Cobalt-based superalloy layers deposited on X38CrMoV5 steel base metal by explosion cladding process
TypeArticles dans des revues avec comité de lecture
A grade 25 cobalt-based superalloy in the form of a sheet 5 mm in thickness and a steel substrate of type X38CrMoV5 are joined by explosion cladding. The macrostructure and microstructure of the interface and of the co-based superalloy layers are studied. The interface presents the form of wavelets with a period of 1000 µm and an amplitude of 250 µm. The superalloy grains are deformed during the cladding process with several slip systems appearing. Near to the interface, the superalloy grains elongate and tend to follow the geometry of the interface. Observation with a scanning electron microscope (SEM) reveals zones of localised fusion at the interface. The EDS analysis shows that these fusion zones are the result of mixing between the base and cladding plates. Radiocrystallographic analysis by X-ray diffraction reveals the presence of the f.c.c cobalt in the cobalt-based superalloy layer. Thus cobalt retains its crystallographic structure (f.c.c) after cladding process. Hardness is evaluated with reference to microstructure. Near the interface, the hardness of the superalloy is of the order of 600 HV1 kg. In the remainder of the thickness, hardness is of the order of 500 HV1 kg, being greater than that of the unplated superalloy (270 HV1 kg). The track obtained by an indentation test at the interface under a load of 100 kg exhibits no cracking. This tends to prove the good metallurgical bond at the interface.
Files in this item
Showing items related by title, author, creator and subject.
GU, Guochao; PESCI, Raphaël; LANGLOIS, Laurent; BECKER, Eric; BIGOT, Régis (Elsevier, 2015)The microstructure investigation and flow behavior during thixoforging of M2 steel parts were investigated. Partial remelting was performed at processing temperatures ranging from 1290 ◦C to 1340 ◦C corresponding to a ...
GUTIERREZ, Catalina; MANGIN, Philippe; LANGLOIS, Laurent; BIGOT, Régis (Trans Tech Publications inc., 2014)Till now, the definition of cross wedge rolling dies requires know-how and important expertise from the designers. A decision-making methodology is being developed to provide sequential and logical steps to draw easier and ...
JEMAL, Nejah; LANGLOIS, Laurent; ZIMMER-CHEVRET, Sandra; HATSCH, Jonathan; ABBA, Gabriel; BIGOT, Régis (2013)Friction Stir Welding (FSW) est considéré comme un procédé de soudage à l’état solide très demandé pour souder des alliages d'aluminium. Au cours des dernières années, les chercheurs se sont orientés vers l’industrialisation ...
ZIMMER-CHEVRET, Sandra; LANGLOIS, Laurent; LAYE, Julien; GOUSSAIN, Jean-Claude; MARTIN, Patrick; BIGOT, Régis (2010)This paper presents an experimental methodology to determine a Friction Stir Welding (FSW) means of production based on the experimental study of the tool / material mechanical interactions generated during the welding ...
BECKER, Eric; LANGLOIS, Laurent; FAVIER, Véronique; BIGOT, Régis (Trans Tech Publications/ Michael Modigell, 2014)The present paper focuses the modelling and the simulation of a direct thixoextrusion test achieved on C38 semi-solid steel. To validate the modelling and the simulation, it is important to get various experimental ...