Wyniki wyszukiwania - Biblioteka Nauki

1

Chosen properties of the crni steel-ti matearial sandvich used in the chemical industry

100%

Mazancová E. , Ostroushko D.

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tom z. 97

21-22

EN

Surface coatings protection is one to the most important processes ensuring efficient and economic use of given materials. Coatings are applied on original material surface and they have usually different chemical composition and structure than the basic material. Numerous methods of coating applications comprise also explosive bonding [1, 2]. Explosive bonding belongs to the group of pressure welding. Application of coatings on materials by explosion lately became a frequently used method since it brings many advantages. One of them is achievement of high strength, resistance to abrasion and corrosion, or toughness in the applied surface layer of material, while at the same time the whole product need not be made from this material. Use of this method significantly reduces costs of material and makes it possible to bond together of material types, which can be otherwise joined with great difficulties, or which cannot be bonded together at all (e.g. Ti - steel and others) [1-4]. Almost all metals can be bonded by explosive bonding. In our case two anticorrosive materials (steel CrNi18/10 and Ti) are used. The final product made with our study materials will be applied in the chemical industry and in the environment with two different corrosive mediums. The experimental works were focused on investigation of micro-structure and mechanical properties after explosion bonding and after followed heat treatment (HT). Investigation of micro-structure using methods of the light microscopy was completed with micro-hardness tests. The (HT) had the following course: Annealing temperature at 600 0C. Dwell was 1.5 h at the isothermal temperature with subsequent cooling on the air. By explosion samples of material related in primary state were marked S-IS and after the HT as S-HT.

2

Phase Analysis of Explosive Welded Ti-Cr/Ni Steel in As-Received State and after Heat Treatment Using Synchrotron/ Analiza Fazowa Połączenia Ti-Cr/Stali Ni Wytworzonego Metodą Zgrzewania Wybuchowego W Stanie Wyjściowym Oraz Po Obróbce Termicznej Z Wykorzystaniem Promieniowania Synchrotonowego

80%

Ostroushko D. , Mazancová E. , Saksl K. , Milković O.

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nr 4

3

Phase Analysis of Explosive Welded Ti-Cr/Ni Steel in As-Received State and after Heat Treatment Using Synchrotron

80%

Ostroushko D. , Mazancová E. , Saksl K. , Milković O.

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tom Vol. 59, iss. 4

1611--1614

EN

Surface coatings protection is one of the most important processes ensuring efficient and economic use of basic materials, mostly of lower-quality. At interface of clad and basic material intermetallic phases are formed, representing quite different matrix with dissimilar properties unlike the welded materials. One type of surface coating is explosive bonding which belongs to group of pressure welding. The work is focused on interface shape line, inhomogeneities in vicinity of the wave joint both in basic material and in vicinity of weld line of the Ti and Cr/Ni stainless steel (SS) matrix. Investigated weld was both in as-received state and after heat treatment carried out at 600°C/90 minutes/air. Presented phases have been identified using X-ray diffraction performed by synchrotron. The Tiα, Fe-fcc, Fe-bcc and intermetallic phases Fe2Ti were detected at interface area.

PL

Jednym z najważniejszych procesów zapewniających skuteczne i ekonomiczne uwarunkowane stosowanie materiałów konstrukcyjnych jest pokrywanie powierzchni warstwą ochronną. W strefie połączenia następuje formowanie się faz międzymetalicznych charakteryzujących się całkowicie odmiennymi od materiałów łączonych własnościami. Jednym ze sposobów pokrycia powierzchni materiałów jest zgrzewanie wybuchowe, które należy do metod ciśnieniowych. Praca została zogniskowana na charakterystyce kształtu linii połaczenia, niejednorodnościach w okolicy rozchodzenia się fali wybuchu obydwu materiałów, jak i w okolicach linii samego połączenia Ti oraz Cr/Ni stali niskowęglowej (SS). Badania fazy przetopionej w obydwu materiałach prowadzono po przeprowadzeniu obróbki termicznej, która przeprowadzono w temperaturze 600°C przez 90 minut, bez atmosfery ochronnej. Pojawiające się fazy zostały przebadane z wykorzystaniem dyfrakcji promieni rentgenowskich w synchrotronie. Ujawniono fazy Tiα, Fe-fcc, Fe-bcc oraz fazę międzymetaliczną Fe2Ti w obszarze połączenia.

