Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "alloy strength" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 55
Tytuł:
Change in the surface structure and the oxide layer of the Ti6Al4V ELI alloy as a result of mechanical and heat treatment
Autorzy:
Szota, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1537346.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
titanium alloy
oxide layer
alloy strength
stop tytanu
warstwa tlenkowa
wytrzymałość stopu
Opis:
Surface treatment, both mechanical, chemical and thermal causes a number of changes to the external structure of meterial details. The obtained properties are intended to improve the quality of material details made of a given alloy or pure metal. This paper presents the results of mechanical surface treatment to the thickness of the oxide layer after heat treatment of the TU6Al14V ELI alloy. The experiments were performed for a rod with a diameter of 5 mm cut into semicircular slices. The samples were mechanically activated by mechanical treatment of the surface: sandblasting with glass balls for 5 minutes, sanded with 40, 180, 220 and 800 grit sandpaper for 7.5 and 15 minutes. Using an optical microscope, the microstructure of the samples etched with Kroll's solution was assessed and the surface roughness parameters were measured. The next step was to carry out the heat treatment (at the temperature of 550 oC, for 5 hours), and then the roughness parameters and the thickness of the oxide layer were measured using a scanning microscope. The conducted research has shown that mechanical treatment of the surface resulting in an increase in surface development causes an increase in the thickness of the oxide layer formed during heat treatment. However, machining to reduce surface development, such as polishing, reduces the thickness of the oxide layer. The test results can be used to obtain the desired thickness of the oxide layer in the production of elements requiring increased resistance to wear or corrosion.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2021, 2; 12-21
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interpolation formulas for coefficients reducing the strength of steel and aluminum alloys in increasing temperatures
Formuły interpolacyjne współczynników redukcyjnych wytrzymałości stali i stopów aluminium w podwyższonej temperaturze
Autorzy:
Gwóźdź, M.
Powiązania:
https://bibliotekanauki.pl/articles/230860.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stal
aluminium
pożar
temperatura nagrzania
wytrzymałość stopu
właściwości mechaniczne
zmniejszenie wytrzymałości
steel
aluminum
fire
heating temperature
alloy strength
mechanical properties
strength reduction
Opis:
Heating of steel or structural aluminum alloys at a speed of 2 to 50 K/min – characterizing the fire conditions - leads to a reduction in mechanical properties of the analyzed alloys. The limit of proportionality fp, real fy and proof f02 yield limit, breaking strength fu and longitudinal limit of elasticity E decrease as the temperature increases. Quantitative evaluation of the thermal conversion in strengths of structural alloys is published in Eurocodes 3 and 9, in the form of dimensionless graphs depicting reduction coefficients and selected (tabulated) discrete values of mechanical properties. The author’s proposal for an analytical formulation of code curves describing thermal reduction of elasticity modulus and strengths of structural alloys recommended for an application in building structures is presented in this paper.
W obliczeniach statycznych konstrukcji metalowych oddziaływania temperatury uwzględnia się w dwóch sytuacjach projektowych. W pierwszej, zwykle trwałej lub przejściowej sytuacji obliczeniowej, temperatura ma charakter oddziaływań technologicznych, które mogą wystąpić zarówno w konstrukcjach stalowych jak i aluminiowych. Druga sytuacja ma charakter wyjątkowy, ponieważ dotyczy temperatury pożarowej, która może wystąpić tylko w budynkach o konstrukcji stalowej (wyroby hutnicze aluminiowe oraz stalowe klasy 4 nie nadają się na konstrukcje budynków zagrożonych potencjalnym pożarem). Przywołany podział oddziaływań temperatury ma dość istotne znaczenie z uwagi na wymaganą dokładność dopasowania formuł analitycznych do wyników empirycznych zestawionych w normach. Nagrzewanie stali lub konstrukcyjnych stopów aluminium z szybkością od 2 do 50 K/min - charakteryzującą warunki technologiczne i pożarowe, prowadzi do redukcji właściwości mechanicznych analizowanych stopów.
