy od charakterystyki heterogenicznych miejsc zarodkowania oraz ich aktywnej liczby obecnej w ciekłym stopie odlewniczym. Celem niniejszej pracy jest skonfrontowanie wyników doświadczalnych z istniejącymi już modelami Oldfielda, Frasia, lognormalnego oraz wyznaczenie wartości parametrów zarodkowania tych modeli, które są charakterystyczne dla badanego stopu Al-5Cu. Zweryfikowano modele zarodkowania ziaren fazy pierwotnej α(Al) w stopie Al-5Cu w stanie wyjściowym oraz modyfikowanym. Z przeprowadzonej analizy wynika, że model Oldfielda wykazuje dobrą zgodność z wynikami doświadczalnymi, ale tylko dla stanu wyjściowego, podczas gdy modele lognormalny oraz Frasia (oparty na rozkładzie statystycznym Weibulla) są równoważne pod względem dobrego odwzorowania wyników doświadczalnych dla zarodkowania ziaren fazy pierwotnej α(Al) w stopie Al-5Cu zarówno dla stanu wyjściowego jak i modyfikowanego.
The grain density Nv after solidification is a function of maximum undercooling of a liquid alloy ΔT. This relationship may be based on the different statistical distributions: Gaussian, Weibull, Lognormal and depends on the characteristics of heterogeneous nucleation sites present in the liquid alloy. The purpose of this work was a compare the experimental data with the models: Oldfield, Fras and Lognormal and determination the nucleation parameters of these models, which are characteristic for the investigated alloy Al-5Cu. The models of nucleation of primary grains α(Al) in the alloy Al-5Cu was verified for two physicochemical state of liquid metal: base and refined. The analysis shows that the model Oldfield has a good compatibility with experimental results, but only for the base alloy. The lognormal and Fras (based on Weibull's distribution) models are equivalent as regards a good representation of the experimental results of the nucleation of primary grains α(Al) in the alloy Al-5Cu for both physicochemical state.
Źródło:: Archives of Foundry Engineering; 2014, 14, 4 spec.; 31-36
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Effect of Cooling Rate on Microstructure of Thin-Walled Vermicular Graphite Iron Castings
Autorzy:: Górny, M.
Kawalec, M.
Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/380738.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative materials
vermicular graphite cast iron
cooling rate
thermal analysis
microstructure
innowacyjne technologie odlewnicze
materiały innowacyjne
żeliwo grafitowe wermikularne
chłodzenie
analiza termiczna
mikrostruktura
Opis:: This article addresses the effect of cooling rate and of titanium additions on the microstructure of thin-walled vermicular graphite iron (TWCI) castings as determined by changing molding media, section size and Ferro Titanium. The research work was carried out on TWCI castings and reference castings of 2-5 mm and 13-mm wall thickness, respectively. Various molding materials were employed (silica sand and insulating sand ‘‘LDASC’’) to achieve different cooling rates. Thermal analysis was implemented for determinations of the actual cooling rates at the onset of solidification. This study shows that the cooling rates exhibited in the TWCI castings varies widely (70- 14oC/s) when the wall thickness is changed from 2 to 5 mm. In turn, this is accompanied by a significant variation in the vermicular graphite fraction. The resultant cooling rates were effectively reduced by applying an insulating sand in order to obtain the desired vermicular graphite shape. In addition, good agreement was found between the theoretical predictions of the solidification process and the experimental outcome. Ti additions in combination with LDASC sand molds were highly effective in promoting the development of over 80 % vermicular graphite in castings with wall thicknesses of 2 and 3 mm as evidenced by quantitative metallographic analyses.
Źródło:: Archives of Foundry Engineering; 2014, 14, 1 spec.; 139-142
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy
Autorzy:: Górny, M.
Sikora, G.
Kawalec, M.
Powiązania:: https://bibliotekanauki.pl/articles/381182.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: quality management
Al-Cu alloy
fading effect
primary grains of α(Al)
zarządzanie jakością
metalografia
stop Al-Cu
zanik
ziarna pierwotne
Opis:: The present research was conducted on thin-walled castings with 5 mm wall thicknesses. This study addresses the effect of the influence of different master alloys, namely: (1) Al-5%Ti-1%B, (2) Al-5%Ti and (3) Al-3%B, respectively on the structure and the degree of undercooling (ΔTα = Tα-Tmin, where Tα - the equilibrium solidification temperature, Tmin - the minimum temperature at the beginning of α(Al) solidification) of an Al-Cu alloy. The process of fading has been investigated at different times spent on the refinement treatment ie. from 3, 20, 45 and 90 minutes respectively, from the dissolution of master alloys. A thermal analysis was performed (using a type-S thermocouple) to determine cooling curves. The degree of undercooling and recalescence were determined from cooling and solidification curves, whereas macrostructure characteristics were conducted based on a metallographic examination. The fading effect of the refinement of the primary structure is accompanied by a significant change in the number (dimension) of primary grains, which is strongly correlated to solidification parameters, determined by thermal analysis. In addition to that, the analysis of grain refinement stability has been shown with relation to different grain refinements and initial titanium concentration in Al-Cu base alloy. Finally, it has been shown that the refinement process of the primary structure is unstable and requires strict metallurgical control.
