Wyniki wyszukiwania - BazTech

1

Microstructure and mechanical properties of steels for shaped charge liners and preliminary assessment of the effectiveness of experimental shaped charges intended for use in the mining industry

Marcisz Jarosław, Żak Artur, Stępień Jerzy, Burdek Marek, Tomczak Tymoteusz, Burian Wojciech, Janiszewski Jacek, Pytlik Mateusz

Journal of Metallic Materials

|

2021

|

Vol. 73, no. 2

2--12

EN

The paper presents the results of investigation of the microstructure and mechanical properties of Fe-based materials designed for the manufacture of semi-spherical liners for experimental shaped charges. The tests were carried out on material samples taken from two semi-finished products, i.e. a rod for the manufacture of charge liners with a diameter of 50 mm using machining, and sheets for the manufacture of liners with a diameter of 100 mm using cold drawing. Microstructure examination was also carried out on a test specimen obtained using the additive method (3D-WAAM), made of low-carbon unalloyed steel wire. Firing tests on concrete blocks were carried out in order to quantify the effects of drilling at the Experimental Mine Barbara. The scope of the tests consisted of firing at cylindrical concrete blocks using projectiles containing 50 mm diameter liners made of Fe-based alloys. Based on the results of the laboratory material, two experimental steel grades were selected for further testing. Plates made of the selected steels will be used to manufacture charge liners with a diameter of 100 mm.

PL

Przedstawiono wyniki badań mikrostruktury i właściwości mechanicznych materiałów na bazie Fe przeznaczonych do wytwarzania wkładek półsferycznych do eksperymentalnych ładunków kumulacyjnych. Badaniom poddano próbki materiałowe pobrane z dwóch półfabrykatów, tj. pręta do wytwarzania wkładek kumulacyjnych o średnicy 50 mm metodą obróbki skrawaniem oraz blach do wytwarzania wkładek o średnicy 100 mm metodą tłoczenia na zimno. Przeprowadzono badania mikrostruktury próbki testowej wykonanej metodą przyrostową (3D-WAAM) z drutu ze stali niskowęglowej niestopowej. Próby strzelania do bloków betonowych w celu ilościowego oszacowania skutków drążenia otworów przeprowadzono w Kopalni Doświadczalnej Barbara. Zakres badań obejmował strzelanie do walcowych bloków betonowych z wykorzystaniem pocisków zawierających wkładki o średnicy 50 mm wykonane ze stopów na bazie Fe. Na podstawie wyników badań materiału laboratoryjnego wytypowano do dalszych badań dwa eksperymentalne gatunki stali. Blachy z dobranych stali będą wykorzystane do wytwarzania wkładek kumulacyjnych o średnicy 100 mm.

2

Development of Magnetic After-Effect Setup and Application in the Study of Relaxation Processes in Fe-C, Fe-Cu and Fe-Cr Alloys

Minov B., Konstantinovic M.J., Dupre L.

Przegląd Elektrotechniczny

|

2011

|

R. 87, nr 9b

120-123

EN

A magnetic after-effect setup, based on an open magnetic circuit, is developed and presented. The magnetic after-effect experiment aims to determine the time and temperature dependence of the initial susceptibility, which is obtained by an AC measurement of the mutual inductance. After sample demagnetization, the change of the time dependent initial susceptibility is measured for particular ferromagnetic materials at a chosen temperature. The setup is applied for the investigation of relaxation processes of dislocations and carbon atoms in Fe-C, Fe-Cu and Fe-Cr alloys.

PL

Przedstawiono układ do badania lepkości magnetycznej w obwodach otwartych. Badano początkową susceptancję jako funkcję temperatury i czasu. Analizowano procesy relaksacyjne w stopach Fe-C, Fe-Cu i Fe-Cr.

3

Thermal stability and GFA parameters of Fe-Co-based bulk metallic glasses

Nowosielski R., Januszka A.