4

SEM analysis of sandwich materials after explosive cladding

70%

Čížek L. , Ostroushko D. , Szulc Z. , Prażmowski M. , Wachowski M.

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tom z. 95

13-13

5

Structure and Mechanical Properties of Explosive Welded Mg/Al Bimetal/ Struktura I Właściwości Mechaniczne Połączenia Uzyskanego Metodą Zgrzewania Wybuchowego Bimetalu Mg/Al

70%

Balga D. , Ostroushko D. , Saksl K. , Mazancová E. , Milković O.

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6

Structure and Mechanical Properties of Explosive Welded Mg/Al Bimetal

70%

Balga D. , Ostroushko D. , Saksl K. , Mazancová E. , Milković O.

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tom Vol. 59, iss. 4

1593--1597

EN

In the article we analyzed shape, local mechanical properties, chemical and phase composition of Magnesium/Aluminium cladded material prepared by explosion welding. In particular we focus our investigation on Mg/Al interface and areas close to the joint. Hardness of the joined materials measured far from their interface is similar for both materials, however in the region of interface the hardness drops down by 40%. Phase transformations in the interface was examined by a hard X-ray micro-diffraction experiment performed at beamline P07 at PETRA III at the energy of 99 keV which helped us identify in Al: fcc-Al, Al2 Cu tetragonal and Al7 Cu2 Fe tetragonal and in Mg: hcp-Mg, Mg2 Si cubic phases. In the interface we haven’t observed any new intermetallics, but computation of lattice parameters and profiles of Al and Mg peaks proved an existence of solid solution with different gradient of chemical composition.

PL

W pracy analizowano kształt, lokalne właściwości mechaniczne, chemiczne oraz składników fazowych Mg/Al materiałów platerowanych otrzymanych metodą zgrzewania wybuchowego. W szczególności, skupiono się na badaniach połączenia fazy Mg/Al oraz obszarów znajdujących się w pobliżu połączenia. Twardość połączonych materiałów badano w znacznej odległości od warstwy samego połączenia, i zauważono, iż jest ona podobna do twardości materiałów wyjściowych, jednakże twardość w regionie warstwy połączenia spada o 40%. Przemiana fazowa w warstwie połączenia została poddana badaniom mikrodyfrakcyjnym, na urządzeniu P07, PETRA III o energii 99 keV, dzięki której zidentyfikowano w Al fazy tetragonalne: fcc-Al, Al2 Cu oraz Al7 Cu2 Fe i w Mg: heksagonalna Mg oraz kubiczna Mg2 Si. W warstwie połączenia nie zaobserwowano żadnych innych nowych faz międzymetalicznych. Obliczone parametry sieci komórki elementarnej i profile pików Al i Mg potwierdzają występowanie roztworu stałego z różnym gardientem składu chemicznego.

7

Properties of sandwich metals joined by explosive cladding method

70%

Čížek L. , Ostroushko D. , Szulc Z. , Molak R. , Praźmowski M.

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2010

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tom Vol. 43, nr 1

21-29

EN

Purpose: Paper presents results of investigations with two layers explosively formed sandwich composite consisting of different composition joint which requires very often knowledge of structure and mechanical properties. These properties are connected with microstructure that is influenced by technological factors under cladding. Design/methodology/approach: The sample bars were prepared from explosively formed sandwich composite near the join area. The methods of the light microscopy and the hardness and tensile test for evaluation of quality of joined sandwich metals were used. Investigations by a new fatigue method in the case sandwich composite steel CrNi(18/10) + Ti were completed. Findings: Measurement of micro-hardness in the zone of the joint a deformation of materials shows an increase value of that. Detailed metallographic observation detected in proximity of the joints an occurrence of structural non-homogeneities. Steel and titanium interface surfaces are corrugated. New fatigue method in the case sandwich composite steel CrNi(18/10) + Ti were verified. Research limitations/implications: Knowledge of microstructure characteristics will be extended by the method of SEM, including micro-analysis of individual structural components and surface analysis. Influence of experiment conditions on results of fatigue test must be more elaborated in future. Practical implications: The results may be utilized for a relation between structure and properties of the investigated materials in process of manufacturing. Originality/value: These results contribute to complex evaluation of properties explosively formed sandwich composite namely for explanation of structure developed new sandwich composites. The results of this paper are determined for research workers deal by development new exploitations of new sandwich composites.