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Wyświetlanie 1-4 z 4
Tytuł:
Kształtowanie struktury i twardości brązu fosforowego UNS C51100 zgniotem i wyżarzaniem
Structure and hardness formation of UNS C51100 phosphor bronze by cold work and annealing
Autorzy:
Szykowny, T.
Romanowski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/2071825.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
brąz fosforowy
zgniot
rekrystalizowanie
phosphor bronze
cold work
recrystallization
annealing
Opis:
Brąz fosforowy UNS C51100 w postaci pasów o grubości 0,4 mm wyżarzono w temperaturze 600°C. Wyżarzony brąz walcowano na zimno ze zgniotem 20,40,60 lub 80%. Twardość brązu wzrosła od 90 HV do 240 dla Z = 80%. Zgnieciony brąz wyżarzano w temperaturze od 100 do 700°C. Z równania Avrami'ego wyznaczono temperaturę rekrystalizacji, która dla zgniotu 60% wynosi 408°C. Temperatura rekrystalizowania zawiera się przedziale 450 + 500°C. Dalszy wzrost temperatury skutkuje rozrostem ziaren.
UNS C51100 phosphor bronze in a form of 0.4 mm strips was subjected to full annealing at 600°C. The annealed bronze was cold rolled with the cold work of 20,40, 60 and 80%. The bronze hardness increased from 90 to 240 HV for Z = 80%. The cold worked bronze was annealed at the temperatures ranging'from 100 to 700°C. Recrystallization temperature of the bronze was determined using the Avrami equation and ultimately equals 408°C for 60% of cold work. Recrystallization temperature ranged from 450 to 500°C. A further increase in temperature resulted in grain growth.
Źródło:
Inżynieria i Aparatura Chemiczna; 2012, 5; 254-255
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case Study of Composite Chassis Manufacturing Process Using Low Temperature Molds Tempered with Gradual Heat Annealing Process
Autorzy:
Rządkowski, Witold
Klik, Przemysław
Tracz, Jan
Kowalik, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2201751.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
monocoque
manufacturing
out-of-autoclave
manufacturing process
gradual heat annealing
Opis:
This case study describes a manufacturing process of composite chassis also known as monocoque. The structure is made using carbon fibre reinforced polymers (CFRP) which are manufactured in out-of-autoclave (OOA) process from pre-impregnated carbon fabrics and aluminium alloy honeycomb core. Since the material cost is high the aim of the project was to reduce the cost of manufacturing process i.e. cost of models and moulds. Therefore, instead of high-temp models and moulds a cheaper alternative was used. It consisted of Styrofoam models made using polyurethane (PU) paste and moulds made from CFRP using wet layup process which were cured at room temperature. Such moulds had to be adapted to withstand high temperatures during pre-preg cure. This was done with gradual heat annealing process which increased the maximum service temperature from 45C to 90C. This was enough for the low-temp cure of pre-preg material, but it might be possible to increase the temperature even further. As a result, the cost of manufacturing process had been reduced by 50%.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 12--21
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Features of Formation Stress State of Amorphized Detonation Coatings of the Zr-Al-B Systems
Autorzy:
Pashechko, Mykhaylo
Kharchenko, Olena
Shchepetov, Vitaliy
Lenik, Klaudiusz
Gladkiy, Yaroslav
Powiązania:
https://bibliotekanauki.pl/articles/102275.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
amorphous coatings
residual stresses
annealing temperature
wear resistance
detonation spraying
powłoki amorficzne
naprężenia szczątkowe
temperatura wyżarzania
odporność na zużycie
natrysk detonacyjny
Opis:
The results of experimental studies on the dependence of the thickness of amorphous-crystalline Zr-Al-B coatings on the value and level of distribution of type 1residual stresses were presented. It was demonstrated that residual compressive stresses arise in the surface layers of coatings, which in absolute value are not significant for its integrity and quality. It was established that the amorphous-crystalline composition, under the conditions of minimizing residual stresses and the optimal combination of the volume fraction of components, the structure and morphology of their components, has the best surface strength and wear resistance under friction compared to tungsten carbide and iron coatings
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 2; 46-50
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft-Sensing in Batch Annealing Based on Finite Differential Method and Support Vector Regression
Autorzy:
Kačur, Ján
Durdán, Milan
Laciak, Marek
Flegner, Patrik
Powiązania:
https://bibliotekanauki.pl/articles/103270.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
annealing
steel coil
temperature measurement
soft-sensing
finite differences method
support vector regression
wyżarzanie
cewka stalowa
pomiar temperatury
wyczuwanie
metoda różnic skończonych
regresja wektora nośnego
Opis:
The temperature of annealed steel coils is a determining variable of the future steel sheets quality. This variable also determines the energy consumption in operation. Unfortunately, the monitoring of coil inner temperature is problematic due to the furnace environment with high temperature, coil structure, and annealing principle. Currently, there are no measuring principles that can measure the temperature inside the heat-treated product in a non-destructive manner. In this paper, the soft sensing of inner temperature based on the theory of non-stationary heat conduction and approach based on Support Vector Regression (SVR) was presented. The results showed that a black-box approach based on the SVR could replace an analytic approach, though with lesser performance. Several annealing experiments were performed to create a training data set and model performance improvement in the estimation of inner coil temperatures. The proposed software based on non-stationary heat conduction can calculate the behavior of inner coil temperature from the measured boundary temperatures that are measured by thermocouples. The soft-sensing principles presented in this paper were verified under laboratory conditions and on the data obtained from a real annealing plant.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 4; 70-86
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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