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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Effect of the Diameter and Spacing Between Impurities on the Fatigue Strength Coefficient of Structural Steel
    Autorzy:
    Lipiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/352827.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steel
    structural steel
    non-metallic inclusions
    oxide impurities
    fatigue strength coefficient
    bending fatigue
    Opis:
    The article discusses the effect of the diameter and spacing between impurities (size up to 2 μm) on the fatigue strength coefficient of structural steel during rotary bending. The study was performed on 21 heats produced in an industrial plant. Fourteen heats were produced in 140 ton electric furnaces, and 7 heats were performed in a 100 ton oxygen converter. All heats were desulfurized. Seven heats from electrical furnaces were refined with argon, and heats from the converter were subjected to vacuum circulation degassing. Steel sections with a diameter of 18 mm were hardened for 30 minutes from the austenitizing temperature of 880°C and tempered at a temperature of 200, 300, 400, 500 and 600°C. The experimental variants were compared in view of the applied melting technology and heat treatment options. The results were presented graphically and mathematically to account for the correlations between the fatigue strength coefficient during rotary bending, the diameter of and spacing between submicroscopic impurities. Equations for calculating the fatigue strength coefficient at each tempering temperature and a general equation for all tempering temperatures were proposed. Equations for estimating the fatigue strength coefficient based on the relative volume of submicroscopic non-metallic inclusions were also presented. The relationship between the fatigue strength and hardness of highgrade steel vs. the quotient of the diameter of impurities and the spacing between impurities, and the fatigue strength and hardness of steel vs. the relative volume of submicroscopic non-metallic impurities were determined.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 519-524
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending fatigue strength coefficient the low carbon steel with impurities
    Autorzy:
    Lipiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/111958.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    bending fatigue
    steel
    structural steel
    non-metallic inclusions
    oxide impurities
    fatigue strength
    stal
    stal konstrukcyjna
    wtrącenia niemetaliczne
    wytrzymałość zmęczeniowa
    Opis:
    The article discusses the results of a study investigating the effect of the number of fine non-metallic inclusions (up to 2 μm in size) on the fatigue strength of structural steel during rotary bending. The study was performed on 7 heats produced in an industrial plant. Fourteen heats were produced in a 100 ton oxygen converter. All heats were subjected to vacuum circulation degassing. Steel sections with a diameter of 18 mm were hardened and tempered at a temperature of 200, 300, 400, 500 and 600°C. The experimental variants were compared in view of the applied melting technology and heat treatment options. The heat treatments were selected to produce heats with different microstructure of steel, from hard microstructure of tempered martensite, through sorbitol to the ductile microstructure of spheroidite. The results were presented graphically, and the fatigue strength of steel with a varied share of non-metallic inclusions was determined during rotary bending. The results revealed that fatigue strength is determined by the relative volume of fine non-metallic inclusions and tempering temperature.
    Źródło:
    Production Engineering Archives; 2018, 21; 20-23
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of impurity spaces as a percentage volume of non-metallic inclusions
    Autorzy:
    Lipiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/111916.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    steel
    structural steels
    non-metallic inclusions
    oxide impurities
    fatigue strength
    bending fatigue
    stal konstrukcyjna
    wtrącenia niemetaliczne
    zanieczyszczenia tlenkowe
    wytrzymałość zmęczeniowa
    Opis:
    The parameters of high-grade steel are influenced by a combination of factors, including chemical composition and production technology. The impurity content is also a key determinant of the quality of high-grade steel. Non-metallic inclusions are one of the factors that influence the properties, in particular fatigue strength of steel. The physical and chemical reactions that occur in the process of steel melting and solidification produce non-metallic compounds and phases, referred to as inclusions. The quantity of non-metallic inclusions is correlated with the content of dopants in the alloy, while their phase composition and structure, in particular shape, dimensions and dispersion, impurity spaces are determined by the course of metallurgical processes. The experimental material consisted of semi-finished products of medium-carbon structural steel. The production process involved three melting technologies: steel melting in a basic arc furnace with: desulfurization or desulfurization and argon refining and in an oxygen converter and next subjected to vacuum circulation degassing. Billet samples were collected to analyze the content of non-metallic inclusions with the use of an optical microscope and a video inspection microscope. The application of various heat treatment parameters led to the formation of different microstructures responsible for steel hardness values. The objective of this study was to determine the influence of percentage volume non-metallic inclusions on impurity spaces.
    Źródło:
    Production Engineering Archives; 2015, 9, 4; 10-12
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of inclusions on bending fatigue strength coefficient the medium carbon steel melted in an electric furnace
    Autorzy:
    Lipiński, Tomasz
    Wach, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1839515.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    structural steel
    non-metallic inclusions
    oxide impurities
    fatigue strength
    bending fatigue
    stal konstrukcyjna
    wtrącenia niemetaliczne
    zanieczyszczenia tlenkowe
    wytrzymałość zmęczeniowa
    zmęczenie zginające
    Opis:
    The parameters of high-grade steel are influenced by a combination of factors, including chemical composition and production technology. The impurity content is also a key determinant of the quality of high-grade steel. Inclusions may also play an important role, subject to their type and shape. Inclusions may increase the strength of steel by inhibiting the development of micro-cracks. The analyzed material was one grade of medium-carbon structural steel. The study was performed on 6 heats produced in an industrial plant in 140 ton electric furnaces. The experimental variants were compared in view of the five heat treatment options. The results were presented to account for the correlations between the fatigue strength coefficient during rotary bending, the diameter of and spacing between impurities. The relationship between the fatigue strength and hardness of highgrade steel vs. the quotient of the diameter of impurities and the spacing between impurities was determined. The proposed equations contribute to the existing knowledge base of practices impact of impurities with various diameters and spacing between non-metallic inclusion on fatigue strength.
