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Tytuł:
The influence of the shape of weld nobs on the fatigue strength of S540Q steel
Autorzy:
Cicholska, M.
Powiązania:
https://bibliotekanauki.pl/articles/242857.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
weldability
high strength weldable steel
fatigue strength
Opis:
The development of weldable steels was discussed together with the methods of obtaining them. The influence of these methods on steel properties was explained. Research was performed on quenched weldable S540Q steel of high strength. Basic mechanical properties of this steel were determined. The results of a static tensile test and technological bending test were given. Next, steel sheets were welded by semi-automatic MAG method. The welds quality was examined and their future suitability was stated. Mechanical properties of the joints welded of this steel were determined. Mechanical properties of native material and welded joints were compared. Joints microstructure was examined in the weld axis, in the heat influence zone and in the native material. Fatigue tests were conducted in the cycle of nonsymmetrical tension – compression of welded joints. The analytical fatigue strength was obtained and it was compared with fatigue strength of welded joints. Tests results were elaborated with the static analysis of linear regression. Wohler diagrams were made after conducting fatigue tests. Finally, weldable joints were melted by TIG method without adding filler metal. The angle and radius of welds nobs entrance into the native material was measured. The increase of fatigue strength is related to the decrease of geometric notch on the edges of weld nobs.
Źródło:
Journal of KONES; 2016, 23, 4; 63-69
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the applicability of high strength steel of YS = 1300 MPa in the marine industry
Autorzy:
Czechowski, M.
Mniecznikowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/245827.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
high strength steel
martensitic steel
welding
Opis:
The paper shows the results of non-destructive and destructive tests carried out on high strength martensitic steel – Weldox 1300. It is used for the construction of crane lorries, mining equipment and submarines. During testing a test joint of the following dimensions was used: length – 600 mm, width – 300 mm, and thickness – 9.5 mm. Welding was executed using flux-cored wire Union x90. The results obtained in the following tests were analysed: nondestructive tests, tensile and bend test, impact test, hardness test, and macrotexture test. Non-destructive testing: visual, magnetic particle and ultrasonic inspections showed no irregularities. The material met the acceptance requirements. The results of the tensile test of the examined steel amounted to 1047 MPa on average. The samples were broken in the weld. During root bend and tensile test the specimen was bent up to the 180° angle during which no welding discontinuities were observed. During face bend and tensile test, the sample was bent to the angle of approx. 40°– visible cracks. Rupture of the sample in the weld and cracks created when bending are due to the reduced flow stress of the additional material against the tested steel. Energy of the impact test for specimens notched in the weld was 37.9 [J], and for specimens notched in the heat affected zone was 41.5 [J]. The average hardness of the specimen was determined at the level of 317 HV. Macroscopic testing did not show any delamination or welding discontinuations. In addition, strength tests of the base material were carried out. The results were compared with the product certificate provided by the steel manufacturer. The paper presents the results of tests, which can be used during factory production control of high strength steel.
Źródło:
Journal of KONES; 2016, 23, 3; 79-84
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilatometric Study of High Strength Steels Hardenability
Autorzy:
Di Schino, A.
Powiązania:
https://bibliotekanauki.pl/articles/351965.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high strength steel
quenching
hardenability
microstructure
Opis:
The effect of low-alloy additions on low-C steels hardenability is reported. Various as-quenched materials with microstructures consisting of low-C (granular) bainitic (B), mixed bainitic (B)/martensitic (M) and fully martensitic microstructures were produced. Results show that for a given cooling rate, an increase of austenite grain size (AGS) and of Mo and Cr contents decreases the transformation temperatures and promotes martensite formation.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 457-460
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The fatigue strength evaluation of S540Q steel and its welded joints
Autorzy:
Cicholska, M.
Powiązania:
https://bibliotekanauki.pl/articles/245662.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
weldability
fatigue strength
weldable steels of high strength
Opis:
The research deals with the examination of thermally hardened sheets of weldable S540Q steel of high strength, obtained by thermo mechanical treatment. Conventional rolling and controlled rolling with rapid cooling processes were compared. Example of technological process of high strength sheets production was presented. The basic mechanical properties of this steel were determined (static tensile tests results as well as technological bend tests results were given). Then the steel sheets were welded by a semi-automatic MAG method. The research on the quality of welded joints was performed and their suitability for further research was worked out. Mechanical properties of S540Q steel welded joints were elaborated. The mechanical properties of native material were compared to the properties of welded joints. Joints microstructure was examined in the joints axis, in heat-affected zone and in native material. Fatigue tests were conducted in the non-symmetric tension - compression cycle for the welded joints. The computational fatigue strength was determined and then compared to fatigue strength of the welded joints. The tests results were elaborated statistically by the analysis of linear regression. Wöhler charts were made after conducting fatigue tests. The analysis of increasing the fatigue strength of S540Q steel welded joints was also performed.