Źródło:: Archives of Foundry Engineering; 2016, 16, 3; 35-38
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Anisotropic in Situ Metal Matrix Composite Reinforced with VC Carbide Fibres
Autorzy:: Kawalec, M.
Górny, M.
Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/381579.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cast composite
directional solidification
vanadium eutectic
vanadium carbide
microstructure
kompozyt odlewany
krzepnięcie kierunkowe
węglik wanadu
Opis:: A eutectic reaction is a basic liquid-solid transformation, which can be used in the fabrication of high-strength in situ composites. In this study an attempt was made to ensure directional solidification of Fe-C-V alloy with hypereutectic microstructure. In this alloy, the crystallisation of regular fibrous eutectic and primary carbides with the shape of non-faceted dendrites takes place. According to the data given in technical literature, this type of eutectic is suitable for the fabrication of in-situ composites, owing to the fact that a flat solidification front is formed accompanied by the presence of two phases, where one of the phases can crystallise in the form of elongated fibres. In the present study an attempt was also made to produce directionally solidifying vanadium eutectic using an apparatus with a very high temperature gradient amounting to 380 W/cm at a rate of 3 mm/h. Alloy microstructure was examined in both the initial state and after directional solidification. It was demonstrated that the resulting microstructure is of a non-homogeneous character, and the process of directional solidification leads to an oriented arrangement of both the eutectic fibres and primary carbides.
Źródło:: Archives of Foundry Engineering; 2015, 15, 1; 21-24
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Influence of Structure on the Thermophisical Properties of Thin Walled Castings
Autorzy:: Górny, M.
Lelito, J.
Kawalec, M.
Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/382519.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: solidification process
thin walled casting
graphite morphology
thermal diffusivity
specific heat
thermal conductivity
proces krzepnięcia
odlew cienkościenny
morfologia grafitu
dyfuzyjność termiczna
ciepło właściwe
przewodność cieplna
Opis:: This study addresses the effect of the cooling rate and of titanium additions on the thermophysical parameters of thin-walled compacted graphite iron (TWCGI) castings. Various molding materials were used (silica sand and insulating sand LDASC- Low-Density Alumina-Silicate Ceramic) to achieve different cooling rates. Different titanium additions were caused by various amount of Ferro Titanium. The research work was conducted for thin-walled iron castings with a 3-mm wall thickness. The tested material represents the occurrence of graphite in the shape of flakes (C and D types, according to the ISO Standard), nodules or compacted graphite with a percent of nodularity and different shape factor. Thermal conductivity has been determined by the laser flash technique in a temperature range of 22-600°C. The results show that the cooling rates together with the titanium content largely influence the graphite morphology and finally thermal conductivity of thin walled iron castings.
Źródło:: Archives of Foundry Engineering; 2015, 15, 2 spec.; 23-26
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: The Influence of Wall Thickness and Mould Temperature on Structure and Properties of Thin Wall Ductile Iron Castings
Autorzy:: Górny, M.
Kawalec, M.
Witek, G.
Rejek, A.
Powiązania:: https://bibliotekanauki.pl/articles/382589.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: metallography
mechanical properties
ductile iron
austenitic ductile iron
high Ni alloying
mould temperature
thin wall casting
metalografia
właściwości mechaniczne
metal ciągliwy
żeliwo sferoidalne
Opis:: The excellent property combination of thin wall ductile iron castings (TWDI), including thin wall alloyed cast iron (e.g. austenitic TWDI) has opened new horizons for cast iron to replace steel castings and forgings in many engineering applications with considerable cost benefits. TWDI is considered as a potential material for the preparation of light castings with good mechanical and utility properties, the cost of which is relatively low. In this study, unalloyed and high Ni-alloyed (25% Ni) spheroidal graphite cast iron, with an austenitic metallic matrix were investigated. The research was conducted for thin-walled iron castings with 2, 3 and 5mm wall thickness, using different mould temperature (20°C, and 160°C) to achieve various cooling rates. The metallographic examinations i.e. characteristic of graphite nodules, metallic matrix, and primary grains of austenite dendrites (in high-nickel NTWDI) and mechanical properties were investigated. The study shows that homogeneity of the casting structure of thin-walled castings varies when changing the wall thickness and mould temperature. Finally, mechanical properties of thin-walled ductile iron castings with ferritic-pearlitic and austenitic metallic matrix have been shown.
Źródło:: Archives of Foundry Engineering; 2019, 2; 55-59
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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