Autor: Roučka, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Controlled Precipitation Gaseous Cavities in Aluminium Castings
Autorzy:: Roučka, J.
Hotař, J.
Powiązania:: https://bibliotekanauki.pl/articles/380038.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aluminium alloy
porosity
shrinkage
gassing in melt
pore morphology
stop aluminium
porowatość gazowa
skurcz
Opis:: At thermal junctions of aluminium alloy castings and at points where risering proves to be difficult there appear internal or external shrinkages, which are both functionally and aesthetically inadmissible. Applying the Probat Fluss Mikro 100 agent, which is based on nano-oxides of aluminium, results in the appearance of a large amount of fine microscopic pores, which compensate for the shrinking of metal. Experimental tests with gravity die casting of AlSi8Cu3 and AlSi10Mg alloys have confirmed that the effect of the agent can be of advantage in foundry practice, leading to the production of castings without local concentrations of defects and without the appearance of shrinkages and macroscopic gas pores. Also, beneficial effect on the mechanical properties of the metal has been observed.
Źródło:: Archives of Foundry Engineering; 2015, 15, 4; 124-128
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Properties of Type SiMo Ductile Irons at High Temperatures
Autorzy:: Roučka, J.
Abramová, E.
Kaňa, V.
Powiązania:: https://bibliotekanauki.pl/articles/354702.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Si-Mo cast irons
mechanical properties at high temperatures
thermal stability of structure
oxidation resistance
Opis:: Ductile irons of the type of Si-Mo are characterized by increased resistance to long-term influence of high temperatures and cyclic temperature changes. They are mainly used in castings of combustion engine exhaust piping and other castings utilized at temperatures of up to 850°C. The aim of the study is to verify the mechanical properties of non-alloyed cast iron EN CSN GJS 450, SiMo4-0.5 and SiMo5-1 ductile irons at temperatures of 700 to 800°C, and the extent of their superficial oxidation after longterm annealing at a temperature of 900°C. Via chemical microanalysis the composition of oxidation products in the surface layer was evaluated.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 2; 601-607
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: The Influence of Lamellar Graphite Cast Iron Annealing on Hardness and Structure
Autorzy:: Roučka, J.
Prochazka, J.
Kana, V.
Krutis, V.
Nedelova, K.
Powiązania:: https://bibliotekanauki.pl/articles/380964.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cast iron
welding
annealing
cast iron hardness
structure stability
żeliwo
spawanie
wyżarzanie
twardość żeliwa
struktura
stabilność
Opis:: An analysis has been carried out of the influence of annealing time at the preheating temperature of 650 °C on the change in hardness and alloy structure of lamellar graphite cast iron in the working as well as in the laboratory conditions. This preheat temperature is common during reclaiming welding of castings with complex shapes. The changes in unalloyed cast iron EN-GJL 200 to EN-GJL 300 according to ISO 1690 standard and cast iron with low amount of elements such as Sn, Cu, Cr, and Mo and their combinations were assessed. It was found that the cast iron of higher strength grades has better hardness and structural stability. Cast iron alloyed with chromium or its combinations has the highest stability. In unalloyed cast iron, a partial degradation of pearlite occurs; in alloyed cast iron the structural changes are not conclusive.
Źródło:: Archives of Foundry Engineering; 2019, 4; 105-112
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

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