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Tytuł:
Non-isothermal annealing of AA7075 aluminum alloy - structural and mechanical effects
Nieizotermiczne wyżarzanie stopu aluminium AA7075 - efekty strukturalne i mechaniczne
Autorzy:
Pieła, K.
Błaż, L.
Sierpiński, Z.
Foryś, T.
Powiązania:
https://bibliotekanauki.pl/articles/354234.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nieizotermiczne wyżarzanie
stopy aluminium
wytrzymałość cieplna
aluminum alloy
annealing
thermal treatment
structure
Opis:
Calorimetric and dilatometric tests were performed on AA7075 aluminum alloy annealed at constant heating rate of 15 degree Celsjus/min in temperature range 20-470 degree Celsjus and discussed in relation to the hardness test and structure observation results. The samples were machined from furnace cooled material (FC), furnace cooled and deformed (FCD) material, solution treated (ST) material and solution treated and deformed (STD) material. It was found that the nucleation and growth of transition η and stable η (MgZn2) phases caused remarkable reduction of thermal expansion coefficient αt , whereas both the dissolution of phase and formation of GP zones were accompanied by an increase of αt value. While η phase started to dissolve at 250 degree Celsjus, a widespread endothermic effect was observed on DSC curves. Dissolution of η particles at high annealing temperatures was accompanied by the solid solution hardening of the alloy. Mentioned hardening process was overlapped by expected material softening that was ascribed to recovery and recrystallization processes. Because of superposition the solution hardening and recrystallization softening, recrystallization temperature could not be precisely defined on the basis of simple hardness measurements.
W pracy przedstawiono wyniki badań kalorymetrycznych, dylatometrycznych i pomiarów twardości stopu aluminium AA7075 poddanego nieizotermicznemu wyżarzaniu (nagrzewaniu ze stała prędkością) w zakresie temperatur 20-470 stopni Celsjusza. Badania objęły cztery stany metalurgiczne materiału: wolno studzony z piecem (FC), wolno studzony z piecem i odkształcony (FCD), przesycony (ST) oraz przesycony i odkształcony (STD). Stwierdzono, ze wydzielanie fazy pośredniej η' i równowagowej η(MgZn2) powoduje wyraźne obniżenie współczynnika rozszerzalności cieplnej αt , natomiast zarówno rozpuszczanie fazy η, jak i formowanie stref GP prowadzi do jego wzrostu. Rozpuszczanie fazy η rozpoczyna sie w temperaturze 250 stopni Celsjusza i towarzyszy mu rozległy efekt endotermiczny, a w zaawansowanym stadium rozpuszczania η także wzrost twardości przesycanych próbek, będący rezultatem umocnienia roztworowego stopu. Umocnienie roztworowe zakłóca tym samym efekt oczekiwanego mięknięcia materiału wskutek rekrystalizacji, co w konsekwencji utrudnia dokładna ocenę temperaturowego zakresu rekrystalizacji w oparciu o pomiary twardości.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 3; 703-709
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Molding Sand Technology Between Alphaset (APNB) and Furan (FNB)
Autorzy:
Ghosh, Dipak K.
Powiązania:
https://bibliotekanauki.pl/articles/381891.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Alphaset
Furan
foundries
molding sand
heat strength
residual strength
gases
environment
odlewanie
piasek formierski
wytrzymałość cieplna
Opis:
The paper focuses on investigation of properties of two most widely used self-set sand binder systems APNB and FNB across the Globe, for making molds and cores in foundries to produce castings of different sizes involving wide range of metals and alloys, ferrous and nonferrous. This includes study of compression strength values of samples made out of molding sand at different binder addition level using new, mechanically reclaimed (MR) and thermally reclaimed (TR) sand. Strength values studied include dry strength (at room temperature) at specified intervals simulating different stages of mold handling, namely stripping and pre heating, followed by degraded strength after application of thinner based zircon wash by brush, subsequent lighting of, then checking strength both in warm (degraded strength) & cold (recovered strength) conditions. Throughout the cycle of mold movement from stripping to knock out, strength requirements can be divided into two broad classifications, one from stripping to closing (dry strength) and another from pouring to knock out (hot & retained strength). Although the process for checking of dry strength are well documented, no method using simple equipments for checking hot & retained strength are documented in literature. Attempts have been made in this paper to use some simple methods to standardize process for checking high strength properties using ordinary laboratory equipments. Temperature of 450°C has been chosen by trial & error method to study high temperature properties to get consistent & amplified values. Volume of gases generated for both binders in laboratory at 850°C have also been measured. Nature of gases including harmful BTEX and PAH generated on pyrolysis of FNB and APNB bonded sands are already documented in a publication [1]. This exercise has once again been repeated in same laboratory, AGH University, Poland with latest binder formulations in use in two foundries in India.
