Autor: Parzych, S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Effect of Heat Treatment on Microstructure and Mechanical Properties of Cast Bainitic Steel Used for Frogs in Railway Crossovers
Autorzy:: Parzych, S.
Powiązania:: https://bibliotekanauki.pl/articles/355415.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: railway crossover
bainitic cast steel
heat treatment
mechanical properties
Opis:: This work deals with the effect of heat treatment on a microstructure and mechanical properties of a selected cast steel assigned as a material used for frogs in railway crossovers. Materials used nowadays in the railway industry for frogs e.g. Hadfield cast steel (GX120Mn13) or wrougth pearlitic steel (eg. R260) do not fulfil all exploitation requirements indicated in the UIC (International Union of Railways) Decision No. 1692/96 in terms of train speed that should be reached on railways. One of the possible solution is using a cast steel with bainitic or bainitic-martensitic microstructure that allows to gain high strength properties the ultimate tensile strength (UTS) of 1400 MPa, the tensile yield strength (TYS) of 900 MPa and the hardness of up to 400 BHN. The tested material is considered as an alternative to Hadfield cast steel that is currently used for railway frogs. Results of an experimental analysis of the effect of conducted heat treatment on a microstructure, the volume fraction of retained austenite and mechanical properties of bainitic steel, are shown in this paper. It was found that, the heat treatment leads to a stabilization of retained austenite in grain boundaries area of the primary austenite. Additionally, the heat treatment according to the variant #3 results with an almost 3-times higher impact toughness to that exhibited by material subjected to the other treatments.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 4; 2147-2151
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 heat treatment on microstructure and tribological properties of resistance butt welds made of a cast bainitic steel
Wpływ obróbki cieplnej na mikrostrukturę i własności tribologiczne złącza zgrzewanego wykonanego ze staliwa bainitycznego
Autorzy:: Parzych, S.
Krawczyk, J.
Powiązania:: https://bibliotekanauki.pl/articles/354636.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: obróbka cieplna
staliwo bainityczne
krzyżownice kolejowe
spawanie
heat treatment
bainitic cast steel
railway frogs
resistance butt welding
Opis:: This work deals with the influence of heat treatment on microstructure and tribological properties of specimen cast assigned as a material used for frogs in railway crossovers. Materials used nowadays in the railway industry for frogs: Hadfield cast steel (GX120Mn13) and forged pearlitic steel (R260) do not fulfil strict conditions of exploitation and speed that should be reached on railway as indicated in the UIC Decision No. 1692/96. One of the possible solutions is using cast steel with bainitic or bainitic-martensitic microstructure, which allows to gain high strength properties (Rm = 1400 MPa, Rp0,2 = 900 MPa and up to 400 BHN). The test material is an alternative to railway frogs made of Hadfield cast steel. It remains problematic to determine the properties at the weld of the frog with the rail, which can also have bainitic microstructure. To ensure similar wear in both the resistance joint and the base material the resistance butt joint should have almost the same mechanical and tribological properties as the base metal. The main objective of the present work is to study the influence of heat treatment on microstructure and tribological properties of resistance welds made of bainitic cast steel used for frogs in railway crossovers.