Źródło:
Journal of KONES; 2014, 21, 4; 37-42
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Phenomenon of Hydrogen Embrittlement in High-Strength Bolts
Autorzy:
Dubiel, Tomasz
Balawender, Tadeusz
Osetek, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/2203713.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cold forging
hydrogen embrittlement
high-strength bolts
Opis:
The hydrogen embrittlement of metals is caused by the penetration and accumulation of hydrogen atoms inside the metal. The failure of the product due to hydrogen embrittlement is delayed in time and does not occur immediately after its manufacture, but several hours, days, or even weeks later. Therefore, the chances of detecting hydrogen embrittlement when checking the quality of the finished product are very slim. The use of high-strength bolts in industry is associated with the risk of hydrogen embrittlement. This phenomenon poses a threat to the safe use of devices by limiting or completely losing the functionality of the bolt joint. Even a low influence of moisture can trigger failure mechanisms. The article proposes a method for assessing the risk of hydrogen embrittlement for high-strength bolts in class12.9. For this purpose, bolts made of material grade 32CrB4 were prepared and in a controlled manner the grain flow inconsistency was made, leading in extreme cases to the production of the forging lap. To perform the study, the device proposed by the European Assessment Document (EAD) was adapted to the testing of hydrogen embrittlement of threaded fasteners in concrete. The concrete substrate was replaced with metal spacers that were preloaded with a bolt. The use of the wedge distance under the bolt head led to the generation of two stress states - tensile and compressive, which translated into an increased risk of hydrogen embrittlement. After being tested, the bolts were visually and microscopically inspected to assess potential locations for cracks and hydrogen propagation. As a result of the conducted tests, it was found that the prepared test method allows to assess the resistance or susceptibility of the bolt to threats related to hydrogen embrittlement.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 395--402
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Structural Steel Containing 3÷5 wt% Al with Microlaminated Microstructure
Autorzy:
Garbarz, B.
Adamczyk, M.
Niżnik-Harańczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/351953.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high strength steel
alloying with aluminium
microlaminated microstructure
Opis:
The aim of this work was to develop basic parameters of hot rolling and controlled cooling technology allowing to obtain the microlaminated (lamellar) microstructure in a lean-alloy structural steel containing 3÷5 wt % Al. Thermo-mechanical rolling tests of two experimental steels were carried out in a semi-industrial line comprising a one – stand reversing rolling mill. The final microstructure of the specimens subjected to rolling in the γ + α stability region characterised with the microlaminated morphology composed of lamellae of ferrite with thickness down to 1 μm or less and lamellae or grains of phases developed during transformation of the austenite. Determined parameters of the thermo-mechanical processing allowed to achieve very attractive mechanical properties of the experimental steels: tensile strength over 1.0 GPa and ductility level (total elongation) better than 15%.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2309-2315
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of microstructure of resistance spot-welded joints made of HSLA340 and DP600 steels
Badanie mikrostruktury złączy zgrzewanych punktowo ze stali HSLA340 I DP600
Autorzy:
Ignasiak, A.
Korzeniowski, M.
Ambroziak, A.
Powiązania:
https://bibliotekanauki.pl/articles/356179.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resistance spot welding
high-strength steel
metallographic examination
Opis:
The paper presents results of metallographic investigations of spot welds made of high-strength steel HSLA340 and dual-phase DP600 steel. Low-carbon martensite microstructure was found in the weld nugget of HSLA steel. The DP600 steel shows martensite and bainite microstructure. For both steels, no carbides of microadditives were found because they dissolved in liquid nugget and could not precipitate again because of rapid heat abstraction. Moreover, no transcrystallisation was found in both steels, which proves good mixing of the materials within the weld.