Źródło:
Archives of Foundry Engineering; 2019, 4; 11-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymer matrix composite laminate under hygrothermal exposure
Autorzy:
Kormaníková, E.
Powiązania:
https://bibliotekanauki.pl/articles/131582.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Komisja Inżynierii Budowlanej PAN Oddział w Katowicach
Tematy:
polymer matrix composites
laminate plate
hygrothermal model
mechanical characteristics
thermal strength of ratio
moisture strength of ratio
internal forces
kompozyty z osnową polimerową
płyta laminowana
model higrotermiczny
właściwości mechaniczne
wytrzymałość cieplna
wilgotność
siły wewnętrzne
Opis:
The static load model of laminate with the hygrothermal load is considered in the paper. The corresponding ply properties are calculated using Mori-Tanaka method. A parametric study is conducted by varying the fiber volume fraction in one laminate layer and the fiber orientation of the angle plies in the laminate. The internal forces of laminate plate with symmetric and unsymmetric stacking of layers are investigated.
Źródło:
Roczniki Inżynierii Budowlanej; 2016, 16; 49-54
1505-8425
Pojawia się w:
Roczniki Inżynierii Budowlanej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
T6 Heat Treatment of Hypo-eutectic Silumins in Aspect of Improvement of Rm Tensile Strength
Autorzy:
Pezda, J.
Powiązania:
https://bibliotekanauki.pl/articles/379746.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
modification
ATD
tensile strength
obróbka cieplna
modyfikacja
wytrzymałość na rozciąganie
Opis:
Improvement of properties of silumins in scope of classic methods is connected with changes in morphology of silicon precipitation through: process of modification of alloy, maintaining a suitable temperature of overheating and pouring into moulds, as well as perfection of heat treatment processes. Obtained structure of casting have a direct influence on mechanical and technological properties of machinery parts, and therefore, usage of knowledge on crystallization to control of crystallization’s kinetics of castings in order to optimize obtained structure and introduction of modern methods of heat treatment, enabling considerable improvement of mechanical and technological properties, becomes an important factor. Dispersion hardening with soaking of alloy near temperature of solidus, consisting in heating of poured specimens to temperature of solutioning, keeping in such temperature, cooling down in cold water (20oC), and next operation of artificial ageing have effect on change of tensile strength Rm of a selected hypo-eutectoid silumins. Selection of suitable parameters of dispersion hardening is condition of obtainment of positive results in terms of improvement of tensile strength Rm and has effect on its economic aspects.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2s; 49-52
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Shortened Heat Treatment on Change of the Rm Tensile Strength of the 320.0 Aluminum Alloy
Autorzy:
Pezda, J.
Powiązania:
https://bibliotekanauki.pl/articles/381551.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
ATD
heat treatment
tensile strength
stop aluminium
metoda ATD
obróbka cieplna
wytrzymałość na rozciąganie
Opis:
Mechanical and technological properties of castings made from 3xx.x alloys depend mainly on properly performed process of melting and casting, structure of a casting and mould, as well as possible heat treatment. Precipitation processes occurring during the heat treatment of the silumins containing additives of Cu and/or Mg have effect on improvement of mechanical properties of the material, while choice of parameters of solutioning and ageing treatments belongs to objectives of research work performed by a number of authors. Shortened heat treatment, which is presented in the paper assures suitable mechanical properties (Rm), and simultaneously doesn’t cause any increase of production costs of a given component due to long lasting operations of the solutioning and ageing. Results of the research concern effects of the solutioning and ageing parameters on the Rm tensile strength presented in form of the second degree polynomial and illustrated in spatial diagrams. Performed shortened heat treatment results in considerable increase of the Rm tensile strength of the 320.0 alloy as early as after 1 hour of the solutioning and 2 hours of the ageing performed in suitable.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 75-78
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości mechaniczne wysokostopowego, utwardzanego dyspersyjnie staliwa martenzytycznego, poddanego wielostopniowej obróbce cieplnej
Mechanical properties of high-alloyed dispersion-hardened, martensitic cast steel after multi-stage heat treatment
Autorzy:
Kuder, M.
