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Wyświetlanie 1-8 z 8
Tytuł:
Wpływ zabiegu modyfikowania zaprawą ZnTi3,2 na mikrostrukturę stopu ZnAl10
Influence of the Modification by ZnTi3,2 Grain-Refiner on the ZnAl10 Alloy Microstructure
Autorzy:
Piwowarski, G.
Buraś, J.
Krajewski, W. K.
Powiązania:
https://bibliotekanauki.pl/articles/381412.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stop cynku
rozdrabnianie ziarna
modyfikacja stopu
analiza termiczna
mikrostruktura stopu
zinc alloy
grain refining
modification of alloy
thermal analysis
alloy microstructure
Opis:
Publikacja dotyczy zabiegu modyfikowania podwójnych stopów Zn o średniej zawartości aluminium dodatkiem zaprawy zawierającej tytan i obejmuje badania wpływu zabiegu modyfikowania na stopień rozdrobnienia mikrostruktury stopu Zn-10% mas. Al (ZnAl10) odlewanego do formy piaskowej. Badany stop został rozdrabniany zaprawą modyfikującą Zn – 3,2% mas. Ti, wprowadzającą do metalu Ti. Na podstawie dokonanej oceny obrazów mikrostruktury stopu wyjściowego niemodyfikowanego i zmodyfikowanego zmiennym dodatkiem Ti zawartego w zaprawie modyfikującej stwierdzono, że zastosowana zaprawa modyfikująca powoduje określone, w zależności od ilości wprowadzonego do stopu Ti, rozdrobnienie ziarna stopu w stosunku do stopu wyjściowego niemodyfikowanego. Z kolei wyniki uzyskane w przeprowadzonej analizie termicznej potwierdzają zarodkotwórcze działanie użytej do badań zaprawy.
The paper deals with grain-refinement of the sand-cast binary medium-aluminium Zn-10 mas. % alloy (ZnAl10) by using the Zn-3.2 mas. %Ti master alloy. Basing on the structure analysis it was stated that the master alloy causes significant grain-refinement in comparison with the initial, no modified alloy. Thermal analysis of the cooling curves stated that the modified alloys had increased nucleation temperatures and, at the same time, decreased recalescence – which proves nucleating action of the Zn-3.2 mas. %Ti master alloy in the examined alloy.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 129-132
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Grain Refinement and Feeding Quality on Damping Properties of the Al-20Zn Cast Alloy
Autorzy:
Krajewski, W. K.
Faerber, K.
Krajewski, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/380999.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-zinc aluminium alloy
grain refinement
feeding quality
damping properties
wysokocynkowy stop aluminium
rozdrobnienie ziarna
właściwości tłumiące
Opis:
The paper presents relationships between the degree of structure fineness and feeding quality of the Al – 20 wt.% Zn (Al-20 Zn) alloy cast into a mould made from sand containing silica quartz as a matrix and bentonite as a binder, and its damping coefficient of the ultrasound wave at frequency of 1 MHz. The structure of the examined alloy was grain refined by the addition of the refining Al-3 wt.% Ti – 0.15 wt.%C (TiCAl) master alloy. The macrostructure analysis of the initial alloy without the addition of Ti and the alloy doped with 50-100 ppm Ti as well as results of damping experiments showed that the structure of the modified alloy is significantly refined. At the same time, its damping coefficient decreases by about 20-25%; however, it still belongs to the so called high-damping alloys. Additionally, it was found that despite of using high purity metals Al and Zn (minimum 99,99% purity), differences in the damping coefficient for samples cut from upper and bottom parts of the vertically cast rolls were observed. These differences are connected with the insufficient feeding process leading to shrinkage porosity as well as gases present in metal charges which are responsible for bubbles of gas-porosity.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 209-214
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Analysis of the ZnAl10 Alloy Modified by Ti Additions in AlTi5C0.15 and ZnTi3.2 Inoculants
Autorzy:
Piwowarski, G.
Buraś, J.
Krajewski, W. K.
Krajewski, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/383098.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy ZnAl
grain refinement
thermal analysis
inoculants
modified by Ti
stop ZnAl
ziarna
analiza termiczna
modyfikatory
Opis:
Cast alloys on the Zn matrix and of an increased Al content are characterised by good technological and mechanical properties, due to which they should meet special, more demanding requirements. However, the basic problem in these alloys technology, apart from a high tendency for gases pick-up and oxidation of liquid metals, is a tendency to form coarse-grained dendritic structures in castings solidifying in sand moulds, what - in turn - unfavourably influences their plastic properties [1, 2, 7, 11]. Therefore several treatments aimed at obtaining fine-grained structure and improving plastic properties are applied in these alloys technology. The presented study concerns the modification process of binary, middle-aluminium Zn alloys performed by additions of inoculants containing titanium and investigations of these modifications influence on the structure refinement degree. The Zn-10wt% Al (ZnAl10) alloy modified, before pouring into a sand mould, either by addition of the traditional inoculant i.e. Al-3wt% Ti-0.15wt% C (AlTi3C0.15 – TiCAl) or the new inoculant Zn-3.2wt% Ti (ZnTi3.2) was tested. Within investigations the thermal analysis was performed, especially cooling curves and their first derivatives, and also measurements by means of the differential scanning calorimetry (DSC), with a purpose of determining the modification influence on undercooling degree changes. Microstructures of the tested alloy were observed by the light microscopy (LM). The applied modification of middle-aluminium zinc alloys by AlTi3C0.15 and ZnTi3.2 inoculants causes a significant refinement of the alloy structure. Inoculants applied in investigations have a strong nucleating activity, which is confirmed by decreasing of undercooling and the temperature recalescence in cooling curves, which occurs simultaneously with grain refinements.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4 spec.; 101-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasound Wave Attenuation of Grain Refined High – Zinc Aluminium Sand-cast Alloys
Autorzy:
Krajewski, W. K.
