Effect of number of laser scans on the corrosion behavior of laser formed Titanium alloy

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Abstract

This paper reports the investigation conducted on the corrosion behavior of laser formed Titanium alloy (Ti6AI4V). The Titanium alloy sample strips of 1 ×90 × 30 mm3 were laser formed with the following process parameters; laser power (800 W), beam diameter (12 mm) and scanning speed (0.03 m/min) and the number of scans were varied between 3 to 7. The laser formed samples were characterised through the microstructure, hardness and the corrosion behaviour. The visual inspection conducted on the laser formed samples revealed a de-colouration on the samples mostly along the laser tracks. The microstructural evaluation and the grain size measurements were conducted to establish the evolution of the properties of the formed samples. The microstructure of the formed sample was observed to be martensitic in nature compared to the equiaxed microstructure observed in the as-received material. Furthermore, microcracks were also observed in the heat-affected zone. The microcracks observed on the surface of the formed samples revealed that the length of the cracks increases with the number of laser scans. The grain sizes were observed to decrease with the increasing number of laser scans. It was observed that as the number of laser scans increases, the corrosion properties became enhanced.This paper reports the investigation conducted on the corrosion behavior of laser formed Titanium alloy (Ti6AI4V). The Titanium alloy sample strips of 1 ×90 × 30 mm3 were laser formed with the following process parameters; laser power (800 W), beam diameter (12 mm) and scanning speed (0.03 m/min) and the number of scans were varied between 3 to 7. The laser formed samples were characterised through the microstructure, hardness and the corrosion behaviour. The visual inspection conducted on the laser formed samples revealed a de-colouration on the samples mostly along the laser tracks. The microstructural evaluation and the grain size measurements were conducted to establish the evolution of the properties of the formed samples. The microstructure of the formed sample was observed to be martensitic in nature compared to the equiaxed microstructure observed in the as-received material. Furthermore, microcracks were also observed in the heat-affected zone. The microcracks observed on the surface of the formed samples revealed that the length of the cracks increases with the number of laser scans. The grain sizes were observed to decrease with the increasing number of laser scans. It was observed that as the number of laser scans increases, the corrosion properties became enhanced.

Original languageEnglish
Title of host publicationWorld Congress on Engineering, WCE 2014
PublisherNewswood Limited
Pages1431-1435
Number of pages5
ISBN (Print)9789881925350
Publication statusPublished - 2014
EventWorld Congress on Engineering, WCE 2014 - London, United Kingdom
Duration: 2 Jul 20144 Jul 2014

Publication series

NameLecture Notes in Engineering and Computer Science
Volume2
ISSN (Print)2078-0958

Conference

ConferenceWorld Congress on Engineering, WCE 2014
Country/TerritoryUnited Kingdom
CityLondon
Period2/07/144/07/14

Keywords

  • Corrosion
  • Laser forming
  • Micro cracks
  • Microstructure

ASJC Scopus subject areas

  • Computer Science (miscellaneous)

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