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Dwumiesięcznik ISSN 0208-6247, e-ISSN 2449-9889 - rok powstania: 1980
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Characterization of the Cr3C2-NiAl coatings on sintered duplex stainless steels
(ang. Charakterystyka powłoki Cr3C2-NiAl na spiekanych stalach duplex)

DOI:10.15199/28.2018.3.2
Barbara Lisiecka Agata Dudek

Streszczenie
The main method for production of structural materials from metallic powders with addition or without addition of non-metallic powders is powder metallurgy (PM). This method is based on forming and sintering processes. The PM method consists of a small number of process steps and insignificant energy consumption, which allows to production of complex shape components, with great precision in dimensions and surface quality. Taking into account the above advantages, interest in sintered duplex stainless steels (SDSSs) is growing, which are characterized by two-phase microstructure consisting of ferrite and austenite. Such combination of properties makes the SDSS a very attractive material for numerous applications. As is well known, the chromium carbide coatings improve functional properties (e.g. hardness and wear resistance). The main purpose of this study was to examine the effect of chromium carbide coating on the properties of SDSSs. The multiphase sinters were prepared from two types of water-atomized steel powders: 316L and 409L. The technique of atmospheric plasma spraying (APS) was used to deposit Cr3C2–NiAl powder on SDSS surface. Additionally, it was carried out alloying the surface of the SDSS by gas tungsten arc welding (GTAW) process at current intensity 50 A. Light microscopy and scanning electron microscopy (SEM/EDS) were performed in order to determine the microstructure of SDSSs. The results of hardness and wear resistance measurements are also presented. The applied chromium carbide coatings cause hardening in SDSSs and modification of surface layer properties, such as coefficient of friction. Furthermore, the main assumption for this investigate was to analysis the microstructure and hardness of surface layer of SDSSs with different proportions of powders as a result the alloying process
Słowa kluczowe: sintered duplex stainless steels (SDSSs), chromium carbide coating, surface alloying, gas tungsten arc welding (GTAW).
Abstract
Powłoki z węglika chromu poprawiają właściwości funkcjonalne materiałów takie jak twardość i odporność na zużycie. Głównym celem pracy była analiza wpływu powłoki z węglika chromu oraz stopowanej warstwy wierzchniej na właściwości spiekanych stali nierdzewnych typu duplex (SDSSs). W celu wytworzenia powłoki z proszku Cr3C2–NiAl na powierzchni SDSS zastosowano natryskiwanie plazmowe w warunkach atmosferycznych (APS). Dodatkowo przeprowadzono stopowanie powierzchni SDSS łukową metodą spawalniczą GTAW przy natężeniu prądu o wartości 50 A. W celu określenia mikrostruktury SDSS wykonano badania za pomocą mikroskopii świetlnej i skaningowej mikroskopii elektronowej (SEM/EDS). Przeprowadzono analizę wyników pomiarów twardości i odporności na zużycie w powiązaniu z analizą mikrostruktury i warstwy powierzchniowej SDSS powstałej w wyniku procesu stopowania.
Keywords: spiekane stale duplex (SDSSs), powłoka Cr3C2–NiAl, stopowanie powierzchni, spawanie łukowe (GTAW).
The extremely interesting technology used for production of structural materials from metallic powders as a result of processes of forming and sintering is powder metallurgy (PM). This method allows to modify chemical composition in a very wide range which gives the possibility of production duplex steel with a varied microstructure [1, 2]. In the case of sintered duplex stainless steel (SDSS), it is possible to obtain a structure with different proportions of the basic structural components, i.e. austenite and ferrite. Taking into account high mechanical strengths, high toughness and good corrosion resistance, the SDSSs are used in industry, especially in highly industrialized countries [3÷6]. One of the most commonly used techniques to improve surface properties of steel are the coating processes or surface treatments [7, 8]. An interesting surface modification is the formation of coating based on chromium carbide. Chromium carbides have three polymorphic structures: the cubic (Cr23C6), the hexagonal (Cr7C3) and the orthorhombic (Cr3C2). In view of the best mechanical properties and appropriate adhesion to substrate, Cr3C2 is well-known chromium carbide [9, 10]. The chromium carbide coatings are widely used in high temperature applications (i.e. shaft bearings, seals, high-temperature furnaces, nozzles and metal machining moulds) because they present unique corrosion resistance and are characterized by higher hardness and strength than other carbides at such temperature. These coatings can be produced using electron beam physical vapour deposition (EB-PDV), atmospheric plasma spraying (APS) and high velocity oxy fuel (HVOF) [11÷13]. The method that enjoys unflagging interest is atmospheric plasma spraying (APS). In plasma spraying process, the powder (e.g. Cr3C2) is introduced into the plasma jet, which issue from a plasma torch. In the jet the powder is melted and propelled towards a substrate, where the formed a deposits [...]

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Bibliografia

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INŻYNIERIA MATERIAŁOWA

Characterization of the Cr3C2-NiAl coatings on sintered duplex stainless steels (ang. Charakterystyka powłoki Cr3C2-NiAl na spiekanych stalach duplex)

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INNE PUBLIKACJE W TYM ZESZYCIE

Characterization of the Cr3C2-NiAl coatings on sintered duplex stainless steels
(ang. Charakterystyka powłoki Cr3C2-NiAl na spiekanych stalach duplex)