PL
 |
EN
Ten serwis zostanie wyłączony 2025-02-11.
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 63

Liczba wyników na stronie
first rewind previous Strona / 4 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 4 next fast forward last
1
Content available remote Bainitic nodular cast iron with carbides obtaining with use of Inmold method
100%
Gumienny G.
|
2009
|
tom Vol. 9, iss. 3
243-248
EN
In these paper bainitic nodular cast iron with carbides as-cast obtaining has been presented. This cast iron has been obtained with use of Inmold method. It was shown, that there is the possibility of bainite and carbides obtaining in cast iron with Mo and Ni for studied chemical composition.
2
Content available remote TDA method application to austenite transformation in nodular cast iron with carbides assessment
100%
Gumienny G.
|
2011
|
tom Vol. 11, iss. 3
159-166
EN
In this paper the possibility of TDA method using to austenite transformation in nodular cast iron with carbides assessment is presented. Studies were conducted on cast iron with about 2% molybdenum and 0,70% to 4,50% nickel. On diagrams, where TDA curves are presented, on time axis a logarithmic scale was applied. It has not been used up to now. It was found, that during cooling and crystallization of cast iron in TDA probe, on the derivative curve there is a slight thermal effect from austenite to upper bainite or martensite transformation. Depending on nickel concentration austenite upper bainite transformation start temperature changed (Bus), while MS temperature was independent of it. An influence of nickel on eutectic transformation temperature in nodular cast iron with carbides was determined too.
3
Content available Effect of the carbides and matrix on the wear resistance of nodular cast iron
100%
Gumienny G.
|
|
tom Vol. 13, iss. 3
25--29
EN
This paper presents the results of the abrasive wear resistance of selected types of nodular cast iron, including ADI, cooperating with quartz sand and 100 grit abrasive paper. It has been shown that carbides in nodular cast iron cause an increase in wear resistance of 6 to 12% depending on the surface fraction of the carbides and type of the matrix. For the same unit pressure the mass loss of the cast iron cooperating with quartz sand is many times larger than the cast iron cooperating with abrasive paper. For both abrasives the highest wear resistance showed nodular cast iron with upper and lower bainite and carbides.
4
Content available remote Chromium and copper influence on the nodular cast iron with carbides microstructure
100%
Gumienny G.
|
|
tom Vol. 10, iss. 4
47--54
EN
In this paper chromium to 1,00% and copper to 1,50% influence at constant molybdenum content of about 1,50% on the nodular cast iron with carbides microstructure has been presented. It was found, that as a result of synergic addition of above-mentioned elements there is the possibility obtaining an ausferrite in nodular cast iron with carbides castings. Conditions have been given, when in nodular cast iron with carbides at cooling at first in the form, then air-cooling austenite transformation to upper bainite, its mixture with lower bainite, martensite or ausferrite takes place. Transformations proceed during cooling and the crystallization of cast iron have been determined and the casting hardness has been presented.
5
Content available The effect of nodular cast iron metal matrix on the wear resistance
100%
Gumienny G.
|
2012
|
tom Vol. 12, iss. 2
179-186
EN
The paper presents results of studies on the effect of the nodular cast iron metal matrix composition on the abrasive and adhesive wear resistance. Nodular cast iron with different metal matrix obtained in the rough state and ADI were tested. To research of abrasive and adhesive wear the pearlitic and bainitic cast iron with carbides and without this component were chosen. The influence of the carbides amount for cast iron wear resistance was examined. It was found, that the highest abrasive and adhesive wear resistance under conditions of dry friction has a nodular cast iron with carbides with upper and lower bainite. Carbides in bainitic and pearlitic cast iron significantly increase the wear resistance in these conditions. In terms of fluid friction the largest wear resistance had cast iron group with the highest hardness.
6
Content available Carbidic bainitic and ausferritic ductile cast iron
100%
Gumienny G.
Archives of Metallurgy and Materials
|
2013
|
tom Vol. 58, iss. 4
1053--1058
EN
This article presents new kinds of carbidic ductile cast iron with different microstructures of the metal matrix. This cast iron was obtained using the Inmold method nodularisation which guarantees strong refining of graphite and the metal matrix components. A different microstructure of the metal matrix of the cast iron was obtained without any thermal treatment (unwrought) by a suitable composition of alloy additives. It was shown that by adding molybdenum, chromium, nickel and copper it is possible to obtain in the cast iron metal matrix consisting of upper bainite, its mixture with lower bainite or ausferrite in the casts with the wall thickness of 3/25 mm. The process of cast iron crystallization is presented and described with the help of the thermal and derivative analysis (TDA) curves. It also shows the thermal effects from transformation of austenite in solid state.