    Źródło:
    Production Engineering Archives; 2020, 26, 3; 88-91
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending fatigue strength of steel with impurities range over 2 μm
    Autorzy:
    Lipiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/112068.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    steel
    structural steel
    non-metallic inclusions
    oxide impurities
    fatigue strength
    bending fatigue
    stal
    stal konstrukcyjna
    wtrącenia niemetaliczne
    zanieczyszczenia tlenkowe
    wytrzymałość zmęczeniowa
    zginanie
    Opis:
    The parameters of high-grade steel are influenced by a combination of factors, including chemical composition and production technology. The impurity content is also a key determinant of the quality of high-grade steel. Non-metallic inclusions are one of the factors that influence the properties in particular fatigue strength of steel. The experimental material consisted of semi-finished products of medium-carbon structural steel. The production process involved three melting technologies: steel melting in a basic arc furnace with desulfurization or desulfurization and argon refining and in a oxygen converter and the next subjected to vacuum circulation degassing. This paper discusses the results of microstructural analyses, the changes in bending fatigue strength of steel hardened and tempered at different temperatures subjected to the size proportions and distances between the impurities of structural steel.
    Źródło:
    Production Engineering Archives; 2016, 11, 2; 26-30
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect Of The Spacing Between Submicroscopic Oxide Impurities On The Fatigue Strength Of Structural Steel
    Wpływ odległości pomiędzy submikroskopowymi zanieczyszczeniami tlenkowymi na wytrzymałość zmęczeniową stali konstrukcyjnej
    Autorzy:
    Lipiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/353296.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steel
    structural steel
    non-metallic inclusions
    fatigue strength
    oxide impurities
    fatigue resistance coefficient
    bending fatigue
    bending pendulum
    stal
    stal konstrukcyjna
    wtrącenia niemetaliczne
    wytrzymałość na zmęczenie
    zanieczyszczenia tlenkowe
    wskaźnik odporności na zmęczenie
    zginanie obrotowe
    Opis:
    The article discusses the effect of distance between submicroscopic oxide impurities (up to 2 μm in size) on the fatigue resistance coefficient of structural steel during rotary bending. The study was performed on 21 heats produced in an industrial plant. Fourteen heats were produced in 140 ton electric furnaces, and 7 heats were performed in a 100 ton oxygen converter. All heats were desulfurized. Furthermore seven heats from electrical furnaces were refined with argon, and heats from the converter were subjected to vacuum circulation degassing. Steel sections with a diameter of 18 mm were hardened from austenitizing by 30 minutes in temperature 880°C and tempered at a temperature of 200, 300, 400, 500 and 600°C. The experimental variants were compared in view of the applied melting technology and heat treatment options. The results were presented graphically and mathematically. The fatigue resistance coefficient of structural steel with the effect of spacing between submicroscopic oxide impurities was determined during rotary bending. The results revealed that fatigue resistance coefficient k is determined by the distance between submicroscopic non-metallic inclusions and tempering temperature.
    W pracy przedstawiono wyniki badań wpływu odległości pomiędzy submikroskopowymi zanieczyszczeniami tlenkowymi, o wielkości do 2 μm, na wskaźnik odporności na zmęczenie stali konstrukcyjnej przy zginaniu obrotowym. Badania prowadzono na 21 wytopach wyprodukowanych w warunkach przemysłowych. 14 wytopów wykonano w piecach elektrycznych o pojemności 140 ton i 7 wytopów w konwertorze tlenowym o pojemności 100 ton. Wszystkie wytopy poddawano odsiarczaniu. Dodatkowo 7 wytopów pochodzących z pieca elektrycznego poddawano rafinacji argonem, zaś wytopy z konwertora odgazowaniu próżniowemu. Odcinki ze stali o średnicy 18 mm hartowano po austenityzowaniu w czasie 30 minut z temperatury 880°C i odpuszczano w temperaturach: 200, 300, 400, 500 lub 600°C. Warianty badań zestawiono uwzględniając technologię wytapiania stali opcje obróbki cieplnej. Wyniki przedstawiono w graficznej i matematycznej postaci uwzględniającej zależności wskaźnik odporności na zmęczenie przy obrotowym zginaniu z odległości pomiędzy submikroskopowymi zanieczyszczeniami. Wykazano, że wskaźnik odporności na zmęczenie k zależy od odległości pomiędzy submikroskopowymi wtrąceniami niemetalicznymi, oraz temperatury odpuszczania.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3; 2385-2390
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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