Źródło:
Archives of Civil Engineering; 2017, 63, 2; 39-54
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of process stability and weld quality of underwater wet flux-cored arc welding of low-alloy high-strength steel with oxy-rutile wire
Autorzy:
Li, Hongliang
Liu, Shixiong
Ma, Qiang
Wang, Pengfei
Liu, Duo
Zhu, Qiang
Powiązania:
https://bibliotekanauki.pl/articles/1955594.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
arc stability
weld quality
low alloy high-strength steel
underwater wet welding
Opis:
The paper described the experimental findings of underwater wet welding of E40 steel using self-shielded flux-cored wire with a TiO2 -FeO-MnO slag system. The arc stability, weld quality and corrosion resistance with different heat inputs were studied. The results showed that the wet welding process of the designed wire displayed good operability in the range of investigated parameters. The microstructure and mechanical properties of the weld metal depended on the heat input. Due to the high fraction of acicular ferrite in the weld metal, the mechanical properties of the weld metal under low heat input had better tensile strength and impact toughness. Fracture morphologies at low heat input had uniform and small dimples, which exhibited a ductile characteristic. The diffusible hydrogen content in the deposited metal obtained at a heat input of 26 kJ/cm significantly reduced to 14.6 ml/100g due to the combined effects of Fe2 O3 addition and the slow solidification rate of molten metal. The microstructure also had a significant effect on the corrosion resistance of the weld metal. The weld metal with high proportions of acicular ferrite at low heat input exhibited the lowest corrosion rate, while the base metal possessed a reduced corrosion resistance. These results were helpful to promote the application of low alloy high strength steel in the marine fields.
Źródło:
Polish Maritime Research; 2021, 3; 100-109
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlations of Mechanical Properties and Microstructure at Specific Zones of Welded Joint of High-Strength Low-Alloy Steels
Autorzy:
Ivanović, L.
Marjanović, V.
Ilić, A.
Stojanović, B.
Lazić, V.
Powiązania:
https://bibliotekanauki.pl/articles/354032.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-strength low-alloy steel
welded joint
mechanical properties
microstructure
Opis:
This paper presents experimental testing of the mechanical characteristics and properties of samples made of high-strength low-alloy steel with two different multi pass V grove butt welded joint. Two sample groups are tested: the root pass is made by manual metal arc welding process for the former and metal inert gas welding process for the latter. Other passes of those multi passes welded joints are made by metal active gas welding process. Further, the research included analyses of the experimentally obtained mechanical properties and load response of the samples in correlations to microhardness distribution and microstructural state at specific zones of the welded joints. Since both the chemical composition and microstructural state of high-strength low-alloy steel originate from special production processes their nature must be fully understood. Accordingly, the nature of the steels should directly impact not only the selection and definition of welding but the design process of mechanical constructions, too. From the practical aspect, mechanical characteristics and properties as well as load response of welded joints are crucial. But, sensitivity of those steels to inadequate welding technology and improper parameters or filler metal is high. On the other side, design codes and recommendations are not yet fully developed and precise. Results obtained in this research implicate that even small changes of welding technology causes the change of characteristics itself. Consequently, the steels development must be accompanied with the improvement of the welding processes and design modifications.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 285-292
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cold cracking of S460N steel welded in water environment
Autorzy:
Tomków, J.
Łabanowski, J.
Fydrych, D.
Rogalski, G.
Powiązania:
https://bibliotekanauki.pl/articles/258574.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underwater welding
wet welding
high-strength low-alloy steel
cold cracking
CTS test
Opis:
This paper shows results of weldability testing of fine-grained high -strength low- alloy S460N steel welded in water environment by covered electrodes. The tests were carried out by using the CTS test specimens with fillet welds. Four specimens were welded under water and one specimen in air. Welded joints were subjected to non-destructive visual and penetration tests. The accepted joints were then subjected to macroscopic and microscopic inspection and Vickers hardness measurements as well. The experiments showed that S460N steel welded in water environment is characterized by a high susceptibility to cold cracking.
Źródło:
Polish Maritime Research; 2018, 3; 131-136
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure evolution and mechanical properties of underwater dry welded metal of high strength steel Q690E under different water depths
Autorzy:
Sun, Kun
Huc, Yu
Shi, Yonghua
Liao, Baoyi
Powiązania:
https://bibliotekanauki.pl/articles/1573781.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underwater dry welding
high strength low alloy steel
water depth
microstructural evolution
mechanical property
Opis:
Q690E high strength low alloy (HSLA) steel has been intensively applied in maritime engineering. Also, the underwater dry welding (UDW) technique has been widely used to repair important offshore facilities. In this paper, joints of Q690E steel were fabricated through single-pass underwater dry welding at three pressures (0, 0.2, and 0.4 MPa). To study the effect of the pressure on the microstructure and mechanical properties of the UDW joint, an optical microscope (OM) and scanning electron microscope (SEM) were used to observe the microstructure and fracture morphology of the welded joints. The electron backscattered diffraction (EBSD) technique was used to analyse the crystallographic features and the crystallographic grain size of the ferrites. The proportion of acicular ferrite (AF) in the UDW joints and the density of low-angle boundaries increase dramatically with the increasing depth of water. The weld metal of UDW-40 shows higher strength because more fine ferrites and low-angle boundaries within UDW-40 impede the dislocation movement.
