Unpublished conference/Abstract (Scientific congresses and symposiums)
Laser Clad High Speed Steel thick deposits: Correlations between the local thermal history, the microstructures and the wear mechanisms
Mertens, Anne; Hashemi, Seyedeh Neda; Tchuindjang, Jérôme Tchoufack et al.
2018International Conference on Plasticity, Damage and Fracture 2018
Peer reviewed
 

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Keywords :
High Speed Steels; Laser Cladding; Thermal history; Microstructure; Wear; FEM
Abstract :
[en] Thick High Speed Steel (HSS) coatings are Fe-Cr-C-based alloys that have proved useful in a wide variety of applications including machining and cutting, hot stamping and hot strip mills, thanks to their complex microstructure containing very hard carbides as e.g. V-rich MC, Mo- or W-rich M2C, Cr-rich M7C3 or M3C. Direct laser deposition, also known as laser cladding, has recently emerged as a very promising technique for the production and repair of such thick coatings. Indeed, the very high cooling and solidification rates imposed by laser cladding result in strongly refined out-of-equilibrium microstructures and potentially enhanced wear resistance. However, the progressive accumulation of heat in the deposit during fabrication leads to variations of the thermal history as a function of position inside the build, resulting in turn into local variations of microstructure and wear properties. Consequently, this work aims to investigate the correlations between the local thermal history, the microstructures and the wear mechanisms of three HSS grades with varying contents of V, Mo and W so as to vary the type, size, morphology and amounts of the hard carbides. In a first step, 2D finite element simulations compute the thermal field during the direct laser deposition of 20 mm thick HSS coatings (a similar FE approach [Tran 2017] has already been published by the group on Ti alloy). The validated thermal history yields a deeper understanding of the microstructure generated as a function of the position inside the deposits. In a second step, the wear behaviour of the deposits is characterised at two different depths (i.e. at 2 mm from the free surface or at 2/3 of the total height) and for two constant test temperatures (i.e. room temperature [Hashemi 2017] and 300°C) using a pin-on-disc tribometer. In analysing the results of these tests, a particular attention was given to the role of the various carbides – including their type, morphology, hardness and failure mode – in determining the wear mechanisms of laser clad HSS deposits at the two tested temperatures. REFERENCES: Tran H.S., Tchuindjang J.T., Paydas H., Mertens A., Jardin R.T., Duchene L., Carrus R., Lecomte-Beckers J. and Habraken A., 2017, “3D thermal finite element analysis of laser cladding processed Ti-6Al-4V part with microstructural correlations” Mater. Des. 128, 130. Hashemi N., Mertens A., Montrieux H.-M., Tchuindjang J.T., Dedry O., Carrus R. and Lecomte-Beckers J., 2017, “Oxidative wear behaviour of laser clad high speed steel thick deposits: Influence of sliding speed, carbide type and morphology” Surf. Coat. Technol. 315, 519
Disciplines :
Materials science & engineering
Author, co-author :
Mertens, Anne  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Hashemi, Seyedeh Neda ;  Université de Liège - ULiège > Département ArGEnCo > Département Argenco : Secteur MS2F
Tchuindjang, Jérôme Tchoufack  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Dedry, Olivier  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Montrieux, Henri-Michel ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Tomé Jardin, Ruben Antonio ;  Université de Liège - ULiège > Département ArGEnCo > Département Argenco : Secteur MS2F
Tran, Hoang Son ;  Université de Liège - ULiège > Département ArGEnCo > Département Argenco : Secteur MS2F
Carrus, Raoul;  Sirris
Habraken, Anne  ;  Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Laser Clad High Speed Steel thick deposits: Correlations between the local thermal history, the microstructures and the wear mechanisms
Publication date :
04 January 2018
Event name :
International Conference on Plasticity, Damage and Fracture 2018
Event place :
San Juan, Puerto Rico
Event date :
du 3 au 9 janvier 2018
By request :
Yes
Audience :
International
Peer reviewed :
Peer reviewed
Available on ORBi :
since 04 January 2018

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