Search results for: T. Tokarski

Items from 1 to 20 out of 154 results

article

The Effect of Rare Earth Addition on Microstructure and Mechanical Properties of the Rapidly Solidified Al-Si and Al-Si-Ni Alloys

D. Kapinos, M. Szymanek, B. Augustyn, S. Boczkal, more

Archives of Metallurgy and Materials > 2020 > Vol. 65, iss. 1 > 185--192

The article presents research aimed at determining the effect of adding rare earth elements to near-eutectic Al-Si and Al-Si-Ni alloys on the microstructure and mechanical properties of the obtained products. Material for the research was prepared using a melt spinner - a device used for rapid crystallization, casting thin ribbons, which were then subjected in subsequent stages to fragmentation, consolidation...

article

Local composite reinforcements of TiC/FeMn type obtained in situ in steel castings

E. Olejnik, Ł. Szymański, T. Tokarski, B. Opitek, more

Archives of Civil and Mechanical Engineering > 2019 > 19 > 4 > 997-1005

This dissertation concerns the method of obtaining the in situ local composite reinforcements (LCR – Locally Composite Reinforcement) of the TiC–FeMn type in steel castings. The reinforcing phase – titanium carbide (TiC) was obtained by placing the pressed substrates of the synthesis of TiC in the form of compacts into a mold cavity. The basic problem connected with fabricating TiC local composite...

article

Local composite reinforcements of TiC/FeMn type obtained in situ in steel castings

E. Olejnik, L. Szymanski, T. Tokarski, B. Opitek, more

Archives of Civil and Mechanical Engineering > 2019 > Vol. 19, no. 4 > 997--1005

This dissertation concerns the method of obtaining the in situ local composite reinforce- ments (LCR – Locally Composite Reinforcement) of the TiC–FeMn type in steel castings. The reinforcing phase – titanium carbide (TiC) was obtained by placing the pressed substrates of the synthesis of TiC in the form of compacts into a mold cavity. The basic problem connected with fabricating TiC local composite...

article

Determinanty przestrzennego zróżnicowania płac na Ukrainie

T. Tokarski, S. Chugaievska, N. Chugaievska

Wiadomości Statystyczne > 2019 > 64 > 5

article

Martensite stabilisation in single crystalline Ni-Mn-Ga and Ni-Mn-Sn magnetic shape memory alloys

R. Chulist, P. Czaja, T. Tokarski, M. Faryna

Materials Letters > 2018 > 230 > C > 266-269

Martensite stabilization in Ni-Mn-Ga and Ni-Mn-Sn single crystals was induced by mechanical training. The degree of stabilization differs between Ni-Mn-Ga and Ni-Mn-Sn (ΔT = 28 K), what is attributed to a disparity in the twinning stress affecting also transformation morphology. Upon martensitic transformation multiple site nucleation is favoured by a larger twinning stress in Ni-Mn-Sn in contrast...

article

Reactive casting coatings for obtaining in situ composite layers based on Fe alloys

Ł. Szymański, E. Olejnik, T. Tokarski, P. Kurtyka, more

Surface and Coatings Technology > 2018 > 350 > C > 346-358

Casting coatings were prepared on the basis of 2, 5, and 10% aqueous solutions of carboxymethylcellulose (CMC) (as a binder) with additions of powdered substrates of the forming reaction of titanium carbide (TiC). These substrates were in powder form; i.e., graphite (C_gr) and titanium (Ti). These coatings were investigated, and their viscosity, wettability, and gas volume emission were determined...

article

Time to Reimplantation: Waiting Longer Confers No Added Benefit

Arash Aali Rezaie, Karan Goswami, Noam Shohat, Anthony T. Tokarski, more

The Journal of Arthroplasty > 2018 > 33 > 6 > 1850-1854

While the preferred surgical treatment for chronic periprosthetic joint infection (PJI) in North America is a 2-stage exchange arthroplasty, the optimal time between first-stage and reimplantation surgery remains unknown. This study was conceived to examine the association between time to reimplantation and treatment failure.Using an institutional database, we identified PJI cases treated with 2-stage...

article

Superelastic behavior of a metamagnetic Ni–Mn–Sn single crystal

P. Czaja, R. Chulist, T. Tokarski, T. Czeppe, more

Journal of Materials Science > 2018 > 53 > 14 > 10383- 10395

A single-crystalline specimen with the composition of Ni_49.5Mn_38.4Sn_12.2 shows a 4.9% recoverable transformation strain upon compressive loading. The critical compressive stress increases with temperature at the step of 5.6 MPa/K, whereas upon cycling it decreases by 18.1 MPa/cycle. The microstructure of the specimen undergoes considerable refinement upon superplastic training; however, it is only...