Powiązania:
https://bibliotekanauki.pl/articles/391739.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
staliwo martenzytyczne
azot
obróbka cieplna
wytrzymałość
udarność
martensitic cast steel
nitrogen
heat treatment
strength
impact resistance
Opis:
Wykonano wytop staliwa wysokostopowego Cr-Ni-Cu zawierającego dodatki Mo i Nb oraz podwyższoną zawartość azotu. Odlane wlewki próbne poddano obróbce cieplnej. Wykonano badania metalograficzne przy użyciu mikroskopu optycznego i oznaczenia właściwości mechanicznych. Stwierdzono, że najefektywniejszymi cyklami obróbki cieplnej badanego staliwa są: dla uzyskania najwyższych twardości - przesycanie z temperatury 1060°C i odpuszczanie w 500°C, dla uzyskania najwyższych wytrzymałości - przesycanie i podwójne odpuszczanie w temperaturze 600°C. Dla uzyskania maksymalnego wydłużenia i udarności można zastosować hartowanie z temperatury 950°C z odpuszczaniem w temperaturze 600°C.
High-alloyed Cr-Ni-Cu cast steel with additions of Mo and Nb and high nitrogen content was melted. The cast test ingots were subjected to a heat treatment. Metallographic examinations were made under an optical microscope and mechanical properties were determined. The most effective heat treatment cycles applied to the examined cast steel have proved to be the following ones: to obtain maximum hardness - solution heat treatment from 1060°C and tempering at 500°C, to obtain maximum strength - solution heat treatment and double tempering at 600°C. To obtain maximum elongation and impact resistance - quenching from 950°C followed by tempering at 600°C.
Źródło:
Prace Instytutu Odlewnictwa; 2009, 49, 3; 5-11
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Heat Treatment Parameters on the Toughness of Unalloyed Ausferritic Ductile Iron
Autorzy:
Guzik, E.
Sokolnicki, M.
Nowak, A.
Powiązania:
https://bibliotekanauki.pl/articles/382323.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ductile cast iron
heat treatment
ADI
toughness
mechanical properties
ausferrite
żeliwo sferoidalne
obróbka cieplna
wytrzymałość
właściwości mechaniczne
Opis:
Studies were carried out to determine the effect of heat treatment parameters on the plastic properties of unalloyed ausferritic ductile iron, such as the elongation and toughness at ambient temperature and at – 60°C. The effect of austenitizing temperature (850, 900 and 950°C) and ausferritizing time (5 - 180 min.) at a temperature of 360°C was also discussed. The next step covered investigations of a relationship that is believed to exist between the temperature (270, 300, 330, 360 and 390°C) and time (5, 10, 30, 60, 90, 120, 150, 180, 240 min.) of the austempering treatment and the mechanical properties of unalloyed ausferritic ductile iron, when the austenitizing temperature is 950°C. The “process window” was calculated for the ADI characterized by high toughness corresponding to the EN-GJS-800-10-RT and EN-GJS-900-8 grades according to EN-PN 1564 and to other high-strength grades included in this standard. Low-alloyed cast iron with the nodular graphite is an excellent starting material for the technological design of all the ausferritic ductile iron grades included in the PN-EN-1624 standard. The examined cast iron is characterized by high mechanical properties stable within the entire range of heat treatment parameters.
Źródło:
Archives of Foundry Engineering; 2016, 16, 2; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat Treatment of a Casting Element of a Through Clamp to Suspension of Electric Cables on Line Post Insulators
Autorzy:
Pezda, J.
Powiązania:
https://bibliotekanauki.pl/articles/379668.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
aluminum alloys
ATD
tensile strength
hardness HB
obróbka cieplna
stopy aluminium
wytrzymałość na rozciąganie
twardość
Opis:
Heat treatment of a casting elements poured from silumins belongs to technological processes aimed mainly at change of their mechanical properties in solid state, inducing predetermined structural changes, which are based on precipitation processes (structural strengthening of the material), being a derivative of temperature and duration of solutioning and ageing operations. The subject-matter of this paper is the issue concerning implementation of a heat treatment process, basing on selection of dispersion hardening parameters to assure improvement of technological quality in terms of mechanical properties of a clamping element of energy network suspension, poured from hypoeutectic silumin of the LM25 brand; performed on the basis of experimental research program with use of the ATD method, serving to determination of temperature range of solutioning and ageing treatments. The heat treatment performed in laboratory conditions on a component of energy network suspension has enabled increase of the tensile strength Rm and the hardness HB with about 60-70% comparing to the casting without the heat treatment, when the casting was solutioned at temperature 520 oC for 1 hour and aged at temperature 165 oC during 3 hours.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 89-94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of T6 Heat Treatment Parameters on Technological Quality of the AlSi7Mg Alloy
Autorzy:
Pezda, J.
Jarco, A.