Niniejsza praca dotyczy wpływu obróbki cieplnej na mikrostrukturę i własności tribologiczne odlewu próbnego przeznaczonego jako materiałna krzyżownice kolejowe. Dotychczasowe materiały stosowane w kolejnictwie na krzyżownice: staliwo Hadfielda (GX120Mn13) oraz kuta stal perlityczna (R260) nie spełniają rygorystycznych warunków eksploatacji i prędkości osiąganych na nawierzchniach kolejowych zawartych w Decyzji UIC nr 1692/96. Jednym z rozwiązań jest zastosowanie materiałów o mikrostrukturze bainitycznej lub bainityczno-martenzytycznej, co umożliwia uzyskanie wysokich własności wytrzymałościowych (Rm =1400 MPa, Rp0,2 =900 MPa, twardości do 400 HBW). Badany materiałjest alternatywą dla krzyżownic kolejowych ze staliwa Hadfielda. Problematyczne pozostaje określenie również własności w miejscu połączenia krzyżownicy z szyną, która również może mieć mikrostrukturę bainityczną. Wykonane złącze zgrzewane powinno wykazywać jak najbliższe własności (mechaniczne, tribologiczne itp.) do materiału rodzimego gdyż wówczas zapewniają one równomierne zużywanie się zarówno w obszarze złącza jak i samego materiału rodzimego. W pracy określono wpływ obróbki cieplnej na mikrostrukturę i własności tribologiczne zgrzein wykonanych ze staliwa bainitycznego stosowanego na krzyżownice do rozjazdów kolejowych.
Źródło:: Archives of Metallurgy and Materials; 2012, 57, 1; 261-264
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of Austempering Temperature on the Microstructure and Retained Austenite of Cast Bainitic Steel Used for Frogs in Railway Crossovers
Autorzy:: Parzych, S.
Dziurka, R.
Goły, M.
Kulinowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/354616.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: railway crossover
austempering of bainitic cast steel
heat treatment
Opis:: This work deals with the effect of austempering temperature and time on the microstructure and content of retained austenite of a selected cast steel assigned as a material used for frogs in railway crossovers. Bainitic cast steel was austempered at 400°C, 450°C and 500°C for two selected times (0.5 h, 4.0 h) to study the evolution of the microstructure and retained austenite content. The microstructure was characterized by optical microscopy, X-ray diffraction analyses (XRD), and hardness tests. Phase transformations during and after austempering were determined by dilatometric methods.The increase in isothermal temperature causes an increase in time to start of bainitic transformation from 0.25 to 1.5 s. However, another increase in temperature to 500°C shifts the incubation time to as much as 11 s. The time after which the transformations have ended at individual temperatures is similar and equal to about 300 s (6 min.). The dilatation effects are directly related to the amount of bainite formation. Based on these we can conclude that the temperature effect in the case of cast steel is inversely proportional to the amount of bainite formed. The largest effect can be distinguished in the case of the sample austempered at 400°C and the smallest at 500°C. Summarizing the dilatometric results, we can conclude that an increase in austempering temperature causes an increase in austenite stability. In other words, the chemical composition lowers (shifts to lower temperatures) the range of bainite transformation. It is possible that at higher austempering temperatures we will receive only stable austenite without any transformation. This is indicated by the hatched area in Figure 4b. This means that the heat treatment of cast steel into bainite is limited on both sides by martensitic transformation and the range of stable austenite. The paper attempts to estimate the content of retained austenite with X-ray diffraction.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 4; 1463-1468
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Evaluation of the Wear Mechanism of High-Carbon Hardfacing Layers
Autorzy:: Winczek, J.
Gucwa, M.
Mičian, M.
Koňár, R.
Parzych, S.
Powiązania:: https://bibliotekanauki.pl/articles/354160.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: hardfacing
self shielded flux cored arc welding
cast iron
erosion
wear
structure
Opis:: Materials based on cast irons are often used for protection against wear. One of the methods of creating protective surface with cast iron structures is hardfacing. The application of hardfacing with self shielded flux cored wire with high carbon content is one of the economical ways often used to protect machinery parts exposed to both abrasion and erosion. The wear resistance of hardfacings depends on their chemical composition, structure obtained after hardfacing, parameters of depositing process andspecific conditions of wear. As the base material in the investigation the steel grade S235JR was used. The wear behavior mechanism of hardfacings made with one type of self shielded flux cored wire and different process parameters were evaluated in thispaper. Structures obtained in deposition process were different in hardness, amount of carbides and resistance to wear with two investigated impingement angles. The erosion tests showed that impingement angle 30° gives lower erosion rate than angle 60°.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 3; 1111-1115
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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