article

Thermal range of cementite occurrence in hypereutectoid alloys with controlled C, Cr and Mn content

Ł. Frocisz, J. Krawczyk, T. Kozieł, K. Górecki, more

Inżynieria Materiałowa > 2018 > Vol. 39, nr 1 > 29--33

The hypereutectoid alloys are the commonly used for the tool manufacturing. The high carbon content prevent the high hardenability and presence of the secondary cementite precipitation in microstructure. High hardness of such materials provide the good wear resistance required for tool materials. New hypereutectoid alloys designed for the investigations of secondary cementite precipitations influence...

article

Wpływ zmian PKB na przestrzenne zróżnicowanie bezrobocia na Ukrainie

N. Chugaievska, T. Tokarski

Wiadomości Statystyczne > 2018 > 63 > 3

article

Zróżnicowanie rozwoju ekonomicznego krajów UE na podstawie grawitacyjnego modelu wzrostu

R. Wisla, K. Filipowicz, T. Tokarski

Wiadomości Statystyczne > 2018 > 63 > 7

article

Ekonomiczne determinanty migracji międzywojewódzkich

D. Szczepaniak, T. Tokarski

Wiadomości Statystyczne > 2018 > 63 > 2

article

Study of Investment Casting Technology from Bronze Age. Casting Workshop in Grzybiany (Southwest Poland)

A. Garbacz-Klempka, J. S. Suchy, Z. Kwak, T. Tokarski, more

Archives of Metallurgy and Materials > 2018 > Vol. 63, iss. 2 > 615--624

Investment casting technology that utilizes lost-wax casting is one of the most-important achievements of ancient society. In Lower Silesia, Poland (Grzybiany, Legnica county), a 7-6 BC casting workshop was discovered with numerous artifacts, confirming the existence of the manufacturing process of metal ornaments using ceramic molds. The paper presents the research of molds and casts from the Bronze...

article

Microstructure, Hardness and Wear Resistance of Local TiC-ZrO2/FeCr Reinforcement Fabricated in Situ in Steel Castings

S. Sobula, E. Olejnik, P. Kurtyka, Ł. Szymański, more

Archives of Metallurgy and Materials > 2018 > Vol. 63, iss. 1 > 119--124

Wear resistance of TiC-ZrO₂-Fe locally reinforced steel casting has been investigated. Composites were obtained by introducing to mould cavity compact with TiC reaction substrates, ZrO₂particles and addition of moderator. Casting with local reinforcement – composite zone was obtained. Structure and microstructure of composite zone were investigated with use of X-ray diffraction (XRD) and scanning...

article

Micromechanical behaviour of a two-phase Ti alloy studied using grazing incidence diffraction and a self-consistent model

Y. Zhao, S. Wroński, A. Baczmański, L. Le Joncour, more

Acta Materialia > 2017 > 136 > C > 402-414

The mechanical behaviour of each phase in two-phase titanium Ti-18 was studied at room temperature under a low strain rate tensile test until fracture. Due to its selectivity, the X-ray diffraction method was applied for in-situ tensile test to analyse the behaviour of each phase in the direction perpendicular to the loading force. In addition, the biaxial stress states of the initial sample, as well...

article

The Investigation of Strain-Induced Martensite Reverse Transformation in AISI 304 Austenitic Stainless Steel

G. Cios, T. Tokarski, A. Żywczak, R. Dziurka, more

Metallurgical and Materials Transactions A > 2017 > 48 > 10 > 4999-5008

This paper presents a comprehensive study on the strain-induced martensitic transformation and reversion transformation of the strain-induced martensite in AISI 304 stainless steel using a number of complementary techniques such as dilatometry, calorimetry, magnetometry, and in-situ X-ray diffraction, coupled with high-resolution microstructural transmission Kikuchi diffraction analysis. Tensile deformation...

article

The γ′-Ni3(Al,Ta) phase triggered strengthening of the Ni-Ta-Al-Cr-C coating layer, deposited on austenitic stainless steel

K. Wieczerzak, M. Watroba, W. Bednarczyk, M. Madej, more

Materials Characterization > 2017 > 129 > Complete > 367-377

The aim of this work was to analyse the effect of the γ′-Ni₃(Al,Ta) phase on the strengthening of the Ni-Ta-Al-Cr-C coating layer, deposited on austenitic stainless steel AISI 310. The hardfacing alloy was deposited using the Gas Tungsten Arc Welding process. The specimens were analysed in the as-welded, solution treated and aged states. The investigations involved a wide range of experimental techniques,...

