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Wyświetlanie 1-10 z 141
Tytuł:
Electroplastic Effect of High Manganese Austenitic Steel
Autorzy:
Zimniak, Z.
Dobras, D.
Powiązania:
https://bibliotekanauki.pl/articles/353766.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electroplastic effect
high manganese steel
TWIP effect
Opis:
The article presents the results of the investigations performed on high manganese austenitic steel which underwent the test of uniaxial tension, with the application of electric current impulses. The application of low voltage impulse alternating current of high intensity during the plastic deformation of the examined steel caused the occurrence of the electroplastic effect, which changed the shape of the stress-strain curve. A drop of flow stress and elongation of the tested material was observed in the case of the application of electric current impulses, in respect of the material stretched without such impulses and stretched at an elevated temperature. The analysis of the morphology of the fractures showed differences between the samples tested under the particular conditions. An analysis of the alloy’s microstructure was also performed under different conditions. The application of electric current impulses can have a significant influence on the reduction of the forces in the plastic forming processes for this type of steel.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 431-436
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attempts to Modify Austenitic Steel with Carbon Nanotubes
Autorzy:
Górka, Jacek
Kik, Tomasz
Burda, Michal
Powiązania:
https://bibliotekanauki.pl/articles/2048816.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiwalled carbon nanotubes
carburizer
austenitic steel
TIG remelting
structure modification
Opis:
In this work, research on influence of multiwalled carbon nanotubes (MWCNTs), produced in Catalic Chemical Carbon Vapor Deposition, NANOCYLTM NC7000CNTs on a structure and properties of AISI 301 steel remelted by TIG arc. In the assessment of influence a type of carbon on properties and structure of austenitic steel, as a carbon filler was use also carburizer. In the specimens (AISI 301 plates) with dimensions 155×60×7 [mm] were drilled holes with 1.3 mm diameter and placed 0.5 mm under specimen surface. Next, to the drilled holes was implemented CNTs, carburizer and mixture of these both powders. Prepared specimens were remelted by TIG method on the CASTOTIG 2200 power source with 2.4 mm tungsten thoriated electrode with parameters sets for obtain 3.0 mm penetration depth. Remelted specimens were cut into the half of the welds distance and prepared for metallographic examinations. Cross sections of the specimens were tested on classical metallography microscopes, hardness tests, SEM analyses (on JEOL 5800 LV SEM EDX equipment) and phase identification by X-ray phase analysis on Philips APD X’Pert PW 3020 diffractometer. Hardness analysis indicates about 25% increase of hardness in the remelted area when the CTNs are used. In the specimens with carburizer there is no significant changes. SEM analyses of remelted areas on AISI 301 specimens modificated with CNTs, indicates that dark areas, initially interpret as one of the phase (based on optical microscope) is finally densely packed bladders with dimensions from 50 nm up to a few µm. These bladders are not present in the specimens with carburizer filler. High resolution scanning microscopy allow to observe in the this area protruding, longitudinal particles with 100-300 nm length. For identification of this phase, X-ray analysis was done. But very small dimensions of used CNTs (diameters about 9,5 nm), random orientation and small weight amount can make difficult or impossible to CNTs detection during XRD tests. It means that it is not possible to clearly determine nature of particles filling the cavities, it is only possible to suppose that they are CNTs beams with nanoparticles comes from their disintegration. Results of the researches indicates, that fill in the weld pool with different form of carbon (CNTs and carburizer) it is possible to achieve remelted beads with different structure and hardness distribution. It confirms validity of the research continuation with CNTs as a modifier of steels and also other metals and theirs alloys.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 349-356
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of seawater salinity on corrosion of austenitic steel
Autorzy:
Starosta, Robert
Powiązania:
https://bibliotekanauki.pl/articles/245480.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
austenitic steel
corrosion
potetiodynamic test
seawater
Opis:
Due to the paramagnetic properties and the ability to passivation, for the production of hulls of some vessels (mainly warships), corrosion-resistant (stainless) steels with austenitic structure are used. This article describes the influence of seawater salinity on selected corrosion properties of high-alloy steel X5CrNi 18-10 (304). The average salinity of the seas is taken as 3.5% content of sodium chloride. Corrosion rate of the tested material was evaluated in an aqueous solution of sodium chloride was evaluated. The NaCl concentration in corrosive solutions was 0.7%, 1.4%, 2.1%, 2.8%, 3.5%, 4.2%. Corrosion tests were performed using the potentiodynamic method. The range of electrochemical potential changes was Ecorr ±150 mV. Corrosion rate was assessed on the basis of corrosion current density measurements. Corrosion potential values against the saturated calomel electrode were also determined. Based on the obtained measurement results and non-parametric significance tests carried out, a significant influence of seawater salinity on the value of corrosion current density and corrosion potential was found. The highest value of corrosion current density (jcorr), and thus the highest corrosion rate, was recorded for 3.5% NaCl solution. In the concentration range from 0.7 to 3.5% NaCl in solution, the corrosion rate of austenitic steel increases. A further increase in salinity of electrolyte results in the inhibition of corrosion rate of steel. There is almost a full negative, linear correlation between the proportion of sodium chloride in the corrosive solution and the value of corrosion potential. Along with the rise in the salinity of seawater, increase the electrochemical activity, and thus the corrosion susceptibility, thus the corrosion susceptibility, of the austenitic steel X5CrNi 18-10 was observed.
