Influence of laser texturing on microstructure, surface and corrosion properties of Ti-6Al-4V

Conradi, Marjetka (author), Kocijan, Aleksandra (author), Klobčar, Damjan (author), Godec, Matjaž (author)

We present the modification of Ti-6Al-4V surfaces with a diode end-pumped Nd:YVO4 laser by varying the distance between laser-produced micro(µ)-channels. We analyzed the influence of laser texturing on the morphology, microstructure, surface and corrosion properties of Ti-6Al-4V. SEM imaging reveals a characteristic µ-channel pattern with different scan line separations, while electron backscatter diffraction (EBSD) indicates that laser texturing with the current parameters influences the microstructure up to 2 µm deep with the most significant influence at the tips, where melting and rapid solidification occur. The Vickers hardness test indicates a surface hardening effect of the laser-textured compared to the as-received Ti-6Al-4V surfaces. The XPS analysis showed that the oxide layer on the laser-textured samples was considerably thicker compared to the as-received sample, at 20 and 7 nm, respectively. We observed that the wettability was strongly correlated with the scan line separation. The results show increased hydrophobicity with increased scan line separation. The corrosion resistance was improved for laser-textured surfaces compared to the as-received surface and increased with the scan line separation.

• Language: English
• Keywords: surface texture, Ti-6Al-4V alloy, microstructure, wettability, corrosion
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2020
• Number of pages: 9 str.
• Numbering: Vol. 10, iss. 11, art. 1504
• PID: 20.500.12556/RUL-134702
• UDC: 620.1: 544.53:620.194
• ISSN on article: 2075-4701
• DOI: 10.3390/met10111504
• COBISS.SI-ID: 37036803
• Publication date in RUL: 27.01.2022

Record is a part of a journal

• Title: Metals
• Shortened title: Metals
• Publisher: MDPI AG
• ISSN: 2075-4701
• COBISS.SI-ID: 15976214

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 11.11.2020

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0132
• Name: Fizika in kemija površin kovinskih materialov