Effect of laser scanning speed on surface properties of Ti-Si laser clad intermetallic coatings fabricated on Ti-6Al-4V alloy

被引:0
作者
Phala M.F. [1 ]
Popoola A.P.I. [1 ]
Tlotleng M. [2 ]
Pityana S.L. [2 ]
机构
[1] Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, P.M.B X680, Pretoria
[2] Council of Scientific and Industrial Research, National Laser Centre, Building 46F, P.O. Box 395, Pretoria
基金
新加坡国家研究基金会;
关键词
Coating thickness; Grain structure; HAZ; Heat affected zone; Laser cladding; Microhardness; Microstructure; Scanning speed; Substrate; Ti5Si3; phase; Titanium;
D O I
10.1504/IJMMP.2018.097217
中图分类号
学科分类号
摘要
A binary Ti-Si (1: 1) alloy coating was fabricated on Ti-6Al-4V alloy using laser cladding technique where Neodymium yttrium aluminium garnet laser was utilised. Micro-atomised powders of Ti and Si were used for deposition of multi-track clad coatings utilising power of 1.5 kW and a varied speed of 1.2 m/min, 1.6 m/min and 2.0 m/min. Scanning electron microscope coupled with energy dispersive spectrometer was used for microstructural characterisation and elemental analysis while a digital light microscope was used for optical imaging and coating thickness measurements. Phase identification was conducted using X-ray diffraction analyser and transverse microhardness evaluated at 100 gf for 10 s dwell time was achieved with the use of a Vickers hardness machine. The laser fabricated coatings were found to exhibit a decrease in grain size with an increase in the laser scanning speed. The microstructure of the coatings ranged from irregular refined grains, faceted grains and lamellar eutectic network of TiSS + Ti5Si3. The hardness of the coatings exhibited Ti, Si, TiS2 and Ti5Si3 phases averaged a 247.4% increase with maximum hardness recorded at 1.2 m/min scanning speed. Copyright © 2018 Inderscience Enterprises Ltd.
引用
收藏
页码:331 / 343
页数:12
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