Źródło:
Journal of KONES; 2019, 26, 3; 219-225
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermoelastic effect in austenitic steel referred to its hardening
Autorzy:
Pieczyska, E.
Powiązania:
https://bibliotekanauki.pl/articles/280245.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thermoelastic effect
polycrystaline metal
consecutive deformation
Opis:
The effect of thermomechanical coupling occuring in metal during consecutive tensile tests, were examined. The temperature, stress and strain characteristic were found both in elastic and plastic ranges. The change of the character of the sample temperature was employed as a criterion for the limit between the elastic and plastic regimes. The thermomechanical coupling effects were interpreted in terms of the material microstructure evolution and referred to its strain hardening degree. A quite precise evaluation unloading seems to be particularly valuable.
W pracy wykazano w sposób doświadczalny, że ze wzrostem umocnienia, co wiąże się ze zwiększeniem ilości i ewolucją defektów w materiale, wzrasta efekt termosprężysty oraz efekt termosprężystego odciążania. Umocnienie realizowano drogą kolejnych cyklicznych obciążeń, jak również odpowiednią wstępną obróbką materiału. Badaniom poddano próbki takiej samej stali austenitycznej o dwóch różnych stanach wyjściowych: po wygrzewaniu ujędrniającym oraz po 50% umocnieniu w wyniku walcowania na zimno. Badania przeprowadzono na maszynie wytrzymałościowej, rejestrując jednocześnie zmiany temperatury przy wykorzystaniu zestawu termowizyjnego z komputerową rejestracją i obróbką wyników doświadczalnych. Na podstawie charakterystyk mechanicznych oraz zmiany temperatury materiału próbki zbadano termosprężyste oraz termoplastyczne efekty sprzężeń termo-mechanicznych. Wykazano, że efekty tych sprzężeń wzrastają w miarę wzrostu umocnienia materiału. W próbkach po walcowaniu przeanalizowano rozwój lokalizacji odkształcenia plastycznego. Zaobserwowano, że odkształenie plastyczne zlokalizowane podczas pierwszego cyklu, rozwija się w tym samym miejscu w kolejnych cyklach deformacji. Wyższy wzrost temperatury w próbkach po walcowaniu występuje w miejscu lokalizacji, natomiast w miarę wzrostu odległości od tego miejsca stwierdzono coraz mniejsze przyrosty temperatury.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 2; 349-368
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibility of corrosion monitoring resistance of austenitic steel for ship construction
Autorzy:
Jurczak, W.
Jurczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/247396.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
electrochemical corrosion
austenitic steel
monitoring
Opis:
The article presents the investigation results on possibility of electrochemical corrosion monitoring of the 1.3964 steel used for ship construction according of the patent Pl 216723. The patent’s assumption describes the method of on-line registration of electrochemical potential specifying the protective effectiveness of a thin oxide layer formed spontaneously on the steel surface. Essentials drop of the potential’s value with respect to the stationary one indicates layer cracking and initiation of pitting corrosion. Such a corrosion can be initiated by salinity and temperature of seawater and/or by a mechanical factor (strain). The carried out measurements of the potential and mechanical-electrochemical teats made it possible to determine the stress level causing the crack of oxide layer and initiation of corrosion processes in the steel. Thereby, the mechanical properties (Rm and A5) thin passive oxide layers investigated steel. Application of Electrochemical Impedance Spectroscopy (EIS) in the laboratory allows monitoring of weakness (stratification) of the film as a stage preceding to fracture [1, 2]. Stress cracking of the protective oxide layer on the 1.3964 steel takes place beyond the exploitation zone (above the tensile strength) and there is no indication to monitor the corrosion resistance on ship construction made of this stainless steel. However, in specific cases when temperature of the steel exceeds 40oC, application of the monitoring may be justified.
Źródło:
Journal of KONES; 2016, 23, 1; 131-138
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Martensite Content of Cold-Worked AISI 304L Chromium-Nickel Austenitic Steel
Autorzy:
Opiekun, Z. A.
Pająk, D.
