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    Wyświetlanie 1-6 z 6
    Tytuł:
    Microstructure of Welded Joints of X5CrNiCuNb16-4 (17-4 PH) Martensitic Stainlees Steel After Heat Treatment
    Mikrostruktura złącz spawanych stali nierdzewnej martenzytycznej X5CrNiCuNb16-4 (17-4PH) po obróbce cieplnej
    Autorzy:
    Ziewiec, A.
    Zielińska-Lipiec, A.
    Tasak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355711.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    weld metal
    heat treatment
    martensitic PH stainless steels
    17-4PH steel
    spoiwa
    obróbka cieplna
    stale nierdzewne martenzytyczne PH
    stal 17-4 PH
    Opis:
    The paper presents rezults of microstructure (LM, TEM) investigation and hardness measurments of welded joints in martensitic precipitation hardened stainless steel containing copper, subjected to heat treatment. For the aging temperature up to 540°C even for the very long times, the microstructure of the welded joints is similar to this one at lower temerature aging. After aging at 620°C a distinct change of the microstructure was observed. Non-equilibrium solidification conditions of the weld metal, segregation and the diffusion of copper and the elements stablilizing the austenite cause the occurrence of the reverse transformation of the martensite into austenite as fast as just 1 hour at 620°C. TEM investigations revealed the differences in dispersion of hardening copper precipitates after aging at temperature 620°C for 1 and 4 hours.
    W artykule przedstawiono wyniki badań mikrostruktury (LM, TEM) oraz twardości złącz spawanych stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią po obróbce cieplnej. Aż do temperatury starzenia 540° C mikrostruktura spoin nie wykazuje istotnych różnic niezależnie od czasu wytrzymania w porównaniu do tej obserwowanej w niższych temperaturach. Po starzeniu w temperaturze 620°C zaobserwowano wyraźne różnice w mikrostrukturze spoin. Nierównowagowe warunki krzepnięcia metalu spoiny, występowanie segregacji oraz procesy dyfuzji miedzi i pierwiastków stabilizujących austenit powodują wystąpienie przemiany odwrotnej martenzytu w austenit już po 1 godzinie starzenia w 620°C. Badania TEM wykazały, różnice w dyspersji cząstek umacniających w temperaturze starzenia 620°C przez 1 i 4 godziny.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 965-970
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Parameters of Robotic TIG Welding on the Microstructure of 17-4PH Stainless Steel Welded Joint
    Autorzy:
    Nalborczyk-Kazanecka, Agnieszka
    Mrowka-Nowotnik, Grażyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2203752.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    welding
    17-4PH stainless steel
    precipitation hardening
    heat treatment
    Opis:
    17-4PH stainless steel finds application in the aerospace industry owing to its good mechanical properties and corrosion resistance. In the literature, this steel is described as good for welding, but research shows that it may be problematic due to the formation of defects. In this study, the welded joints were made by the robotic TIG welding method with various welding speeds (2 and 3 mm/s). The joints were subjected to non-destructive testing and were free from defects. The microstructure was observed by light microscopy and scanning electron microscopy. Changes in the microstructure of the heat affected zone were observed and discussed. Based on the observation of the microstructure and the change in the hardness profile, the heat affected zone was divided into 4 characteristic regions. δ-ferrite and NbC were observed in the martensite matrix. The welded joints were subjected to heat treatment consisting of solution and aging in 550°C for 4 h. The microstructure of the heat affected zone become homogenized as a result of the heat treatment. The content of stable austenite in the welded joint after the heat treatment was about 3%.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 339--344
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ageing heat treatment temperature on the properties of DMLS additive manufactured 17-4PH steel
    Autorzy:
    Świetlicki, Aleksander
    Wlaczak, Mariusz
    Szala, Mirosław
    Turek, Marcin
    Chocyk, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/27311463.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    17-4PH steel
    precipitation hardening
    additive manufacturing
    heat treatment
    nanohardness
    utwardzanie wydzieleniowe
    produkcja dodatkowa
    obróbka cieplna
    nanotwardość
    stal 17-4 PH
    Opis:
    Additive manufacturing (AM) is a modern, innovative manufacturing method that enables the production of fully dense products with high mechanical properties and complex shapes that are often impossible to obtain by traditional methods. The 17-4PH grade steel is often applied where high mechanical performance is required. 