article

Persistent Radicals of Self‐assembled Benzophenone bis‐Urea Macrocycles: Characterization and Application as a Polarizing Agent for Solid‐state DNP MAS Spectroscopy

Baillie A. DeHaven, John T. Tokarski, Arthur A. Korous, Frederic Mentink‐Vigier, more

Chemistry – A European Journal > 23 > 34 > 8315 - 8319

UV‐irradiation of a self‐assembled benzophenone bis‐urea macrocycle generates μm amounts of radicals that persist for weeks under ambient conditions. High‐field EPR and variable‐temperature X‐band EPR studies suggest a resonance stabilized radical pair through H‐abstraction. These endogenous radicals were applied as a polarizing agent for magic angle spinning (MAS) dynamic nuclear polarization (DNP)...

article

Branched needle microstructure in Ni-Mn-Ga 10M martensite: EBSD study

R. Chulist, L. Straka, A. Sozinov, T. Tokarski, more

Acta Materialia > 2017 > 128 > C > 113-119

Interaction of conjugate twin boundaries under applied stress was studied using electron backscatter diffraction in the scanning electron microscope. Compression and unloading resulted in a recoverable strain. EBSD maps and BSE images reveal a branched needle microstructure inside and outside the central triangle domain. Type I twin boundaries are mostly observed inside the central domain while some...

article

The effect of temperature on the evolution of eutectic carbides and M7C3 → M23C6 carbides reaction in the rapidly solidified Fe-Cr-C alloy

K. Wieczerzak, P. Bala, R. Dziurka, T. Tokarski, more

Journal of Alloys and Compounds > 2017 > 698 > C > 673-684

This paper presents the effect of high temperature heat treatment on the evolution of eutectic carbides and on the M₇C₃ → M₂₃C₆ carbides reaction in the rapidly solidified hypoeutectic Fe-Cr-C alloy. The investigated alloy was designed using the CALPHAD approach via ThermoCalc in order to obtain a high volume fraction of eutectic carbides with high thermodynamic stability and matrix, where BCC to...

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INFONA - science communication portal

Search results for: T. Tokarski

The Effect of Rare Earth Addition on Microstructure and Mechanical Properties of the Rapidly Solidified Al-Si and Al-Si-Ni Alloys

Local composite reinforcements of TiC/FeMn type obtained in situ in steel castings

Local composite reinforcements of TiC/FeMn type obtained in situ in steel castings

Determinanty przestrzennego zróżnicowania płac na Ukrainie

Martensite stabilisation in single crystalline Ni-Mn-Ga and Ni-Mn-Sn magnetic shape memory alloys

Reactive casting coatings for obtaining in situ composite layers based on Fe alloys

Time to Reimplantation: Waiting Longer Confers No Added Benefit

Superelastic behavior of a metamagnetic Ni–Mn–Sn single crystal

Thermal range of cementite occurrence in hypereutectoid alloys with controlled C, Cr and Mn content

Wpływ zmian PKB na przestrzenne zróżnicowanie bezrobocia na Ukrainie

Zróżnicowanie rozwoju ekonomicznego krajów UE na podstawie grawitacyjnego modelu wzrostu

Ekonomiczne determinanty migracji międzywojewódzkich

Study of Investment Casting Technology from Bronze Age. Casting Workshop in Grzybiany (Southwest Poland)

Microstructure, Hardness and Wear Resistance of Local TiC-ZrO2/FeCr Reinforcement Fabricated in Situ in Steel Castings

Micromechanical behaviour of a two-phase Ti alloy studied using grazing incidence diffraction and a self-consistent model

The Investigation of Strain-Induced Martensite Reverse Transformation in AISI 304 Austenitic Stainless Steel

The γ′-Ni3(Al,Ta) phase triggered strengthening of the Ni-Ta-Al-Cr-C coating layer, deposited on austenitic stainless steel

Persistent Radicals of Self‐assembled Benzophenone bis‐Urea Macrocycles: Characterization and Application as a Polarizing Agent for Solid‐state DNP MAS Spectroscopy

Branched needle microstructure in Ni-Mn-Ga 10M martensite: EBSD study

The effect of temperature on the evolution of eutectic carbides and M7C3 → M23C6 carbides reaction in the rapidly solidified Fe-Cr-C alloy

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