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1

Badanie rozrostu ziaren mikrostruktury stali sprężynowej 61SiCr7

Królicka A.

Interdisciplinary Journal of Engineering Sciences

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2018

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Vol. 6, no. 1

44--47

PL

W artykule przedstawiono wyniki badań z określania rozmiaru ziarna mikrostruktury stali sprężynowej 61SiCr7 (60C2A). Materiał ten wytypowano ze względu na możliwość uzyskania nanostrukturalnego, bezwęglikowego bainitu. Przy wyborze uwzględniono wpływ rozmiaru ziarna na czas przemiany bainitycznej, mikrostrukturę, oraz właściwości mechaniczne tego typu materiałów. Badania wykazały, że dodatek krzemu spowodował trudności w ujawnieniu granic ziaren byłego austenitu. Wyznaczono optymalne parametry obróbki cieplnej, która umożliwiła uzyskanie mikrostruktury do określenia rozmiaru ziarna badanej stali. Przeprowadzono analizę rozrostu ziarna badanej stali w pięciu różnych temperaturach austenityzacji.

EN

The article presents results from determination of a grain size in microstructure of the 61SiCr7 (60C2A) spring steel. The material was selected with respect to the possibility of obtaining a nano-structured bainite without carbide precipitates. This was conducted basing on an influence of grain size on bainitic transformation time, microstructure and mechanical properties of the material type considered. The experiments indicated, that the addition of silicon caused difficulties related to revealing the grain boundaries of the austenite. Optimal parameters of heat treatment, which enable to reach the microstructure for observing grain sizes of the steel are shown. The growing grains of the tested steel was followed at five values of austenitizing temperature.

2

Modeling of the formation of AlN precipitates during solidification of steel

Kalisz D., Rzadkosz S.

Archives of Foundry Engineering

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2013

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Vol. 13, iss. 1

63--68

EN

The study was carried out computer simulations of the formation process of AlN precipitates in the solidification of steel. The chemical composition of steel and non-metallic inclusions formed was determined using the commercial software FactSage. Calculated amount of precipitates formed during cooling of steel between the liquidus and solidus temperatures under conditions of thermodynamic equilibrium. In parallel, the computations were performed using your own computer program. It was found that aluminum nitride is formed at the final stage of solidification, and the condition of its formation is low oxygen content in steel.

3

Efekty magnetosprężyste w stalach krzemowych

Żurek Z.H., Szudyga M.

Maszyny Elektryczne : zeszyty problemowe

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2011

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Nr 2(90)

41-43

EN

While designing electric devices it is usually assumed that material's magnetic parameters are constant or influenced by temperature only. In real life, ferromagnetic material properties depend largely on mechanical stresses. In the paper it is shown that material's, largely depends on mechanical stresses.

4

The kinetics of zinc coating growth on hyper-sandelin steels and ductile cast iron

Kopyciński D., Guzik E.

Archives of Foundry Engineering

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2007

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Vol. 7, iss. 4

105-110

EN

The studies aimed at an analysis of the formation and growth kinetics of zinc coating on reactive silicon-killed steels in a zinc bath. The growth kinetics of the produced zinc coatings was evaluated basing on the power-law growth equation. As regards galvanizing of the surface of products, investigation was done for various steel grades and ductile iron taking into account the quality and thickness of coating. It has been proved that the chemical constitution of basis significantly influences the kinetics of growth of the individual phases in a zinc coating. This relationship was evaluated basing on the, so called, silicon and phosphorus equivalent E = (Si+2.5P).10^3, and coating thickness dependences were obtained.

5

Decomposition of austenite formed at the temperature range of A3-A1 in A 0.2C-1.5Mn-1.5Si steel during isothermal annealing at 350-420 degrees centigrade.

Pietrzyk J., Osuch W., Kruk A., Michta G.

Inżynieria Materiałowa

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1998

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R. XIX, nr 3

307-314

EN

The present study has been undertaken in order to examine the kinetics of the isothermal transformation of the austenitic region at temperature range of 350-420 degrees centigrade in low carbon silicon manganese steel after annealing in two-phase region (A1-A2). Carefully designed control-cooling and isothermal bainite transformation allows to obtain a multiphase steel containing retained austenite (8-12%) susceptible to transformation - induced plasticity (TRIP effect). Mechanical properties and microstructural studies of steel after various stages of isothermal transformation were performed.