PL
W arty kule przedstawiono nowe rodzaje żeliwa sferoidalnego z węglikami o różnej mikrostrukturze osnowy metalowej. Żeliwo to otrzymano stosując sferoidyzację metodą Inmold. zapewniającą dużą liczbę kulek grafitu i rozdrobnienie składników osnowy metalowej. Różną mikrostrukturę osnowy metalowej żeliwa otrzymywano bez stosowania obróbki cieplnej (w stanie surowym) poprzez odpowiednią kombinację ilościową dodatków stopowych. Wykazano, że dodatek molibdenu, chromu, niklu i miedzi w żeliwie sferoidalnym pozwala uzyskać osnowę metalową złożoną z bainitu górnego, jego mieszaniny z dolnym lub ausferrytu w odlewach o grubości ściany 3-25 mm. Proces krystalizacji żeliwa przedstawiono i opisano za pomocą krzywych analizy termicznej i derywacyjnej (ATD). Pokazano efekty cieplne od przemiany austenitu w stanie stałym.
7
Content available Wear resistance of nodular cast iron with carbides
100%
Gumienny G.
|
2011
|
tom Vol. 11, iss. 3 spec.
81--88
EN
In this paper results of abrasive and adhesive wear resistance of selected grades of nodular cast iron with carbides are presented. It was demonstrated, that the maximum wear resistance has got nodular cast iron with the microstructure of upper bainite, lower bainite and carbides. This cast iron with hardened steel and sulfonitrided steel is the most advantageous friction pair during adhesive wear testing. It was found, that the least advantageous friction pair is pearlitic nodular cast iron with carbides and normalized steel.
8
Content available remote Bainitic-martensitic nodular cast iron with carbides
100%
Gumienny G.
|
2010
|
tom Vol. 10, iss. 2
63--68
EN
In this paper the possibility obtaining of upper bainite, lower bainite and martensite or their mixture in nodular cast iron with carbides has been presented. Conditions have been given, when in nodular cast iron with carbides for cooling at first in the form, then air-cooling austenite transformation to upper bainite, its mixture with lower bainite and martensite takes place. Transformations proceed during cooling and the crystallization of cast iron have been determined and the casting hardness has been presented.
9
Content available remote Carbides in nodular cast iron with Cr and Mo
63%
Pietrowski S. , Gumienny G.
|
2007
|
tom Vol. 7, iss. 3
223-230
EN
In these paper results of elements microsegregation in carbidic nodular cast iron have been presented. A cooling rate in the centre of the cross-section and on the surface of casting and change of moulding sand temperature during casting crystallization and its self-cooling have been investigated. TDA curves have been registered. The linear distribution of elements concentration in an eutectic grain, primary and secondary carbides have been made. It was found, that there are two kinds of carbides: Cr and Mo enriched. A probable composition of primary and secondary carbides have been presented.
10
Content available remote Bainite obtaining in cast iron with carbides castings
63%
Pietrowski S. , Gumienny G.
|
2010
|
tom Vol. 10, iss. 1
109-114
EN
In these paper the possibility of upper and lower bainite obtaining in cast iron with carbides castings are presented. Conditions, when in cast iron with carbides castings during continuous free air cooling austenite transformation to upper bainite or its mixture with lower bainte proceeds, have been given. A mechanism of this transformation has been given, Si, Ni, Mn and Mo distribution in the eutectic cell has been tested and hardness of tested castings has been determined.
11
Content available Continuous Cooling Transformation (CCT) Diagrams Of Carbidic Nodular Cast Iron
63%
Gumienny G. , Giętka T.
Archives of Metallurgy and Materials
|
2015
|
tom Vol. 60, iss. 2A
705--710
EN
This work presents continuous cooling transformation diagrams for different kinds of carbidic nodular cast iron. We investigated the cast iron, chemical composition of which in nodular cast iron allows the obtainment of a metal matrix which consists of: pearlite, upper bainite and its mixture with lower bainite, ausferrite and martensite when the casts were cooled in the mold. The influence of the rate of cooling on the obtained microstructure and hardness of the casts was shown. The work describes the influence of the alloy additives on the curves of austenite decomposition in the carbidic nodular cast iron. Diagrams were plotted which enable an understanding of the kinetics of the transformations of austenite in carbidic nodular cast iron. The diagrams also indicate the possibility of obtaining pearlite, bainite, martensite and ausferrite with the established chemical composition and the wall thickness of the cast.
