Laser nitriding of the surface layer of Ti6Al4V titanium alloy

• Autorzy: Filip R.
• Języki publikacji: PL

Abstrakty

EN

Purpose: The purpose of this paper is modification of the surface layer of the Ti6Al4V titanium alloy microstructure and properties by laser remelting in nitrogen atmosphere. Design/methodology/approach: Laser treatment was performed on the samples in stream of nitrogen. Microstructure of laser treated layer was investigated by using Epiphot 300 optical microscope and Novascan 30 scanning electron microscope. Phase composition was determined using X-ray diffractometry. The roughness of surface of treated material was examined using topography scanning system T 8000 made by Hommelwerke GMBH. The Vickers hardness under load of 1.96 N was measured on the cross sections of surface layer. The wear properties of alloyed zone were tested on the testing machine T 08M using ‘pin on disc’ test. Findings: Laser remelting process has produced a surface layer consists of hard ceramics particles of TiN and Ti2N phases spaced in martensitic matrix. The hardness of surface layer increases clearly in comparison with untreated alloy due to formation of TiN and Ti2N particles and depends on the volume fraction of nitrides. Their maximum value of the hardness (1500 HV 0.2) occurs on the surface of laser treated zone. Wear resistance of laser nitrided layer increases considerably in relation to base alloy. Research limitations/implications: Research range was limited to microstructure, phase composition, hardness, fractography and wear resistance investigations. To estimate the influence of the laser nitriding process on corrosion resistance of the layer additional examinations will be performed in future research. Practical implications: Laser remelting of titanium alloy in nitrogen atmosphere makes possible to obtain coatings composed of ceramic particles spaced in metallic matrix characterised by high hardness and wear resistance. Originality/value: The range of investigation included microstructure, phase composition, hardness as well as fractographic estimation and wear properties enables analysis of laser nitriding process efficienty.

Słowa kluczowe

PL

stopy metaliczne; mikrostruktura; odporność na zużycie; oczyszczanie powierzchni; technologia laserowa

EN

metallic alloys; microstructure; wear resistance; surface treatment; laser technology

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2008
• Tom: Vol. 30, nr 1
• Strony: 25--28
• Opis fizyczny: Bibliogr. 16 poz.

Twórcy

autor

Filip R.

• Department of Materials Science, Rzeszów University of Technology, ul. W. Pola 2, 35-959 Rzeszów, Poland,

Bibliografia

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