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Mechanical properties of two manganese steels

Cagala M., Mazancová E., Lichý P., Beňo J., Břuska M., Špirutová N.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 1

9-12

EN

The article is focused on thermomechanical and plastic properties of two high-manganese TRIPLEX type steels with an internal marking 1043 and 1045. Tensile tests at ambient temperature and at a temperature interval 600 C to 1100 C were performed for these heats with a different chemical composition. After the samples having been ruptured, ductility was observed which was expressed by reduction of material after the tensile test. Then the stacking fault energy was calculated and dilatation of both high-manganese steels was measured. At ambient temperature (20 C), 1043 heat featured higher tensile strength by 66MPa than 1045 heat. Microhardness was higher by 8HV0,2 for 1045 steel than for 1043 steel (203HV0,2). At 20 C, ductility only differed by 3% for the both heats. Decrease of tensile properties occurred at higher temperatures of 600 up to 1100 C. This tensile properties decrease at high temperatures is evident for most of metals. The strength level difference of the both heats in the temperature range 20 C up to 1100 C corresponded to 83 MPa, while between 600 C and 1100 C the difference was only 18 MPa. In the temperature range 600 C to 800 C, a decrease in ductility values down to 14 % (1045 heat), or 22 % (1043 heat), was noticed. This decrease was accompanied with occurrence of complex Aluminium oxides in a superposition with detected AlN particles. Further ductility decrease was only noted for 1043 heat where higher occurrence of shrinkage porosity was observed which might have contributed to a slight decrease in reduction of area values in the temperature range 900 C to 1100 C, in contrast to 1045 heat matrix.

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Analysis of fracture mechanism in austenitic ductile iron with 30% Ni after impact test

Putyra P., Tabor A., Zarębski K.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 4

193-198

EN

The study presents the results of impact tests carried out on austenitic ductile iron with 30% Ni. The examined material was subjected to dynamic loads within a wide range of temperatures from (-196°C) to (+400°C). The fractures were examined under a JEOL JSM 6460LV scanning electron microscope. Additionally, microstructural examinations were carried out and chemical analysis in microregions was done by EDS.

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Wpływ niklu na właściwości wytrzymałościowe austenitycznego żeliwa sferoidalnego

Putyra P., Zarębski K., Tabor A.

Archiwum Odlewnictwa

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2006

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R. 6, nr 18/2

71--76

PL

W pracy przedstawiono wyniki badań właściwości mechanicznych dwóch rodzajów austenitycznego żeliwa sferoidalnego o różnej zawartości niklu (17% i 23%). Badania prowadzone w szerokim zakresie temperatury (od –196ºC do 650°C) miały na celu wyznaczenie dla analizowanych wytopów: wytrzymałości na rozciąganie (Rm), umownej granicy plastyczności (Rp0,2), wydłużenia (A5), przewężenia (Z) oraz udarności (KCV). W artykule zamieszczono również wyniki z pomiarów twardości (HRB) oraz zdjęcia mikrostruktur poszczególnych wytopów.

EN

This work presents results of the tensile properties of the austenitic nodular cast iron with different nickel content (17% i 23%). The investigation were carried out in extensive range of temperature (from-196°C to 650°C) and lead to determination of: tensile strength; proof strength; elongation; reduction of area and impact strength for examined iron cast. Furthermore in this paper were placed results from hardness mensuration and pictures presenting structure of each cast.