PL
W pracy przedstawiono wykresy CTPc różnych rodzajów żeliwa sferoidalnego z węglikami. Zbadano żeliwo o składzie chemicznym zapewniającym uzyskanie w żeliwie sferoidalnym osnowy metalowej złożonej z: perlitu, bainitu górnego oraz jego mieszaniny z dolnym, ausferrytu i martenzytu przy studzeniu odlewów w formie. Pokazano wpływ szybkości studzenia na uzyskiwaną mikrostrukturę i twardość odlewów. Opisano wpływ dodatków stopowych na krzywe rozpadu austenitu w żeliwie sferoidalnym z węglikami. Opracowane wykresy umożliwią poznanie kinetyki przemian austenitu w żeliwie sferoidalnym z węglikami oraz ocenę możliwości uzyskania perlitu, bainitu, martenzytu i ausferrytu przy zadanym składzie chemicznym oraz grubości ściany odlewu.
12
Content available Alternatywna technologia otrzymywania ausferrytu w żeliwie sferoidalnym
63%
Gumienny G. , Kurowska B.
Prace Instytutu Odlewnictwa
|
2018
|
tom Vol. 58, no. 1
13--29
PL
W pracy przedstawiono wybrane zagadnienia z zakresu możliwości otrzymania ausferrytu w żeliwie sferoidalnym bez stosowania obróbki cieplnej odlewów. Osnowa ausferrytyczna zapewnia, poza wysokimi właściwościami mechanicznymi, wysoką odporność na zużycie ścierne i adhezyjne. Proponowana technologia zakłada modyfikację składu chemicznego, w wyniku której możliwe jest otrzymanie osnowy ausferrytycznej, przy studzeniu odlewów w formie. Grafit sferoidalny otrzymano w technologii Inmold. Do oceny procesu krystalizacji oraz przemiany w stanie stałym zastosowano analizę termiczną i derywacyjną (ATD). Przedstawiono badania wpływu wybranych dodatków stopowych dodawanych w różnych proporcjach na mikrostrukturę osnowy żeliwa. Wykazano możliwość otrzymania ausferrytu w odlewach z żeliwa sferoidalnego bez konieczności stosowania obróbki cieplnej. Zbadano odporność żeliwa na zużycie ścierne i adhezyjne.
EN
This study presents selected issues regarding the process of obtaining ausferrite from spheroidal cast iron without the application of thermal treatment to the casts. An ausferritic matrix, as well as strong mechanical properties, also ensures high abrasion and adhesion wear resistance. The proposed technology assumes that a change the chemical composition will take place, as a result of which it is possible to obtain an ausferritic matrix when the casts are cooled in the mould. Spheroidal graphite was obtained using Inmold technology. For the evaluation of the process of crystallization and transformation in the as-cast state, a thermal and derivational analysis (ATD) was carried out. Investigations of the effect of selected alloy additions in various proportions on the microstructure of the cast iron matrix were presented. It was demonstrated that it is possible to obtain ausferrite in spheroidal iron casts without the application of thermal treatment. The abrasion and adhesion wear resistance of cast iron was examined.
13
Content available remote Kontrola staliwa GXCrNi72-32 metodą ATD
63%
Pietrowski S. , Gumienny G.
Archiwum Odlewnictwa
|
2004
|
tom R. 4, nr 14
405-412
PL
W pracy przedstawiono możliwość kontroli produkcji staliwa GXCrNi72-32 metodą analizy termicznej i derywacyjnej (ATD). Wykazano, że zmiana zawartości węgla, chromu i niklu w staliwie powoduje zmianę temperatury krystalizacji poszczególnych faz, co umożliwia kontrolę wytapiania staliwa.
EN
In this paper the possibility of production controI of GXCrNi72-32 cast steel with TDA method is presented. It was demonstrated, that changes of carbon, chromium and nickeI contents have the influence on thermal effects and temperature of phases crystallization, what makes enable the controI of cast steel reduction.
14
Content available Copper in Ausferritic Compacted Graphite Iron
63%
Gumienny G. , Kacprzyk B.
Archives of Foundry Engineering
|
2018
|
tom Vol. 18, iss. 1
162--166
EN
This paper shows how it is possible to obtain an ausferrite in compacted graphite iron (CGI) without heat treatment of castings. Vermicular graphite in cast iron was obtained using Inmold technology. Molybdenum was used as alloying additive at a concentration from 1.6 to 1.7% and copper at a concentration from 1 to 3%. It was shown that ausferrite could be obtained in CGI through the addition of molybdenum and copper in castings with a wall thickness of 3, 6, 12 and 24 mm. Thereby the expensive heat treatment of castings was eliminated. The investigation focuses on the influence of copper on the crystallization temperature of the graphite eutectic mixture in cast iron with the compacted graphite. It has been shown that copper increases the eutectic crystallization temperature in CGI. It presents how this element influences ausferrite microhardness as well as the hardness of the tested iron alloy. It has been shown that above-mentioned properties increases with increasing the copper concentration.
