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The Effects of Travel Speed of Tungsten Inert Gas Cladding of Tungsten Carbide and Nickel Composites on the Microstructure of Stainless Steel

Oleiwi Aws Ali, Jilabi Abdul Sameea Jasim

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 4

177--190

he scientific and industrial communities now consider surface modification of steel-based alloys to be essential. One effective method of altering these alloys' surfaces is tungsten inert gas (TIG) cladding.The purpose of this study is to investigate how the surface characteristics of austenitic stainless steel substrates are affected by TIG-deposited composite coatings made of tungsten carbide and nickel (WC-Ni). The study also intends to investigate the influence of the WC-Ni composite coatings' travel speed, and as a result, the heat input usually has significant effects on the microstructure. The coating layers were deposited at different travel speeds (67, 107, and 122 mm/min) using pre-placed composite pastes that were 1 mm thick and contained the same weight percentage of WC (65). The clad layers showed a variety of microstructures in optical and scanning electron microscopy, primarily nickel solid solution dendrites with WC particles scattered throughout the matrix. The dendrites at various locations across the clad layers were few or dense, finer or coarser, equiaxial or columnar, densely or less densely branched, depending on the cooling rates and the density of WC in the composite. Energy dispersive spectroscopy demonstrated that the Fe element that was transferred from the substrate material to the molten pool was primarily concentrated in the matrix, not the dendrites, while the dendrite locations and orientations were amply demonstrated by the distribution of the W element.

Influence of laser and TIG cladding methods on microstructure morphology and hardness of Stellite 694 overlay deposited onto DS200+Hf alloy substrate

Gancarczyk Natalia, Gradzik Andrzej, Kościelniak Barbara, Gancarczyk Kamil, Góral Marek

Mechanik

2023

R. 96, nr 7

26--34

In this paper the influence of cladding method - laser and TIG - on microstructure and properties of Stellite 694 coatings deposited onto DS200+Hf nickel based alloy substrate is presented. Manual TIG cladding process were carried out using LORCH V24 DC, laser cladding process was carried out using Yb:YAG, TruDisk 1000 TRUMPF. Cobalt alloy - Stellite 694 was used as a filler material. Effect of different cladding methods was examined based on chemical composition and microstructure analysis as well as hardness measurements of the deposited layers.

W niniejszej pracy prowadzono ocenę morfologii składników fazowych mikrostruktury i właściwości warstwy ochronnej Stellite 694 na podłożu z żarowytrzymałego nadstopu niklu DS200+Hf, wytworzonej w procesach napawania elektrycznego (TIG) i laserowego. Napawanie elektryczne metodą TIG przeprowadzono z użyciem spawarki LORCH V24 DC, natomiast laserowe - za pomocą lasera dyskowego Yb:YAG, TruDisk 1000 firmy TRUMPF. Materiałem dodatkowym był stop kobaltu Stellite 694. Określono stopień oddziaływania źródła ciepła i warunków procesu na skład chemiczny napoiny, jej mikrostrukturę oraz twardość w mikroobszarach.

Influence of austenitic interlayer on the properties of stellite padding welds after impact-hardening

Henzler Weronika, Sawa Mateusz, Trębicki Przemysław, Szala Mirosław, Winiarski Grzegorz

Welding Technology Review

2021

R. 93, nr 2

13--20

Stellites (Co-Cr-W-C) are the specific group of coating materials used for surface modification of the engineering materials and for remanufacturing. The aim of the paper was to research the influence of austenitic (308LSi) interlayer on hardening rate of stellite 1 and stellite 6 after impact hardening. The samples have been cladded by TIG welding method with interlayer and without. Before impact hardening the samples have been visually and penetrant non-destructive tested. The samples after impact hardening have been tested by metallographic and Vickers hardness methods. The highest impact hardening effect have been revealed for coatings deposited with interlayer. The highest impact hardening effect was achieved for the padding welds produced with the interlayer, i.e. for stellite 1 (increased by 29.8%) and stellite 6 (increased by 42.7%). The hardening of the coating samples deposited without interlayer was lower and amounted to stellite 1 (increased by 13.7%) and stellite 6 (increased by 29.8%) respectively. The highest hardness values were obtained for impact-hardened cladded welds without the use of an interlayer (stellite 1; 790 HV0.1 and stellite 6; 732 HV0.1). The use of an interlayer reduces the hardness of the stellite coating while increasing the susceptibility to hardening and plastic deformation of the produced coating.

Stellity (Co-Cr-W-C) stanowią grupę materiałów stosowanych do napawania produkcyjnego i regeneracyjnego. Celem pracy było zbadanie wpływu międzywarstwy austenitycznej (308LSi) na stopień umocnienia się napoin stellitowych (stellit 1 i stellit 6), poddanych działaniu obciążeń udarowych. Próbki napawano metodą TIG z zastosowaniem międzywarstwy oraz bez udziału międzywarstwy. Po przeprowadzeniu badań wizualnych i penetracyjnych próbki zostały poddane utwardzeniu udarowemu. Wykonano badania metalograficzne oraz badania mikrotwardości sposobem Vickersa. Największe utwardzenie udarowe uzyskano dla napoin wytworzonych z międzywarstwą, tj. dla stellitu 1: 29.8% i stellitu 6: 42.7%. Utwardzenie próbek napawanych bez międzywarstwy było niższe i wynosiło kolejno dla stellitu 1: 13.7% i stellitu 6: 29.8%. Najwyższe wartości twardości uzyskano dla napoin utwardzanych udarowo bez zastosowania międzywarstwy (stellit 1; 790 HV0,1 i stellit 6; 732 HV0,1). Zastosowanie międzywarstwy obniża mikrotwardość powłoki stellitowej jednocześnie zwiększając podatność do umocnienia i odkształcenia plastycznego wytworzonej powłoki.