W artykule opisano wyniki badań metalograficznych zgrzein punktowych wykonanych ze stali o podwyższonej wytrzymałości HSLA340 i dwufazowej stali DP600. Badania wykazały, ze jądro zgrzeiny dla stali HSLA ma mikrostrukture martenzytu niskowęglowego, a dla stali DP600 martenzytu i bainitu. Dla obu gatunków stali w zgrzeinie nie obserwowano węglików mikrododatków stopowych, gdyż w czasie tworzenia ciekłego jądra zostały one rozpuszczone, a w wyniku szybkiego odprowadzania ciepła do elektrod nie zdołały sie ponownie wydzielić. Ponadto dla obu gatunków stali zaobserwowano brak transkrystalizacji, co świadczy o dobrym wymieszaniu sie materiałów w obrebie zgrzeiny.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 4; 1081-1086
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of treating welded joints edges on the strength and fatigue of S640Q steel
Autorzy:
Cicholska, M.
Powiązania:
https://bibliotekanauki.pl/articles/246584.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
weldability
high strength weldable steel
thermomechanical treatment
increasing fatigue strength
fatigue strength
Opis:
Weldable steels of high strength were discussed. The factors influencing the achievement of low grain structure that ensures high strength of these steels was explained. Traditional and modern methods of producing high strength steel were shown. The scheme of production line was shown, the line which is used to manufacture steel of high strength in thermomechanical way. The methods of achieving strength to fatigue used for welded joints were presented. The factors influencing the increase of strength to fatigue of welded joints were elaborated. The thermally hardened steel sheets of high strength weldable S640Q steel underwent research. Basic mechanical properties of this steel were indicated. The results of static tensile test and technological bend test were given. Then the sheets were welded by semiautomatic MAG method. The examinations of welds quality were conducted and their usefulness for further tests was stated. Mechanical properties of welded joints were determined. The mechanical properties of native material and welded joints were compared. The microstructure of welded joints in the weld axis, in heat influence zone as well as in native material was examined. Fatigue tests in a non-symmetrical cycle of lengthening – compressing for the welded joints were carried out. The computational strength to fatigue was determined and compared with fatigue strength of welded joints. Tests results were elaborated by the statistical analysis of linear regression. After conducting fatigue tests, the Wöhler diagrams were made. Afterwards, the joints welded with TIG method, were penetrated without adding filler metal. The results were presented for the fatigue tests as well as the Wohler graph for welded joints after penetration of the joints edges with TIG method without adding filler metal. The results were compared.
Źródło:
Journal of KONES; 2017, 24, 2; 59-64
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bead-on-Plate Underwater Wet Welding on S700MC Steel
Autorzy:
Tomków, Jacek
Świerczyńska, Aleksandra
Landowski, Michał
Wolski, Adrian
Rogalski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2023305.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
MMA welding
high-strength steel
underwater wet welding
covered electrode
Opis:
The participation of high strength steels in marine and offshore structures is increasing, which makes it necessary to develop recommendations for underwater repair welding works. The article presents the results of bead-on-plate welded specimens made of S700MC high strength steel in underwater wet welding conditions by covered electrodes. Three specimens with heat input values in the range 0.91-1.05 kJ/mm were made. The specimens were subjected to visual, metallographic, macro- and microscopic tests as well as hardness measurements using the Vickers method. It was found that the higher heat input leads to formation of mixed bainite-martensite microstructure in the heat-affected zone (HAZ). Lower heat input value results in presence of martensite in HAZ. It was shown that in the scope of the performed tests, the maximum hardness of HAZ did not exceed the critical value for the material group, and the increase in heat input caused the decrease of hardness by about 25 HV10.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 288-296
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
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:
Microstructural Characterization and Mechanical Properties of Electron Beam Welded Joint of High Strength Steel Grade S690QL
Autorzy:
Błacha, S.
Węglowski, M. S.
Dymek, S.
Kopuściański, M.
Powiązania:
https://bibliotekanauki.pl/articles/354148.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electron beam welding
high strength quenched and tempered steel
microstructure
Opis:
In the paper the results of metallographic examination and mechanical properties of electron beam welded joint of quenched and tempered steel grade S690QL are presented. Metallographic examination revealed that the concentrated electron beam significantly affect the changes of microstructure in the steel. Parent material as a delivered condition (quenched and tempered) had a bainitic-martensitic microstructure at hardness about 290 HV0.5. After welding, the microstructure of heat affected zone is composed mainly of martensite (in the vicinity of the fusion line) of hardness 420 HV0.5. It should be noted, however, that the microstructure of steel in the heat affected zone varies with the distance from the fusion line. The observed microstructural changes were in accordance with the CCT-S transformation diagram for the examined steel.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1193-1200
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties and Structure of X30MnAlSi26-4-3 High Strength Steel Subjected to Dynamic Compression Processes
Autorzy:
Śmiglewicz, A.