15
Content available remote Żeliwo sferoidalne z węglikami
63%
Pietrowski S. , Gumienny G.
Archiwum Odlewnictwa
|
2006
|
tom R. 6, nr 19
233-238
PL
W pracy przedstawiono możliwość otrzymania węglików w żeliwie sferoidalnym stopowym z dodatkiem chromu, miedzi, niklu i molibdenu.
EN
In these paper the possibility obtaining carbides in ductile cast iron with chromium, nickel, copper and molybdenum have been presented.
16
Content available remote Crystallization of nodular cast iron with carbides
63%
Pietrowski S. , Gumienny G.
|
|
tom Vol. 8, iss. 4
236-240
EN
In this paper a crystallization process of nodular cast iron with carbides having a different chemical composition have been presented. It have been found, that an increase of molybdenum above 0,30% causes the ledeburutic carbides crystallization after ([alpha]+ graphite) eutectic phase crystallization. When Mo content is lower, these carbides crystallize as a pre-eutectic phase. In this article causes of this effect have been given.
17
Content available Microsegregation in nodular cast iron with carbides
63%
Pietrowski S. , Gumienny G.
|
2012
|
tom Vol. 12, iss. 4
127-134
EN
In this paper results of microsegregation in the newly developed nodular cast iron with carbides are presented. To investigate the pearlitic and bainitic cast iron with carbides obtained by Inmold method were chosen. The distribution of linear elements on the eutectic cell radius was examined. To investigate the microsegregation pearlitic and bainitic cast iron with carbides obtained by Inmold method were chosen. The linear distribution of elements on the eutectic cell radius was examined. Testing of the chemical composition of cast iron metal matrix components, including carbides were carried out. The change of graphitizing and anti-graphitizing element concentrations within eutectic cell was determined. It was found, that in cast iron containing Mo carbides crystallizing after austenite + graphite eutectic are Si enriched.
18
Content available remote Metodyka przygotowania oceny jakości żeliwa sferoidalnego z zastosowaniem metody ATD
63%
Pietrowski S. , Gumienny G.
Archiwum Odlewnictwa
|
2002
|
tom R. 2, nr 6
249-256
PL
Przedstawiono metodykę przygotowania oceny jakości żeliwa sferoidalnego. Jakość żeliwa określono charakterystyką grafitu oraz własnościami mechanicznymi: Rm, Rp0,2, A5 i HB. Opisano wykonanie i opracowanie krzywych ATD oraz kolejność postępowania w ocenie grafitu.
EN
We have elaborated the preparation way for quality assessment of ductile cast iron. Quality of ductile cast iron we have defined with graphite characteristic and mechanical properties: Rm, Rp0,2, A5 and HB. We have also elaborated the performance and the work out of TDA curves and the procedure with assessment of graphite.
19
Content available remote Ocena jakości żeliwa sferoidalnego EN-GJS-400-15 metodą ATD
63%
Pietrowski S. , Gumienny G.
Archiwum Odlewnictwa
|
2002
|
tom R. 2, nr 6
257-268
PL
Określono liczbę wydzieleń grafitu w funkcji jego kształtu oraz udział objętościowy grafitu w zależności od charakterystycznych parametrów krzywych ATD. Opracowano związki eksperymentalne dla określenia stopnia sferoidyzacji grafitu jak również własności mechanicznych żeliwa sferoidalnego.
EN
We have defined the number of graphite separations in funclion of its shape and the graphite separations share depending on the characteristic parameters of TDA curves. We have also delineated experimental relations necessary to define the degree of the spheroidization process as well as mechanical properties of ductile cast iron.
20
Content available remote Krystalizacja żeliwa sferoidalnego z dodatkami Mo, Cr, Cu i Ni
63%
Pietrowski S. , Gumienny G.
Archiwum Odlewnictwa
|
2006
|
tom R. 6, nr 22
406-413
PL
W pracy przedstawiono proces krystalizacji i mikrostrukturę żeliwa sferoidalnego stopowego z dodatkiem chromu, miedzi, niklu i molibdenu.
EN
In these paper the crystallization process and the microstructure of ductile cast iron with chromium, nickel, copper and molybdenum have been presented.
first rewind previous Strona / 4 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.