Journal of Achievements in Materials and Manufacturing Engineering

|

2011

|

Vol. 48, nr 2

161--168

EN

Purpose: The paper present fabrication process, structure characterization and selected thermal properties of Fe-Co-based bulk metallic glasses in form of rods. Additionally selected GFA parameters were determined. Design/methodology/approach: The studies were realized on Fe36Co36B19.2Si4.8Nb4 metallic glasses in form of rods with diameter of 0=1.5, ø=2 and ø=3 mm. Samples were performed by the pressure die casting method. An amorphous structure was confirmed by the X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. The thermal properties of the studied samples were examined by differential scanning calorimetry (DSC). GFA parameters were calculated based on thermal properties. Findings: The X-ray analysis and scanning microscopy observation revealed that the studies as-cast rods were amorphous. For each sample broad diffraction halo could be observed. That diffraction pattern confirm formation of glassy phase in studied samples. Practical implications: Fe-Co-based bulk metallic glasses could be used in many practical application. For the sake of great mechanical, thermal and magnetic properties they may be used as a structural material and in many electric and magnetic applications (for example soft electro-magnetic cores). Knowledge about thermal properties could be useful in computer simulation of metallic glasses casting process. Originality/value: The obtained examination results allow to confirm the utility of investigation methods, which has used in this work. Thermal analysis allow to determinate selected GFA parameters for selected Fe-Co-based alloy.

4

Modeling of the thermodynamic properties of liquid Fe-Ni and Fe-Co alloys from the surface tension data

Gąsior W., Fima P., Moser Z.

Archives of Metallurgy and Materials

|

2011

|

Vol. 56, iss. 1

13-23

EN

Recently proposed method of modeling of thermodynamic properties of liquid binary alloys from their surface tension data is described. The method utilizes Melford and Hoar equation, relating surface tension with excess Gibbs free energy, combined with new description of the monatomic surface layer and Β parameter. The method is tested on Fe-Ni and Fe-Co alloys and the obtained results show very good agreement with experimental thermodynamic data of other authors. The model allows also to calculate the surface tension from thermodynamic data, and it gives better agreement with experimental results than those modeled with the use of Butler equation and traditionally defined monatomic surface layer and Β = 0.83.

PL

W pracy opisana jest niedawno zaproponowana metoda modelowania właściwości termodynamicznych ciekłych stopów dwuskładnikowych z ich danych napięcia powierzchniowego. Metoda wykorzystuje równanie Melforda i Hoara, wiążące napięcia powierzchniowe z nadmiarową energią swobodną Gibbsa, w połączeniu z nowym opisem monoatomowej warstwy powierzchniowej i parametru Β. Metoda została przetestowana na stopach Fe-Ni i Fe-Co, a uzyskane wyniki pokazują bardzo dobrą zgodność z eksperymentalnymi danymi termodynamicznymi innych autorów. Model ten pozwala również na obliczanie napięcia powierzchniowego z danych termodynamicznych i daje lepszą zgodność z wynikami eksperymentalnymi niż modelowanie przy użyciu równania Butlera i tradycyjnie definiowanej monoatomowej warstwy powierzchniowej oraz Β = 0.83.

5

The influence of yttrium addition on the GFA of selected iron-based BMG

Pilarczyk W., Mucha A.

Archives of Materials Science and Engineering

|

2010

|

Vol. 44, nr 2

87-95

EN

Purpose: The main aims of this work is the presentation of the influence of yttrium addition on the structure and properties of BMG and the production attempt of chosen Fe-based bulk metallic alloys. Design/methodology/approach: The studies were carried out on Fe- based alloys ingots with the following compositions Fe43Co7Cr15Mo14C15B6, Fe41Co7Cr15Mo14C15B6Y2 and Fe39Co7Cr15Mo14C15B6Y4. Samples were prepared by induction melting of the pure Fe, Co, Cr, Mo, C, B and Y elements in argon atmosphere. The structure was tested with X-ray diffraction. In order to investigate the structure scanning electron microscopy was used. The thermal properties of the alloys were examined by DTA and DSC methods. Findings: Bulk metallic glasses with yttrium addition exhibit high glass forming ability. These materials depending on accurate chemical composition present excellent corrosion resistance, magnetic, electric and mechanical properties. Fe-based materials with yttrium addition are potential materials for industrial applications. Research limitations/implications: It is very difficult to obtain a metallic glass of Fe43Co7Cr15Mo14C15B6, Fe41Co7Cr15Mo14C15B6Y2 and Fe39Co7Cr15Mo14C15B6Y4 alloys. All tested alloys have crystalline structure. Taking into account all the factors affecting the test samples, we can conclude that the received samples have not an amorphous structure for the non-uniform distribution of yttrium in materials. Originality/value: Overall presentation of the yttrium addition influence, the formation and the study of Fe-Co-Cr-Mo-C-B-Y bulk metallic materials.