Źródło:
Polish Maritime Research; 2020, 4; 112-119
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In-Situ Observation of Acicular Ferrite Transformation in High-Strength Low-Alloy Steel Using Confocal Laser Scanning Microscopy
Autorzy:
Lee, Sang-In
Shin, Seung-Hyeok
Park, Hyeonwoo
Kim, Hansoo
Lee, Joonho
Hwang, Byoungchul
Powiązania:
https://bibliotekanauki.pl/articles/2174577.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acicular ferrite
high-strength low-alloy steel
confocal laser scanning microscopy
CLSM
phase transformation
in-situ observation
Opis:
In-situ observation of the transformation behavior of acicular ferrite in high-strength low-alloy steel using confocal laser scanning microscopy was discussed in terms of nucleation and growth. It is found that acicular ferrite nucleated at dislocations and slip bands in deformed austenite grains introduced by hot deformation in the non-recrystallization austenite region, and then proceeded to grow into an austenite grain boundary. According to an ex-situ EBSD analysis, acicular ferrite had an irregular shape morphology, finer grains with sub-grain boundaries, and higher strain values than those of polygonal ferrite. The fraction of acicular ferrite was affected by the deformation condition and increased with increasing the amount of hot deformation in the non-recrystallization austenite region.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1497--1501
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of effectiveness speed in mechanical properties of AW6060 T66 (PA38) alloy
Autorzy:
Panasiuk, K.
Powiązania:
https://bibliotekanauki.pl/articles/247214.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
alloy aluminum
static load
dynamic load
yield strength
strength limit
Opis:
The article examines the effect of the change in the speed of deformation on the mechanical properties of AW 6060 alloy specimens, characterized by high mechanical strength, which is a material used in the shipbuilding industry. The theoretical basis for the influence of load speed on the mechanical properties of materials is presented. Static and dynamic tensile test was conducted on a universal testing machine. Dynamic stretching was performed on samples at 10–1 s–1 – 102 s–1. Done charts and tables showing results. Calculated in accordance with DIN EN ISO 6892-1 2010P total elongation and contraction of the sample. Comparison of the results of the study with the current knowledge of the subject. Material studies have shown that increasing the deformation rate results in an increase in the yield point and tensile strength. On the basis of calculations of the narrowing and elongation of the total sample, the material can be strengthened. The rate of deformation of the materials is favourable for their strengthening by increasing the limit of tensile strength. Given that most of the design is subject to dynamic loads and the aluminum alloy AW 6060 finds extensive use in shipbuilding and beyond, these are satisfactory results.
Źródło:
Journal of KONES; 2017, 24, 4; 219-226
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of FSW welding parameters on the tensile strength of aluminum alloys
Autorzy:
Serier, Mohamed
Berrahou, Mohamed
Tabti, Affaf
Bendaoudi, Seif-E
Powiązania:
https://bibliotekanauki.pl/articles/94104.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
tensile strength
friction stir welding
aluminum alloy
ANOVA
Opis:
The friction stir welding process is an innovative technique for joining metals using plasticity, without presenting the fusion. It was first applied to aluminum alloys, for example copper, steel alloys, polymers and others. In this work the effects of the rotational speed, the speed of travel and the axial force of the tool were grouped in a mathematical model to quantify their influences on the weld seam. In this context and with of the experimental tests, the desired objective through this study is to describe the tensile strength of the cord resulting from this welding operation, for the qualification of this type of parts with an optimum adapted to a given application.