Powiązania:
https://bibliotekanauki.pl/articles/383288.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
aluminum alloy
tensile strength
elongation
impact strength
obróbka cieplna
stop aluminium
wytrzymałość na rozciąganie
wydłużenie
udarność
Opis:
Very well-known advantages of aluminum alloys, such as low mass, good mechanical properties, corrosion resistance, machining-ability, high recycling potential and low cost are considered as a driving force for their development, i.e. implementation in new applications as early as in stage of structural design, as well as in development of new technological solutions. Mechanical and technological properties of the castings made from the 3xx.x group of alloys depend mainly on correctly performed processes of melting and casting, design of a mould and cast element, and a possible heat treatment. The subject-matter of this paper is elaboration of a diagrams and dependencies between parameters of dispersion hardening (temperatures and times of solutioning and ageing treatments) and mechanical properties obtained after heat treatment of the 356.0 (EN AC AlSi7Mg) alloy, enabling full control of dispersion hardening process to programming and obtaining a certain technological quality of the alloy in terms of its mechanical properties after performed heat treatments. Obtained results of the investigations have enabled obtainment of a dependencies depicting effect of parameters of the solutioning and ageing treatments on the mechanical properties (Rm, A5 and KC impact strength) of the investigated alloy. Spatial diagrams elaborated on the basis of these dependencies enable us to determine tendencies of changes of the mechanical properties of the 356.0 alloy in complete analyzed range of temperature and duration of the solutioning and ageing operations.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 95-100
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Content of Furfuryl Alcohol Monomer on the Process of Moulding Sands Thermal Destruction
Wpływ zawartości monomeru alkoholu furfurylowego na proces destrukcji cieplnej mas formierskich
Autorzy:
Dobosz, S. M.
Drożyński, D.
Jakubski, J.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/354435.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moulding sand
thermal destruction
bending strength
hot-distortion
piasek formierski
deformacja cieplna
wytrzymałość na zginanie
formowanie na gorąco
Opis:
The article discusses the issue of the influence of furfuryl alcohol content in resin binders on properties of moulding sand at elevated temperature. Reducing the share of this component - due to the requirements of the European Union regarding its toxicity - may cause a decrease in temperature of moulding sands’ destruction and, consequently, the thermal deformation of moulds and the creation of many casting defects. The study examined the impact of the furfuryl alcohol content of the thermal destruction processes and on the strength of the moulding sand at an ambient temperature and the tendency to thermal deformation.
W artykule omówiono zagadnienie wpływu zawartości alkoholu furfurylowego w spoiwach żywicznych na właściwości mas formierskich w podwyższonej temperaturze. Zmniejszenie udziału tego składnika – spowodowane wymaganiami Unii Europejskiej odnośnie jego toksyczności – może powodować obniżenie temperatur destrukcji masy, a w konsekwencji deformację cieplną form i powstanie wielu wad odlewniczych. W pracy przebadano wpływ zawartości alkoholu furfurylowego na procesy cieplnej destrukcji spoiwa a także na wytrzymałość masy w temperaturze otoczenia oraz skłonność do deformacji cieplnej.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 1093-1096
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Various Types of Heat Treatment on Mechanical Properties of the EN AC-AlSi6Cu4 Alloy
Autorzy:
Jarco, A.
Pezda, J.
Powiązania:
https://bibliotekanauki.pl/articles/382485.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
aluminum alloy
ATD method
elongation
tensile strength
obróbka cieplna
stop aluminium
metoda ATD
wydłużenie
wytrzymałość na rozciąganie
Opis:
The Al-Si-Cu alloys with content of the copper from 2 to 4 percent, after solutioning and artificial ageing treatments (T6 heat treatment), feature high strength and very high hardness, however their elongation is considerably reduced. Maintaining value of elongation on the level of initial alloy is possible due to homogenizing treatment performed prior the T6 treatment. Performed strength tests of the initial alloy and the alloy after individual types of the heat treatment enable comparison of obtained results and assessment of usability of the investigated alloy to production of a castings. Test pieces to the strength tests were poured in standardized metal moulds. Parameters of the heat treatment, temperature and duration of heating were established on base of the literature and the ATD diagram performed for the investigated alloy. Investigated EN AC-AlSi6Cu4 alloy after homogenizing treatment becomes plastic, its elongation A5 and its impact strength KC increase nearly three times, with slight decrease of the tensile strength Rm. Dispersion hardening in connection with the homogenizing treatment results in increase of the tensile strength Rm with 68%, hardness and impact strength with 40% with elongation at level of the alloy without heat treatment. Making suitable selection of various types of the heat treatment it is possible, depending on needs, to control mechanical properties of the alloy.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2 spec.; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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