06.2021.379.386

Comparison study of AISI 304 stainless steel colour marking using micro and nano second pulsed ytterbium fibre laser

Author(s):

Ayat Khalaf Rahma, Ziad Aeyad Taha

Affiliation(s):

Institute of Laser for Postgraduate Studies, University of Baghdad

Corresponding Author Email: h.a_eng89@yahoo.com

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

This article introduces the results of measurements and analysis of the impact of laser marking process characteristics on the colour achieved. The study was conducted for AISI 304 multifunctional stainless steel using two different types of fibre lasers with a pulse width of 10 µs for the first laser and 81ns for the second one. There were different process parameters such as scanning speed and power, that affect the repeatability of the colours obtained. Numerous instruments were used to objectively measure colour changes, including an optical microscope, FESEM, XRD, a roughness surface tester, an EDS, and a hand colourimeter. Different ranges of colour obtained by both types of laser with higher surface roughness when using microsecond pulse width.