Wyniki wyszukiwania - BazTech

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Wpływ temperatury na pracę łamania (udarnosć) ferrytycznego żeliwa sferoidalnego

Dudyk M., Krzywoń B., Płonka S., Raszka T.

Archives of Mechanical Technology and Automation

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2012

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Vol. 32, no. 3

85--92

PL

W artykule przedstawiono wyniki badań ferrytycznego żeliwa sferoidalnego EN-GJS-400-15 według normy PN-EN 1563:2000, otrzymanego w warunkach przemysłowych. Odpowiednio przygotowane procesy fizykochemiczne pozwoliły na uzyskanie właściwej struktury i właściwości mechanicznych odlewów motoryzacyjnych, spełniających wymagania odbiorców krajowych i zagranicznych. W szerokim zakresie zbadano wpływ niskiej temperatury (od 60 °C do 20 °C) na pracę łamania i udarność próbek bez karbu, z karbem U i z karbem V. Na podstawie analizy otrzymanych wyników pracy łamania i udarności oraz aproksymacji metodą najmniejszych kwadratów wykazano, że obniżenie temperatury badanych próbek poniżej 0°C bardzo znacząco zmniejsza plastyczność ferrytycznego żeliwa sferoidalnego.

2

Effect of temperature on work-of-fracture (impact strength) of ferritic ductile iron

Dudyk M., Krzywoń R., Płonka S., Raszka T.

Archives of Mechanical Technology and Automation

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2012

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Vol. 32, no. 3

15--23

EN

The paper presents test results of ferritic ductile iron EN-GJS-400-15 Grade (according to PN¬EN 1563:2000 standard) manufactured within industrial environment. Properly prepared and performed physical-chemical processes enabled to obtain suitable structure and mechanical properties of castings to automotive applications, fulfilling requirements of domestic and foreign customers. There were performed in wide range tests of effect of low temperatures (from -60 °C to 20 °C) on work-of-fracture and impact strength of specimens without notch, with U-notch, and specimens with F-notch. On base of performed analysis of obtained work-of-fracture results and impact strength as well as performed the least-squares approximation, it has been demonstrated that decrease of temperature of the specimens below 0 °C reduces significantly plasticity of ferritic ductile iron.

3

Optimisation the magnetic properties of the (Fe1-xCox)73.5Cu1Nb3Si13.5B9(X=10;30;40) alloys

Szwieczek D., Raszka T., Olszewski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 20, nr 1-2

31-36

EN

Purpose: In this paper results of experience of influence a structure (amorphous and amorphous after structural relaxation) on the magnetic properties (the initial magnetic permeability mu p, the magnetic permeability mu in function magnetic field H, the coercive field Hc, the remanence Br and the saturation induction Bs) on (Fe1-xCox)73.5Cu1Nb3Si13.5B9(X=10;30;40) alloys have been presented. Design/methodology/approach: The material was obtained by the method of rapid cooling from liquid phase. The measurements of structure were made on the magnetic balance, the X-ray diffraction and the moessbauer measurements. The measurements of the magnetic properties were made on the Maxwell-Wien bridge, the fluxometr and the VSM - Vibrating Sample Magnetometer. Findings: The results allowed defining that are significant dependence between the magnetic properties and the structure of the material. Research limitations/implications: Due to the high influence of the cobalt on the magnetic properties of the material further research should be undertaken. Practical implications: The measurements of allows give information to the industry how affect on the magnetic properties of alloys by adequate the heat treatment. Originality/value: The Finemet is very attractive due to his excellent the soft magnetic properties. The problem of his application in higher temperature of application and improvement his magnetic properties have been presented.

4

Structure and magnetic properties of Fe63.5Co10Cu1Nb3Si13.5B9 alloy

Szewieczek D., Raszka T.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

179--182

EN

Purpose: In this paper results of experience of influence a structure (amorphous, amorphous after structural relaxation and nanocrystal) and influence a corrosion medium, which was 1 M solution NaCl, on magnetic properties (initial magnetic permeability μp, relative magnetic permeability μw, coercive field Hc, remanence Br and saturation magnetisation Bs) on Fe63.5Co10Cu1Nb3Si13.5B9 alloy have been presented. Design/methodology/approach: The material was obtained by the method of rapid cooling from liquid phase. The measurements of structure were made on the magnetic balance, the X-ray diffraction. The measurements of magnetic properties were made on the Maxwell-Wien bridge, the fluxometr and the VSM – Vibrating Sample Magnetometer. Findings: The results allowed defining that are significant dependence between the magnetic properties, the structure of the material and the corrosion. Research limitations/implications: Due to the high influence of the corrosion on the magnetic properties of the material further research should be undertaken. Practical implications: The measurements allow giving information to the industry how decrease the magnetic properties of alloy after influence the corrosion medium. Originality/value: The Finemet is very attractive due to his excellent soft magnetic properties. The problem of the corrosion has been presented and her influence on the magnetic properties.

5

Soft magnetic composite based on nanocrystalline Fe73.5Cu1Nb3Si13.5B9 and Fe powders

Gramatyka P., Nowosielski R., Sakiewicz P., Raszka T.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 15, nr 1-2

27--31

EN

Purpose: The main aim of this study is the producing of toroidal shape soft magnetic composite cores from nanocrystalline Fe73,5Si13,5Nb3Cu1B9 and Fe powders insulated with epoxy resin and to investigate the density and content of powder response of the soft magnetic properties. Design/methodology/approach: Examination of magnetic properties of SMC was made on the Ferrometr device. The magnetic parameters were determined from hysteresis loops, permeability as a function of applied magnetic field and core losses as a function of magnetic induction characteristics. Findings: The results of experimental studies demonstrated a correlation between the increase density and the improvement of the magnetic properties of the composite. Research limitations/implications: The measurements of magnetic permeability should be conducted in a wide range of frequency. Practical implications: The usability of composite cores as inductive component in electronic industry depends upon further investigations. Originality/value: Soft magnetic composites based on iron powders are essential elements in today’s electronic world. As far as we know, composites materials based on nanocrystalline material as soft magnetic materials have not been examined yet.

6

Influence of Na2SO4 on magnetic properties of (Fe1-XCoX)73.5Cu1Nb3Si13.5B9 (X=10, 40) alloys

Szewieczek D., Raszka T.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

161--164

EN

Purpose: In this paper magnetic properties of new (Fe1-XCoX)73.5Cu1Nb3Si13.5B9 (X=10, 40) alloys have been presented. Moreover comparison of the changes of their magnetic properties due to influence of corrosion medium Na2SO4 has been done. Design/methodology/approach: The material was obtained by the method of rapid cooling from liquid phase. The measurements of magnetic properties were made on the Maxwell-Wien bridge, the fluxometr and the VSM – Vibrating Sample Magnetometer. Findings: The results allowed defining that are significant dependence between the magnetic properties and the corrosion. Research limitations/implications: Due to the high influence the corrosion on the magnetic properties of the material further research should be undertaken. Practical implications: The measurements allow giving information to the industry how decrease the magnetic properties of alloy after influence the corrosion medium. Originality/value: The Finemet is very attractive due to his excellent soft magnetic properties. The problem of the corrosion has been presented and her influence on the magnetic properties.