Effect of Scanning Speed on the Surface Roughness of Laser Metal Deposited Copper on Titanium Alloy

Mutiu Folorunsho Erinosho,Esther Titilayo Akinlabi,Oluwagbenga Temidayo Johnson

doi:10.1590/1980-5373-mr-2019-0297

Mutiu Folorunsho Erinosho, Esther Titilayo Akinlabi + Show 1 more

Open Access

https://doi.org/10.1590/1980-5373-mr-2019-0297

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Abstract

This paper reports on the effect of scanning speed on the laser deposited Cu on titanium alloy substrate. The experiments were conducted by varying the scanning speed from 0.3 m/min to 1.2 m/min while the laser power, the powder feed rate and the gas flow rate were kept constant. The laser deposited Cu were characterized through the evolving microstructure and surface roughness. Dendrites and acicular were much pronounced in the clad area; found to decrease as the scanning speed increases due to the laser interaction time and the cooling rate. These however, influenced the irregularities in the peaks and valleys of the surface texture. The arithmetic mean deviation, Ra were measured and abridged from 6.70 µm to 1.41 µm as the scanning speed was increased from samples DC1 to DC4. The motivation for this work is to improve the surface performance of Ti6Al4V alloy when exposed and attacked by marine microfouling organisms.

Highlights

Laser Metal Deposition (LMD) is known as the process of using a laser beam of high intensity to create a melt pool on a metal substrate; and in which powders were deposited to form the clad and fusion bond
The Scanning Electron Microscopy (SEM) microstructures of laser deposited samples DC1 to DC4 observed at 1000x magnification are presented
The melt pool created with the scan speed of 0.3 m/min is enough to accommodate the volume of Cu deposited powder and to give good bonding but since the wettability between the deposited Cu powder and the Ti6Al4V alloy substrate is truncated at slow scanning speed, good bonding is limited

Summary

Introduction

Laser Metal Deposition (LMD) is known as the process of using a laser beam of high intensity to create a melt pool on a metal substrate; and in which powders were deposited to form the clad and fusion bond. Ti6Al4V alloy belongs to the group of advanced materials with their application in the aerospace 2. The sputtering of titanium films were deposited on three different substrates which includes copper, glass and silicon substrates at a temperature of 473 K for 3 hours each in order to optimize the process parameters. No voids were observed at the thickness of the coatings between the interface of the titanium film and the substrate. The coatings on the copper substrate were even as compared to other substrates but the deposition did not show preferred orientation and intensity 8. This paper reports the effect of scanning speed on the laser metal deposited Cu and Ti6Al4V alloy with potential for marine application. The scanning speeds are varied from 0.3 m/min to 1.2 m/min while the laser power, the powder flow rate and the gas flow rate were kept constant

Experimental set up

Results and Discussion

Conclusions