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Wyświetlanie 1-4 z 4
Tytuł:
Yield point determination based on thermomechanical behaviour of polycrystalline material under uniaxial loading
Autorzy:
Litwinko, R.
Oliferuk, W.
Powiązania:
https://bibliotekanauki.pl/articles/387294.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
materiał polikrystaliczny
produkcja
stal austenityczna
stop aluminium
polycrystalline material
yield
uniaxial loading
austenitic steels
aluminium alloy
Opis:
The paper is devoted to yield point determination based on the thermomechanical coupling that takes place in the material during its uniaxial tension. Experiments were performed on aluminum alloy and on austenitic steels. The stress value corresponding to the temperature minimum is treated as the critical resolved stress at which plastic deformation on the macroscopic scale begins. The obtained results are compared with values of stress which produces the irreversible strain equal to 0.2%. Such value of the stress is usually regarded as the yield point determined from the stress-strain curve. It is found that the values of yield point determined on the ground of the thermomechanical coupling are lower than these obtained from stress-strain curve.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 4; 49-51
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation properties of tailor-welded blank made of dual phase steels
Autorzy:
Schrek, A.
Švec, P.
Gajdošová, V.
Powiązania:
https://bibliotekanauki.pl/articles/386458.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
dual phase steels
tailor welded blank
drawn part
crash test simulations
reaction force
stal dwufazowa
crash test
symulacja
Opis:
The paper is dedicated to forming and properties of passenger car´s B-pillar reinforcement drawn from simple blank and alternatively tailor-welded blank (TWB). Drawn part is characterised by a place with a large strain, while forming process simulation did not confirm the creation of crack using the TWB consisting of dual phase HCT980X instead of previous HCT600 steel. It is because HCT980X steel has higher strength and lower ductile properties. The analysis of properties of drawn parts is focused on the simulated crash test in Dynaform software. Obtained sizes of drawn forces in simulated frame of the drawn parts and their comparison proved the possibility of the replacement the 1.2 mm thick simple blank from HCT600 steel with the 1 mm thick TWB consisting of HCT600 and HCT980X steel. The changed thickness of the simple blank caused 20% weight saving while containing the same properties of the drawn part.
Źródło:
Acta Mechanica et Automatica; 2016, 10, 1; 38-42
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of plasma nitriding process conditions on corrosion resistance of 440B martensitic stainless steel
Autorzy:
Łępicka, M.
Dahlke, M.
Powiązania:
https://bibliotekanauki.pl/articles/386879.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stainless steels
corrosion
surface modification techniques
plasma nitriding
surgical instruments
stal nierdzewna
korozja
modyfikacja powierzchni
azotowanie plazmowe
narzędzia chirurgiczne
Opis:
Martensitic stainless steels are used in a large number of various industrial applications, e.g. molds for plastic injections and glass moldings, automotive components, cutting tools, surgical and dental instruments. The improvement of their tribological and corrosion properties is a problem of high interest especially in medical applications, where patient safety becomes a priority. The paper covers findings from plasma nitrided AISI 440B (PN-EN or DIN X90CrMoV18) stainless steel corrosion resistance studies. Conventionally heat treated and plasma nitrided in N2:H2 reaction gas mixture (50:50, 65:35 and 80:20, respectively) in two different temperature ranges (380 or 450°C) specimens groups were examined. Microscopic observations and electrochemical corrosion tests were performed using a variety of analytical techniques. As obtained findings show, plasma nitriding of AISI 440B stainless steel, regardless of the process temperature, results in reduction of corrosion current density. Nevertheless, applying thermo-chemical process which requires exceeding temperature of about 400°C is not recommended due to increased risk of steel sensitization to intergranular and stress corrosion. According to the results, material ion nitrided in 450°C underwent leaching corrosion processes, which led to significant disproportion in chemical composition of the corroded and corrosion-free areas. The authors suggest further research into corrosion process of plasma nitrided materials and its degradation products.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 3; 156-159
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of heat treatment and plasma nitriding on corrosion resistance of 440B martensitic stainless steel
Autorzy:
Łępicka, M.
Grądzka-Dahlke, M.
Powiązania:
https://bibliotekanauki.pl/articles/386313.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stainless steels
corrosion
heat treatment
plasma nitriding
surgical instruments
stal nierdzewna
korozja
obróbka termiczna
azotowanie jarzeniowe
narzędzia chirurgiczne
Opis:
Reliability and durability assurance poses a serious challenge for surgical instruments manufacturers. Hard working conditions, such as intermittent contact with body fluids and hard bone tissues, as well as necessity to undergo frequent sterilisation processes, induce constant research into solutions capable of ensuring high wear resistance while maintaining satisfactory imperviousness to corrosion. Plasma nitriding is marked as the modern corrosion resistance improving method suitable for surgical instruments steels. The paper pre-sents findings from the heat treated and plasma nitrided AISI 440B (PN EN or DIN X90CrMoV18) steel corrosion resistance studies. Three conventionally heat treated (quenched with tempering in 250, 390 or 605°C) and three additionally plasma nitrided in N2:H2 reaction gas mixture (50:50, 35:65 and 20:80 ratio, respectively) specimens groups were examined. Furthermore, the authors evaluated the effect of machining - polishing and sandblasting - on investigated steel corrosion resistance. Microscopic observations and electrochemical corrosion tests were performed using a variety of analytical techniques. Results showed that, in comparison to conventional heat treatment, plasma nitriding of 440B stainless steel does not significantly affect its corrosive characteristics as far as the uniform nitride layer over the entire detail surface is obtained. The layer heterogeneity results in intensification of corrosion processes, making the material even more susceptible to corrosion than after conventional heat treatment, and contributing to severe, visible even with the unaided eye damages development.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 3; 155-159
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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