Jabłońska, M.
Moćko, W.
Kowalczyk, K.
Hadasik, E.
Powiązania:
https://bibliotekanauki.pl/articles/355215.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high strength steel
dynamic compression
split Hopkinson bar
share bands
Opis:
The paper presents the results of investigation on X30MnAlSi26-4-3 austenitic steel subjected to dynamic compression using the split Hopkinson pressure bar. The strain rate was 3700 s-1. The compression test was also carried out without the use of breaking rings and then true strain was about 0.3. The split Hopkinson pressure bar test take only few milliseconds to complete during which time it is impossible to transfer the excess heat out of the specimen, therefore the test must be carried out in adiabatic conditions and so the increase of the temperature caused by the work of plastic deformation had to be calculated. The stepping load method was used in order to evaluate the effect of adiabatic heating on the properties of steel which allowed to maintain the isothermal deformation conditions. The paper presents the comparison of results obtained during deformation under adiabatic and isothermal conditions in correlation to structure changes occurring in course of dynamic compression.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2255-2260
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of strength of the welded joints by using of the aramis video system
Autorzy:
Pała, T.
Dzioba, I.
Gałkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/386835.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
high-strength steel
laser welded joints
tensile properties
fracture toughness
Opis:
In the paper are presented the results of strength analysis for the two types of the welded joints made according to conventional and laser technologies of high-strength steel S960QC. The hardness distributions, tensile properties and fracture toughness were determined for the weld material and heat affect zone material for both types of the welded joints. Tests results shown on advantage the laser welded joints in comparison to the convention ones. Tensile properties and fracture toughness in all areas of the laser joints have a higher level than in the conventional one. The heat affect zone of the conventional welded joints is a weakness area, where the tensile properties are lower in comparison to the base material. Verification of the tensile tests, which carried out by using the Aramis video system, confirmed this assumption. The highest level of strains was observed in HAZ material and the destruction process occurred also in HAZ of the conventional welded joint.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 1; 9-13
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Welding Thermal Cycles on Microstructure and Mechanical Properties of Simulated Heat Affected Zone for a Weldox 1300 Ultra-High Strength Alloy Steel
Autorzy:
Węglowski, M. St.
Zeman, M.
Grocholewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/355256.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultra-high strength steel
weldability
Weldox 1300 steel
physical simulation
Opis:
In the present study, the investigation of weldability of ultra-high strength steel has been presented. The thermal simulated samples were used to investigate the effect of welding cooling time t8/5 on microstructure and mechanical properties of heat affected zone (HAZ) for a Weldox 1300 ultra-high strength steel. In the frame of these investigation the microstructure was studied by light and transmission electron microscopies. Mechanical properties of parent material were analysed by tensile, impact and hardness tests. In details the influence of cooling time in the range of 2,5 ÷ 300 sec. on hardness, impact toughness and microstructure of simulated HAZ was studied by using welding thermal simulation test. The microstructure of ultra-high strength steel is mainly composed of tempered martensite. The results show that the impact toughness and hardness decrease with increase of t8/5 under condition of a single thermal cycle in simulated HAZ. The increase of cooling time to 300 s causes that the microstructure consists of ferrite and bainite mixture. Lower hardness, for t8/5 ≥ 60 s indicated that low risk of cold cracking in HAZ for longer cooling time, exists.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 127-132
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the DRECE Process of Severe Plastic Deformation on the Mechanical Properties of the Ultra-Low Carbon Interstitial Free Steel
Autorzy:
Kowalczyk, K.
Jabłońska, M.
Rusz, S.
Bednarczyk, I.
Powiązania:
https://bibliotekanauki.pl/articles/352805.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sheet metal
high strength steel
interstitial free steel
SPD process
Opis:
This research paper shows the influence of a repeated SPD (Severe Plastic Deformation) plastic forming with the DRECE technique (Dual Rolls Equal Channel Extrusion) on hardening of low carbon IF steel. The influence of number of passes through the device on change of mechanical properties, such as tensile strength TS and yield stress YS, of tested steel was tested. The developed method is based on equal channel extrusion with dual rolls and uses a repeated plastic forming to refinement of structure and improve mechanical properties of metal bands [1-2]. For the tested steel the increase of strength properties after the DRECE process was confirmed after the first pass in relation to the initial material. The biggest strain hardening is observed after the fourth pass.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2095-2100
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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