6

A production attempt of selected metallic glasses with Fe and Ni matrix

Pilarczyk W., Nowosielski R., Babilas R.

Archives of Materials Science and Engineering

|

2010

|

Vol. 41, nr 1

5-12

EN

Purpose: This paper tends to present the microstructure characterization and thermal analysis of the Fe- and Ni-based bulk metallic materials. Design/methodology/approach: The studies were carried out on bulk metallic materials as rods. The rods of the Fe57.6Co7.2Ni7.2B19.2Si4.8Nb4 and Ni64.8Co7.2B19.2Si4.8Nb4 alloys were obtained by the pressure die casting. In order to investigate the structure scanning electron microscopy were used. Phase composition of obtained rods was determined by means of diffractometer. The thermal properties of the studied alloys were examined by differential thermal analysis and differential scanning calorimetry. Findings: The x-ray analysis, microscopic observation and thermal examination revealed that the studied as-cast bulk metallic materials were of amorphous, crystalline and mixed structure. Broad diffraction halo can be seen for rods with diameter of ø=1.5 and 2mm of Fe57.6Co7.2Ni7.2B19.2Si4.8Nb4 alloy. The replacement of Fe by Ni created crystalline structure. Practical implications: Fe- and Ni-based bulk metallic glass systems have been developed because they offer great potential for commercial application. Fe-based ferromagnetic bulk glassy alloys exhibit great magnetic properties. It is very important for their magnetic applications. That alloys can be used as soft electro-magnetic cores for choke coil or noise filter. Ni-based bulk metallic glasses exhibit excellent mechanical properties and corrosion resistance. Originality/value: The formation and studies of the casted Fe- and Ni-based bulk materials and investigation of the effectiveness of the replacement of Fe by Ni.

7

Structure and soft magnetic properties of Fe72B20Si4Nb4 bulk metallic glasses

Nowosielski R., Babilas R., Griner S., Stokłosa Z.

Archives of Materials Science and Engineering

|

2009

|

Vol. 35, nr 1

13-20

EN

Purpose: The paper presents a microstructure characterization, thermal stability and soft magnetic properties analysis of Fe-based bulk amorphous materials. Design/methodology/approach: The studies were performed on Fe₇ ₂B₂ ₀Si₄Nb₄ glassy alloy in form of ribbons and rods. The amorphous structure of tested samples was examined by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) methods. The thermal properties of the glassy samples were measured using differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The magnetic properties were determined by the Maxwell-Wien bridge and VSM methods. Findings: The X-ray diffraction and transmission electron microscopy investigations have revealed that the studied as-cast bulk metallic glasses were amorphous. Broad diffraction halo can be seen for all tested samples, indicating the formation of a glassy phase with the diameters up to 2 mm. The fracture surface of rod samples appears to consist of small fracture zones, which leads to breaking of the samples into parts. A two stage crystallization process was observed for studied amorphous alloy. The changes of crystallization temperatures and magnetic properties as a function of glassy samples thickness were stated. Practical implications: The studied Fe-based alloy system has good glass-forming ability and thermal stability for casting bulk metallic glasses, which exhibit good soft magnetic properties, useful for many electric and magnetic applications. Originality/value: The obtained examination results confirm the utility of applied investigation methods in the microstructure, thermal and soft magnetic properties analysis of examined bulk amorphous alloys.