Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laser
One potentially useful technique for producing NiTi intermetallic components is the laser powder bed fusion (LPBF). However, due to the deterioration of the mechanical qualities, other defects including the poor surface quality and the near surface porosity that are inherent to the process are restr...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-12-01
|
| Series: | Applied Surface Science Advances |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666523924000655 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846137638693634048 |
|---|---|
| author | Muhannad Ahmed Obeidi Ahmed R. Al-Hamaoy Abhijit Cholkar Neha Agarwal Dermot Brabazon |
| author_facet | Muhannad Ahmed Obeidi Ahmed R. Al-Hamaoy Abhijit Cholkar Neha Agarwal Dermot Brabazon |
| author_sort | Muhannad Ahmed Obeidi |
| collection | DOAJ |
| description | One potentially useful technique for producing NiTi intermetallic components is the laser powder bed fusion (LPBF). However, due to the deterioration of the mechanical qualities, other defects including the poor surface quality and the near surface porosity that are inherent to the process are restricting the technology's standardisation and broad use. This study employed a thorough investigation to use laser polishing of additively manufactured samples made from pre-alloyed NiTi powder by LPBF to enhance the surface quality and remove the near surface porosity. The use of laser polishing technique on the LPBF parts is preferred because it eliminates or reduces the amount of material removal through remelting and relocation of material from the high peaks to the lower valleys. Two types of laser systems carbon-dioxide (CO2) and femtosecond were used to process the surface and near-surface area. The optimum results for porosity healing have been found when using the CO2 laser power of 75 W, scanning speed of 11 mm/s and an input energy density of 34 J/mm2 and laser spot size of 200 μm. An improvement in the average surface roughness of 91 % was achieved when the CO2 laser beam was used. The X-ray test results showed slight intensity change for the samples polished by the CO2 laser. In contrast, a phase change was observed on the surface of the samples polished by the femtosecond laser due to the formation of oxide layer. Also, limited improvement in the surface quality was obtained when the femtosecond laser irradiation was used. |
| format | Article |
| id | doaj-art-2b0362fb8e584af2a5d351b5782fff57 |
| institution | Kabale University |
| issn | 2666-5239 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Applied Surface Science Advances |
| spelling | doaj-art-2b0362fb8e584af2a5d351b5782fff572024-12-08T06:12:44ZengElsevierApplied Surface Science Advances2666-52392024-12-0124100637Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laserMuhannad Ahmed Obeidi0Ahmed R. Al-Hamaoy1Abhijit Cholkar2Neha Agarwal3Dermot Brabazon4School of Mechanical & Manufacturing Engineering, Dublin City University, Ireland; I-Form Advanced Manufacturing Research Centre, Dublin, Ireland; Advanced Processing Technology Centre, Dublin, Ireland; Nammo Ireland Ltd, Dubin, Ireland; Corresponding author.Department of Laser and Optoelectronics Engineering, College of Engineering, Al-Nahrain University, Baghdad, IraqSchool of Mechanical & Manufacturing Engineering, Dublin City University, Ireland; I-Form Advanced Manufacturing Research Centre, Dublin, Ireland; Advanced Processing Technology Centre, Dublin, IrelandSchool of Mechanical & Manufacturing Engineering, Dublin City University, Ireland; I-Form Advanced Manufacturing Research Centre, Dublin, Ireland; Advanced Processing Technology Centre, Dublin, Ireland; Corresponding author.School of Mechanical & Manufacturing Engineering, Dublin City University, Ireland; I-Form Advanced Manufacturing Research Centre, Dublin, Ireland; Advanced Processing Technology Centre, Dublin, IrelandOne potentially useful technique for producing NiTi intermetallic components is the laser powder bed fusion (LPBF). However, due to the deterioration of the mechanical qualities, other defects including the poor surface quality and the near surface porosity that are inherent to the process are restricting the technology's standardisation and broad use. This study employed a thorough investigation to use laser polishing of additively manufactured samples made from pre-alloyed NiTi powder by LPBF to enhance the surface quality and remove the near surface porosity. The use of laser polishing technique on the LPBF parts is preferred because it eliminates or reduces the amount of material removal through remelting and relocation of material from the high peaks to the lower valleys. Two types of laser systems carbon-dioxide (CO2) and femtosecond were used to process the surface and near-surface area. The optimum results for porosity healing have been found when using the CO2 laser power of 75 W, scanning speed of 11 mm/s and an input energy density of 34 J/mm2 and laser spot size of 200 μm. An improvement in the average surface roughness of 91 % was achieved when the CO2 laser beam was used. The X-ray test results showed slight intensity change for the samples polished by the CO2 laser. In contrast, a phase change was observed on the surface of the samples polished by the femtosecond laser due to the formation of oxide layer. Also, limited improvement in the surface quality was obtained when the femtosecond laser irradiation was used.http://www.sciencedirect.com/science/article/pii/S2666523924000655NitinolLaser polishingAdditive manufacturingLaser powder bed fusionX-ray |
| spellingShingle | Muhannad Ahmed Obeidi Ahmed R. Al-Hamaoy Abhijit Cholkar Neha Agarwal Dermot Brabazon Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laser Applied Surface Science Advances Nitinol Laser polishing Additive manufacturing Laser powder bed fusion X-ray |
| title | Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laser |
| title_full | Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laser |
| title_fullStr | Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laser |
| title_full_unstemmed | Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laser |
| title_short | Comparing the surface characteristics of additively manufactured nitinol parts polished by femto-second and CO2 laser |
| title_sort | comparing the surface characteristics of additively manufactured nitinol parts polished by femto second and co2 laser |
| topic | Nitinol Laser polishing Additive manufacturing Laser powder bed fusion X-ray |
| url | http://www.sciencedirect.com/science/article/pii/S2666523924000655 |
| work_keys_str_mv | AT muhannadahmedobeidi comparingthesurfacecharacteristicsofadditivelymanufacturednitinolpartspolishedbyfemtosecondandco2laser AT ahmedralhamaoy comparingthesurfacecharacteristicsofadditivelymanufacturednitinolpartspolishedbyfemtosecondandco2laser AT abhijitcholkar comparingthesurfacecharacteristicsofadditivelymanufacturednitinolpartspolishedbyfemtosecondandco2laser AT nehaagarwal comparingthesurfacecharacteristicsofadditivelymanufacturednitinolpartspolishedbyfemtosecondandco2laser AT dermotbrabazon comparingthesurfacecharacteristicsofadditivelymanufacturednitinolpartspolishedbyfemtosecondandco2laser |