17-4PH, or AISI 630, is intended for precipitation hardening, an operation that combines solution and ageing treatments and is used to significantly change the microstructure of the steel and enhance its mechanical properties. This study investigates the effect of precipitation hardening on the properties of 17-4PH steel. To examine microstructure and morphology, metallographic tests were performed together with phase composition and chemical composition analyses. Mechanical parameters were determined via Vickers hardness testing and the Oliver-Pharr method. Samples were fabricated using direct metal laser sintering (DMLS), which is one of the powder bed fusion methods. The use of a constant solution treatment temperature of 1040_C and different ageing temperatures made it possible to evaluate the effects of ageing temperature on the mechanical properties and microstructure of 17-4PH. The presence of face-centered cubic FCC g-austenite and body-centerd cubic BCC a-martensite structures were detected. The tests revealed that – similarly to the wrought material – the highest hardness of 382_10:3 HV0:2 was obtained after ageing at 450_C. The nanoindentation test showed the same H/E ratio for the sample after fabrication and after solution treatment at 0.016769, but this value increased after ageing to 127–157.5%. The sample aged at 450_C was characterized by the highest H/E ratio of 0.026367, which indicates the highest wear resistance of this material under employed treatment conditions. In general, the sample treated at 450_C showed the best performance out of all tested samples, proving to have the smallest grain size as well as high Vickers and nanoindentation hardness. On the other hand, the use of solution treatment led to reduced hardness and improved workability of the AM material.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e146237
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study on the influence of printing orientation in metal printing using material extrusion technology on the mechanical properties of 17-4 stainless steel products
    Autorzy:
    Dang, Long Cao
    Nguyen, Cuong Van
    Le, Anh Hoang
    Bui, Danh Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/28407327.pdf
    Data publikacji:
    2023
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    additive manufacturing
    material extrusion
    17-4 PH stainless steel
    mechanical properties
    Opis:
    This study investigated the influence of print orientation on the mechanical properties of 17-4 PH stainless steel parts fabricated using material extrusion technology. Tensile test specimens were 3D printed in different orientations (flat, on-edge, and upright), and their mechanical properties were evaluated. The results showed that the print orientation significantly affected the ultimate tensile strength, yield strength, and elongation at failure of the specimens. The flat and on-edge orientations exhibited similar mechanical properties, while the upright orientation resulted in lower strength and higher fracture susceptibility. Hardness measurements also indicated variations in hardness distribution among the orientations. The findings emphasize the importance of optimizing the print orientation parameter to achieve desired mechanical characteristics in 17-4 PH stainless steel parts.
    Źródło:
    Journal of Machine Engineering; 2023, 23, 4; 89--100
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of Products Made of 17-4PH Steel by means of 3D Printing Method
    Autorzy:
    Walczak, M.
    Gąska, D.
    Guzik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/118105.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    direct metal laser sintering
    3D printing
    17-4PH stainless steel
    Opis:
    The article presents the results of tests of 17-4PH steel fabricated by means of the method consisting in laser additive manufacturing (LAM) – direct metal laser sintering (DMLS). This grade of steel is characterized by excellent stress corrosion resistance in the first place and is applied as construction material in chemical, aircraft, medical or mould making industry. 3D metal printing is a relatively new method enabling significant change of structural properties of these materials at printing parameters predetermined by printers manufacturer for ”offline” printing mode. In order to achieve this goal, the authors have carried out the analysis of chemical composition, SEM tests and the tests of products surface rough-ness. Furthermore the products have been subjected to X-ray analysis by means of computed tomography (X-ray CT). Structural discontinuities have been found in upper layer and inside printouts subjected to tests.
    Źródło:
    Applied Computer Science; 2016, 12, 3; 29-36
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Welded joint cracking in martensitic stainless steel precipitation-sthregthened with copper
    Pękanie złącz spawanych stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią
    Autorzy:
    Ziewiec, A.
    Czech, J.
    Tasak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/356169.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    17-4PH grade
    Weldability Testing
    copper
    liquid metal embrittlement
    stainless steel
    GTAW
    fracture
    Opis:
    Problem of welded joint cracking in the HAZ of Cu strengthened 17-4PH grade precipitation hardening martensitic stainless steel is presented. Hypothesis concerning hydrogen embrittlement origin of the cracks is opposed. It was concluded that the cracks located in the high-temperature zone of the HAZ exhibit characteristics of hot cracks which originated as a result of steel embrittlement in the presence of Cu rich liquid phase. The mechanism of steel surface enrichment in Cu is proposed. Practical methods of cracks elimination are presented.
    W artykule przedstawiono problem pękania w strefie wpływu ciepła stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią. Podważono literaturowe informacje wskazując, ze sa to pęknięcia zimne spowodowane kruchością wodorowa. Stwierdzono, ze pęknięcia zlokalizowane w wysokotemperaturowym obszarze SWC maja charakter pęknięć gorących i powstały w wyniku kruchości stali w obecności cieczy bogatej w miedz. Wyjaśniono mechanizm wzbogacania się powierzchni stali w miedz oraz podano technologiczny sposób eliminacji pęknięć.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 4; 1055-1061
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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