Laser metal deposition of vanadium-rich high speed steel: Microstructural and high temperature wear characterization

SURFACE & COATINGS TECHNOLOGY

卷:364

Article; Proceedings Paper

Rahman, N. Ur¹  Capuano, L.¹  de Rooij, M. B.²  Matthews, D. T. A.^1,3  Garcia-Junceda, A.⁴  Mekicha, M. A.²  Cordova, L.⁵  Walmag, G.⁶  Sinnaeve, M.⁷  Romer, G. R. B. E.¹ 

[1] Univ Twente, Chair Laser Proc, Dept Mech Solids Surfaces & Syst MS 3, Fac Engn Technol, Enschede, Netherlands

[2] Univ Twente, Chair Surface Technol & Tribol, Dept Mech Solids Surfaces & Syst MS 3, Fac Engn Technol, Enschede, Netherlands

[3] Univ Twente, Chair Skin Tribol, Dept Mech Solids Surfaces & Syst MS 3, Fac Engn Technol, Enschede, Netherlands

[4] IMDEA Mat Inst, C Eric Kandel 2, Madrid 28906, Spain

[5] Univ Twente, Fac Engn Technol, Dept Mech Solids Surfaces & Syst MS 3, Chair Dynam Based Maintenance, Enschede, Netherlands

[6] CRM Grp, Met Proc Technol, Rue Ples 1 B56 Quartier Polytech 2, B-4000 Liege, Belgium

[7] Marichal Ketin, Rue Ernest Solvay 372, B-4000 Liege, Belgium

关键词: High speed steel;    Laser metal deposition;    Microstructural refinement;    Hot metal forming;    Carbide morphology;    Oxidative wear;   

DOI  :  10.1016/j.surfcoat.2019.02.044

来源: Elsevier

【 摘 要 】

A comparative high temperature wear study was conducted between two alloys: laser metal deposited vanadium-rich (V-rich) high speed steel (HSS) and spun cast carbide enhanced indefinite chilled double poured (CE-ICDP) iron. Laser Metal Deposition (LMD) of V-rich HSS alloy was performed by using a 4.0 kW Nd:YAG laser at three different laser scan speeds to investigate the effect thereof on the carbide size and morphology, phase constitution and mechanical properties (such as micro-hardness and wear resistance) of the laser metal deposits. A comprehensive microstructural characterization of these alloys revealed that the dendritic microstructure of the V-rich HSS alloy consisted of martensitic matrix and VC carbides. Increasing the laser processing speeds significantly changed the morphologies of VC carbides from square and round to angular and rod-like shapes. The micro-hardness of the V-rich HSS was improved from 760 HV to 835 HV by increasing the laser processing speed. During high temperature (500 degrees C) pin-on-disc wear tests, the V-rich HSS showed excellent wear resistance compared to CE-ICDP iron. It was found that V-rich HSS with square and round shape VC carbides (V-rich 10 mm/s) showed the most improved tribological performance with oxidative wear found to be the dominant wear mechanism at this temperature.

【 授权许可】

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