Powiązania:
https://bibliotekanauki.pl/articles/379888.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austenitic stainless steel
longitudinal rolling
martensitic phase
stal austenityczna
walcowanie wzdłużne
faza martenzytyczna
Opis:
The paper presents the effect of plastic strain occurring at room temperature in annealed samples of AISI 304L austenitic chromium-nickel steel on content of strain-induced &alpha′ martensite in its structure. The strain was introduced by longitudinal rolling of the samples with constant strain rate of about 300 mm/s and relative cold work ranging from 5% to 90% It has been demonstrated that the share of &alpha′ martensite in microstructure of the steel determined by means of Feritscope FMP30 depends on the degree of cold work.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 155-158
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of Belzona adhesive joints application for austenitic steel used in ship constructions
Autorzy:
Jurczak, W.
Jurczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/102361.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
austenitic steel
adhesive joints
shipbuilding
Hysol
Belzona
Opis:
This paper presents the results of research on adhesive joints durability properties of ship austenitic steel done with the use of the latest adhesives – glues: a composite one from Belzona company, described as 1111 and 1212 as well as a Hysol 9466 adhesive, produced by Hysol. The 1.4301 (304) and 1.3964 (2xx) steels used for shipbuilding were single-lap adhesive joint, with varying degree of edges’ chamfering and offsetting (with a deflection). This type of alternative connections will provide protection and temporary structure’s protection in case of emergency cracking (due to corrosion or an impact) of the examined steel or welded joints of the ship’s construction and hull’s sheathings. The adhesive joints of the tested steel were made in laboratory conditions (according to the technological card) as well as outside the laboratory, hereinafter called as the emergency ones with the use of Belzon 1212. Adhesive joints of 304 and 2xx steel using Hysol 9466 adhesive made in laboratory conditions showed better durability properties than the ones made with the use of Belzona 1111 composite. However, in case of emergency connections the bonding strength as well as the bonding time (hardening) are important factors. The use of the special Belzona 1212 (for wet surfaces) gives a relatively good durability of approx. 20MPa with a much shorter (up to 20 minutes) hardening time and does not require such an accurate surface preparation as the adhesive joints made with the use of Hysol 9466.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 134-140
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermophysical properties of 904L austenitic steel
Właściwości cieplnofizyczne stali austenitycznej 904L
Autorzy:
Nasiłowska, B.
Bogdanowicz, Z.
Terpiłowski, J.
Pańcikiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/264079.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
thermophysical properties
steel 904L
specific heat
thermal diffusivity
thermal conductivity
właściwości cieplno-fizyczne
stal 904L
ciepło właściwe
dyfuzyjność cieplna
przewodność cieplna
Opis:
This paper presents the results of the structural investigations and thermophysical properties of 904L steel parent material. Experimental studies on the structure of 904L steel proved a pure austenitic structure. Both the experimental research and analysis of the thermophysical properties of 904L steel were complemented with the results of the thermal conductivity calculations for the tested material. The paper presents a brief description of the measurements, the procedures for evaluating the data, and a set of the obtained results.
W pracy przedstawiono wyniki badań strukturalnych i właściwości cieplnofizyczne materiału rodzimego stali 904L. Badania eksperymentalne struktury stali 904L wykazały strukturę czysto austenityczną. Badania doświadczalne i analizę właściwości cieplnofizycznych stali 904L uzupełniono wynikami obliczeń przewodności cieplnej badanego materiału. W pracy przedstawiono zwięzły opis wykonywanych pomiarów, charakterystykę procedur opracowania danych oraz komplet uzyskanych wyników.
Źródło:
Metallurgy and Foundry Engineering; 2018, 44, 2; 61-71
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties of High-Mn Austenitic Steel Tested under Static and Dynamic Conditions
Autorzy:
Dobrzański, L. A.
Borek, W.
Mazurkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/356028.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high manganese steels
TWIP mechanism
strain rate
mechanical properties
structure
Opis:
The purpose of the paper is to investigate X73MnSiAlNbTi25-1-3 high manganese austenitic steel containing 0.73% C to determine structural mechanisms decisive for increasing a reserve of cold deformation energy of such steel. The influence of a strain rate on the structure of the investigated steels and on the structural mechanisms decisive for their properties was analysed. Specialist research instrumentation was used for this purpose such as Scanning Transmission Microscopy (including EBSD examinations), conventional and high-resolution transmission electron microscopy together with diffraction examinations and metallographic examinations. It was found that the principal cause of an increased reserve of cold deformation energy of the investigated steels in dynamic conditions is the activation of mechanical twinning in the mutually intersecting systems in austenite grains and annealing twins, which are densifying when a cold deformation rate is growing, thereby confirming the basic mechanism of TWIP (TWinning Induced Plasticity).
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 725-730
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 141

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