Effect Of Fiber Laser Modification On Surface Marking Of 22mnbr5 Boron Steel

• Main Author: Mohd Nor, Nurul Aini Nadirah
• Format: Thesis
• Language: English; English
• Published: 2020
• Subjects: T Technology (General); TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.utem.edu.my/id/eprint/25419/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=119593

Laser engraving is a method in which a laser fiber is bombarded into the material surface. This research is conducted to evaluate the effect of engraving speed, laser power and frequency on the 22MnBr5 Boron steel based on the surface roughness and hardness. Furthermore, the purpose of this research also to propose optimum laser parameters of 22MnBr5 Boron steel based on the surface roughness and hardness. The variable parameters which are laser power, engraving speed and laser frequency were designed using experiment design (DOE). The specimen been tested is 22MnBr5 boron steel. The sample is engraved based on the parameters extracted from the DOE. The engraved parts are analyzed in terms of surface integrity (surface roughness) and its hardness. The surface roughness is measured using a surface roughness tester whereas the Rockwell hardness tester is utilized to measure the hardness value of each engraved sample. From the response that is obtained from the experiment, the ANOVA analysis is done to identify the effect of the variable parameters on the surface roughness and hardness value. Based on the analysis, it can be concluded that all the parameters; engraving speed, laser power and frequency are significant and the range of value used are valid on the surface roughness and hardness testing. This experiment reveals that the higher the engraving speed, the smoother the surface of the engraved part. The smoothest value of surface roughness is 1.65µm value from the highest engraving speed of 4000mm/s. In addition, the analysis from RSM shows that the relationship between the parameters and the surface roughness is quadratic. Meanwhile, the linear relationship is achieved between the parameters and the hardness value. The highest hardness value of 39.91 HRC is obtained from the engraving speed of 4000mm/s. This means that the frequency did not establish major variations on the distribution of the hardness. Thus, the situation reveals that the engraving frequency parameter is the least significant compared to the engraving speed and laser power parameters.