Laser modification of surface layer properties of a hot-work tool steel

• Autorzy: Bonek M. , Dobrzański L. A. , Hajduczek E. , Klimpel A.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The objective of the present work was to study the modification of the microstructure of hot-work tool steel X40CrMoV5-1 during the surface modifying by means of laser technology. Design/methodology/approach: The initial experiments consisting in alloying the hot work tool steel indicate to the clear influence of the laser power on the run face shape and its depth. Findings: The structure of material solidifying after laser remelting is characteristic of the diversified morphology connected with the repeated changes of the crystals’ growth direction, from the small dendrites, whose principal axes are oriented in accordance with the heat removal direction sat the boundary between the solid and liquid phases, clusters of carbides arranged in accordance with the swirls caused by the metallic liquid convection motion, and partially non-remelted WC conglomerates as the alloying material in the central area of the remelted zone, to the fine equiaxial grains in the subsurface zone. Research limitations/implications: Laser remelting and alloying with the tungsten carbide results in refinement of the structure in the entire laser power range and in diversification of the grain size in the particular surface layer zones. Practical implications: Laser alloying has the important cognitive significance and gives grounds to the practical employment of these technologies for forming the surfaces of new tools and regeneration of the used ones. Originality/value: The fine grained, dendritic structure occurs in the remelted and alloyed zone with the crystallization direction connected with the dynamical heat abstraction from the laser beam influence zone. The fine grained martensite structure is responsible for hardness increase of the alloyed layer.

Słowa kluczowe

EN

surface treatment; tool steel; alloying; laser treatment

PL

obróbka powierzchniowa; stal narzędziowa; stopowanie; obróbka laserowa

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 14, nr 1-2
• Strony: 152--156
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Bonek M.

• Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Dobrzański L. A.

• Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Hajduczek E.

• Division of Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Klimpel A.

• Welding Department, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

• [1] W.M. Steen: Laser Materials Processing. Second Edition, Springer Verlag, 1998
• [2] L.A. Dobrzański, Fundamentals of Materials Science and Physical Metallurgy. Engineering Materials with Fundamentals of Materials Design, WNT, Warszawa, 2002 (in Polish).
• [3] R. Colaco, R. Vilar: Development of New Coating Materials Using a Laser Rapid-alloy-prototyping-technique, Materials Science Forum, Vol. 414-415 (2003) 164-70.
• [4] M. Bonek: Structure and properties of surface layers obtained by laser treatment of the hot-work tool steel, PhD Thesis, Silesian University of Technology, Faculty of Mechanical Engineering, Gliwice, Poland, 2003, (in Polish).
• [5] L.A. Dobrzański, M. Bonek, M. Piec, E. Hajduczek, A. Klimpel: Laser modification of hot-work tool steels gradient layers, 24th International Congress on Application of Laser & Electro-Optics ICALEO’2005, Miami, USA (2005) (CD).
• [6] M. Bonek, L.A. Dobrzański, E. Hajduczek, A. Klimpel: Fundamental understanding of crystallization mechanism of laser alloyed tool steel, Teheran International Congress on Manufacturing Engineering TICME 2005, Teheran, Iran, (2005) 171-174.
• [7] I.R. Pashby, S. Barnes, B.G. Bryden: Surface hardening of steel using a high power diode laser, Journal of Materials Processing Technology, 139 (2003) 585-588.
• [8] G. Bi, I. Pashby, X. Zhang, J. Segal: Study on the direct metal deposition of powder with a high power diode laser, International Conference on Manufacturing and Materials Processing (ICMM 2006), Kuala Lumpur, Malaysia (2006) 321-326.
• [9] G. Krauss: Microstructures, processing and properties of steels, in, Metals Handbook, Vol. 1, 10th Ed., American Society of Metals, (1990) 126-139.