Źródło:
Archives of Mechanical Technology and Materials; 2019, 39; 41-45
2450-9469
Pojawia się w:
Archives of Mechanical Technology and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and Evaluation of Effect of Manganese Content on Properties of EN AC 46000 Aluminum Alloy
Autorzy:
Pasternak, Martyna
Brzeziński, Marcin
Piwowarczyk, Gabriela
Powiązania:
https://bibliotekanauki.pl/articles/107001.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
aluminum alloy
pressure casting
manganese
strength of material
Opis:
This article is the effect of industrial work and many surveys in the one of the Polish foundries that specialize in aluminum alloys. The main goal of our explorations is to evaluate the influence of manganese on Al-Si alloy properties. In die-cast alloys, it is recommended to use larger amounts of iron to reduce the impact on the pressure chamber and mold. Manganese neutralizes the harmful effect of iron by changing the morphology of the separated brittle ferrous phases. The unfavorable form of the iron-containing phases in the form of long needles changes into the forms of fine compact crystals, which are less harmful to the mechanical properties. Nowadays, the main client requirement is to obtain the right parameters at the best price. Specifically, the customer is in the automotive industry, where new technologies provide a connection between the high quality and low weight of car parts [1–3].
Źródło:
Journal of Casting & Materials Engineering; 2019, 3, 1; 14-18
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution and Characterization of Zirconium 702 alloy at various temperatures
Autorzy:
Lade, Jayahari
Dharavath, Baloji
Badrish, Anand
Kosaraju, Satyanarayana
Singh, Swadesh Kumar
Saxena, Kuldeep Kumar
Powiązania:
https://bibliotekanauki.pl/articles/28099558.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Zirconium 702 alloy
ANOVA
% elongation
ultimate tensile strength
yield strength
scanning electron microscope
Opis:
The Zirconium 702 alloy effectively used in nuclear industry at various critical conditions like high temperature and high pressure. This survey is an assessment of insights into the mechanical properties of the metal when exposed to different temperatures along the rolling direction.The main objective of this work is to characterize the tensile properties, and fracture study of broken tensile test samples at various temperatures.The tensile samples tested in our current work are 100°C, 150°C, and 200°C temperatures in different directions (0°, 45°, 90°) along with the rolling direction of the sheet. It is evident from the experimental results that temperatures significantly affect material properties. Temperature increases cause % elongation to increase, and strength decreases. ANOVA analysis revealed that temperature significantly influenced ultimate tensile strength (UTS), and yield strength (YS), as well as % elongation.The temperature contribution for UTS, YS, and % elongation is 41.90%, 31.60%, and 77.80% respectively. SEM fractured images showing the ductile type of behavior for all the temperatures.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 807--812
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Different Conditions on the Tensile Properties of AA7075-T6 During the Friction Stir Welding Process
Autorzy:
Sharma, Akash
Dwivedi, Vijay Kumar
Singh, Yesh Pal
Powiązania:
https://bibliotekanauki.pl/articles/28099543.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
tensile strength
aluminum alloy 7075
Taguchi Technique
microstructure
FSW
Opis:
In this paper the investigation of the FSW result characteristics on AA7075-T6 of the highest grade is carried out using different process parameters. A vertical milling machine with different FSW tool geometry is used to weld AA7075. When the tool rotational speed varies from 1200 and 1800 (rpm), different welding parameters are studied, the plunge depth of tool is between 0.14 and 0.20 mm, the table transverse speed range is between 20 and 50 (mm/min) and the tool shoulder diameter was 20 mm. The welding settings are optimized using the Taguchi approach. In this experimental investigation Taguchi Technique is utilized in this study to optimize three factorial and three level designs. The results show that when the rotating speed increases, the UTS of the welded joint increases, whereas the tensile strength of the welded joint decreases resulting to frictional heat created during the FSW process. Tensile strength decreases as feed increases and increases as rotational speed increases. For a 5 mm thick plate, tensile strength is optimal with a tool shoulder diameter of 20 mm, a rotational speed of 1600 rpm, feed rate of 30 mm/min and plunge depth. The shoulder diameter of 20 mm provides the maximum ultimate tensile strength when it is compared with all other tool shoulder diameter. The Al alloy AA7075-T6 plates, however, concurrently developed an equiaxial grain structure with a substantially smaller grain size and coarsened the precipitates.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 813--821
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric Analysis on the Progression of Mechanical Properties on FSW of Aluminum-Copper Plates
Autorzy:
Deepati, Anil Kumar
Alhazmi, Waleed
Zakri, Waleed
Shaban, Essam
Biswas, Pankaj
Powiązania:
https://bibliotekanauki.pl/articles/2180606.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
tool geometry
process parameters
micro-hardness
tensile strength
weld microstructure
Cu alloy
Al alloy
Opis:
The contemporary work manifests that friction stir welding (FSW) is a viable avenue for joining AA1100 aluminium (Al) to C12200 copper (Cu) plates. In this present study, the response of distinctive welding parameters (viz. tool geometries, tool rotational speed, tool travel speed, and tool plunging depth) on weld quality has been investigated. The present work focused on both microstructural investigation and mechanical properties examination. It has been observed that the process parameters have significant effects on weld quality. The design of the experiments has been executed considering four welding input parameters in two variables and selected L-16 orthogonal array to limit the experimental replications. It has been observed that good quality of welds produced by keeping the tool pin offset around 4mm towards the aluminium side and 2mm towards the copper side. And it has also been noticed that right-hand threaded tool pins are giving good weld quality compared to left-handed thread. The joint efficiencies for the welds E2, E14 which were welded by RHT tools were 75.3% and 74.61% and the Strength (UTS) of the welds for the same tools exhibit’s greater than the LHT tools i.e., 98 and 95Mpa. Moderate hardness values are observed for the same welds E1 and E14 with the parameters 1100rpm, 98welding speed, and 1.6mm tool plunge depth. . It also noticed that the weld quality can be significantly enhanced by using proper tool plunge and tool pin geometries compared to the other process parameters.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 2; 168--178
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Al-Zn-Mg alloy / Zircon Sand Reinforced Composites
Autorzy:
Satish Kumar, T.