Buraś, J.
Krajewski, P. K.
Piwowarski, G.
Powiązania:
https://bibliotekanauki.pl/articles/379936.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high zinc Al alloy
sand casting
grain refinement
damping capacity
attenuation
ultrasound wave
strength properties
stop wysokocynkowy
stop Al
odlew piaskowy
rozdrobnienie ziarna
tłumienie
fala ultradźwiękowa
właściwości wytrzymałościowe
Opis:
The paper presents results of measuring attenuation coefficient of the Al-20 wt.% Zn alloy (AlZn20) inoculated with different grain refiners. During experiments the melted alloys were doped with Al-Ti3-C0.15 refining master alloy. Basing on measurements performed by Krautkramer USLT2000 device with 1MHz ultrasound wave frequency it was stated that grain refinement reduces the attenuation coefficient by about 20-25%. However, the examined alloys can be still classified as the high-damping ones of attenuation greater than 150 dB/m.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 51-54
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Grain-refinement on Zn-10Al Alloy Damping Properties
Autorzy:
Piwowarski, G.
Krajewski, P. K.
Buraś, J.
Krajewski, W. K.
Powiązania:
https://bibliotekanauki.pl/articles/381530.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zinc-aluminium cast alloys
inoculation
grain refinement
damping
attenuation coefficient
stopy cynk-aluminium
uszlachetnianie stopów
współczynnik tłumienia
Opis:
The paper is devoted to grain-refinement of the medium-aluminium zinc based alloys (MAl-Zn). The system examined was sand cast Zn-10 wt. %. Al binary alloy (Zn-10Al) doped with commercial Al-3 wt. % Ti – 0.15 wt. % C grain refiner (Al-3Ti-0.15C GR). Basing on the measured attenuation coefficient of ultrasonic wave it was stated that together with significantly increased structure fineness damping decreases only by about 10 – 20%. The following examinations should establish the influence of the mentioned grain-refinement on strength and ductility of MAl-Zn cast alloys.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 91-94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damping properties vs. structure fineness of the high-zinc aluminum alloys
Autorzy:
Krajewski, W. K.
Haberl-Faerber, K.
Buras, J.
Krajewski, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/380214.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wysokocynkowy stop aluminium
rozdrobnienie ziarna
właściwości tłumiące
współczynnik tłumienia
high zinc aluminum alloys
grain refinement
damping properties
damping coefficient
Opis:
The subject of this study is the presentation of relation between the degree of structure fineness and ultrasonic wave damping coefficient for the high-zinc aluminium alloys represented in this study by the sand mould cast alloy Al - 20 wt% Zn (AlZn20). The studied alloy was refined with a modifying (Al,Zn)-Ti3 ternary master alloy, introducing Ti in the amount of 400 pm into metal. Based on the analysis of the initial and modified alloy macrostructure images and ultrasonic testing, it was found that the addition of (Al,Zn)-Ti3 master alloy, along side a significant fragmentation of grains, does not reduce the coefficient of ultrasonic waves with a frequency of 1MHz.
Źródło:
Archives of Foundry Engineering; 2012, 12, 3; 63-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Temperature Thermal Properties of Bentonite Foundry Sand
Autorzy:
Krajewski, P. K.
Suchy, J. S.
Piwowarski, G.
Krajewski, W. K.
Powiązania:
https://bibliotekanauki.pl/articles/380747.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting
solidification
bentonite sand mould
thermophysical properties
odlewanie
krzepnięcie
piasek formierski
bentonit
właściwości termofizyczne
Opis:
The paper presents results of measuring thermal conductivity and heat capacity of bentonite foundry sand in temperature range ambient – 900 °C. During the experiments a technical purity Cu plate was cast into the green-sand moulds. Basing on measurements of the mould temperature field during the solidification of the casting, the temperature relationships of the measured properties were evaluated. It was confirmed that water vaporization strongly influences thermal conductivity of the moulding sand in the first period of the mould heating by the poured casting.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 47-50
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural stability of the high-aluminium zinc alloys modified with Ti addition
Autorzy:
Krajewski, W. K.
Zak, P. L.
Orava, J.
Greer, A. L.
Krajewski, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/382429.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wysokoaluminiowy stop cynku
dodatek Ti
stabilność strukturalna
high-aluminium zinc alloys
Ti addition
structural stability
XRD examinations
Opis:
The subject of the paper is structural stability of the Zn-26 wt.% Al binary alloys doped with 2.2 wt.% Cu or 1.6 wt.% Ti addition. The structural stability of Zn-Al alloys with increased Al content is connected with stability of solid solution of zinc in aluminium [...] , which is the main component of these alloys microstructure. Such a solution undergoes phase transformations which are accompanied, among others, by changes in dimensions and strength properties. The structural stability of the ZnAL26Cu2.2 and ZnAl26Ti1.6 alloys was investigated using XRD examinations during long term natural ageing after casting, as well as during long term natural ageing after super-saturation and quenching. On the basis of the performed examinations it was stated that small Ti addition to the binary ZnAl25 alloy, apart from structure refinement, accelerates decomposition of the primary [...] phase giving stable structure in a shorter period of time in comparison with the alloy without Ti addition. Addition of Ti in amount of 1.6 wt.%, totally replacing Cu, allows obtaining stable structure and dimensions and allows avoiding structural instability caused by the metastable [...] CuZn4 phase present in the ZnAl26Cu2.2 alloy.
Źródło:
Archives of Foundry Engineering; 2012, 12, 1; 61-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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