Shalini, S.
Krishna Kumar, K.
Powiązania:
https://bibliotekanauki.pl/articles/351684.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Zn-Mg alloy
microstructure
hardness
tensile strength
wear
Opis:
Aluminium based metal matrix composite (Al-MMC’s) are much popular in the field like automobile and aerospace industries, because of its ease of fabrication process and excellent mechanical properties. In this study, Al-Zn-Mg alloy composite reinforced with 3, 6 and 9 v % of zircon sand was synthesised by stir casting technique. The microstructure of the composites revealed uniform distribution of reinforced particles. Hardness, tensile strength and wear resistance of Al-Zn-Mg alloy/zircon sand composite were found to increase with increase in v % percentage of zircon sand. Scanning Electron Microscope analysis of wear tested sample surface of composites revealed no evidence of plastic deformation of matrix phase. Particle pulls out and abrasive wear was the common feature observed from all the composites.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 689-695
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ recyklingu na strukturę i właściwości wytrzymałościowe odlewniczego stopu kobaltu stosowanego w stomatologii
Effect of recycling on structure and mechanical properties of dental casting cobalt alloy
Autorzy:
Surowska, B.
Beer, K.
Bieniaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/386681.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stomatologia
recykling
wytrzymałość
kobalt
stop
stomatology
recycling
strength
cobalt
alloy
Opis:
Pękanie metalowego szkieletu protez częściowych jest dość częstym przypadkiem w protetyce stomatologicznej. Główną przyczyną tego typu uszkodzenia jest niewłaściwa jakość odlewu. Ze względów ekonomicznych producenci stopów dopuszczają stosowanie złomu metalowego jako części wsadu. W pracy dokonano analizy wpływu recyklingu na właściwości mechaniczne i strukturę odlewniczego stopu kobaltu. Zastosowano odlewanie próżniowo-ciśnieniowe do wsadów zawierających 0%, 25% oraz 50% złomu pochodzącego z kanałów wlewowych i stożków odlewniczych stopu CoCrMo. Porównano właściwości mechaniczne i strukturę odlewów. Stwierdzono, że wytrzymałość mechaniczna wszystkich stopów jest niższa niż średnia deklarowana przez producenta. Przełomy mają charakter kruchy, z wyraźnie widoczną strukturą dendrytyczną. Wraz ze wzrostem udziału materiału wtórnie przetapianego rośnie niejednorodność struktury na przekroju poprzecznym próbek oraz gęstość mikropęknięć w objętości dendrytów po próbie rozciągania.
Cracking of the frame partial dentures is frequent case in dental prosthodontics. The wrong quality of cast is the main reason for this type of damage. The alloys producers allow to use the scrap metal as the part of charge on account of economy. In this paper an influence of recycling on mechanical properties and structure of Co-Cr-Mo dental alloy is carried out. The vacuum pressure casting was used. The charges consist of 0%, 25% and 50% of scrap metal from gate assembly. The mechanical properties and microstructure of precision castings was compared. It was found that all casts strength was lower than average one declared by producer. The brittle fractures and dendritic structures was observed. The structure inhomogeneity and density of microcracks inside dendrites after tension test increase along with percentage growth of scrap metal.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 3; 119-123
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 55

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies