Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser Pulses
Conventional hardening, sometimes, is not economically viable due to consuming additional costs and energy. This makes applying selective hardening on specific regions an attractive alternative for members subjected to local friction and wear. This work is devoted for applying cold working hardenin...
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University of Diyala
2025-03-01
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| Series: | Diyala Journal of Engineering Sciences |
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| Online Access: | https://djes.info/index.php/djes/article/view/1590 |
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| author | Furat I. Hussein Sanaa Al-Sumaidae Ahmed Alhamaoy Kareem N. Salloomi Muhannad Ahmed Obeidi |
| author_facet | Furat I. Hussein Sanaa Al-Sumaidae Ahmed Alhamaoy Kareem N. Salloomi Muhannad Ahmed Obeidi |
| author_sort | Furat I. Hussein |
| collection | DOAJ |
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Conventional hardening, sometimes, is not economically viable due to consuming additional costs and energy. This makes applying selective hardening on specific regions an attractive alternative for members subjected to local friction and wear. This work is devoted for applying cold working hardening on discrete values on regions of aluminum 6061-O alloy using nanosecond fiber laser of 100 W average power and pulse duration of 81 ns. An exaggerated plasma pressure resulted from ablation a thin coat layer on the metal surface was built in order to cause cold plastic deformation and increase the surface hardness of the alloy. The power density (Pd) and pulse overlap percentage (OV) were employed as working parameters. Due to the sensitivity of aluminium alloys to excessive heating, the criteria of the best outcomes were considered according to the objective of the study in supporting the hardness by strain hardening. The higher attained a significant increase in the hardness associated with less consumed optical energy, the most clean and flawless surface, observed by the high-resolution SEM images, which indicates hardening with cold work. The best hardness value is conducted at a Pd of 4.46 GW/cm2 reaching a hardness of 57.6 HV at an OV of 43% and 53.8 VHD at an OV of 77.3%. The X-Ray diffraction analysis (XRD) revealed a reduction of 56% in grain size compared to the original alloy and increase in the number of dislocations density by 378%.
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| format | Article |
| id | doaj-art-3071f76f62dd40d0943beb5039b1269e |
| institution | OA Journals |
| issn | 1999-8716 2616-6909 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | University of Diyala |
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| series | Diyala Journal of Engineering Sciences |
| spelling | doaj-art-3071f76f62dd40d0943beb5039b1269e2025-08-20T02:12:03ZengUniversity of DiyalaDiyala Journal of Engineering Sciences1999-87162616-69092025-03-0118110.24237/djes.2025.18107Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser PulsesFurat I. Hussein0Sanaa Al-Sumaidae1Ahmed Alhamaoy2Kareem N. Salloomi3Muhannad Ahmed Obeidi4Mechatronics Engineering Department, Al-Khwarizmi College of Engineering, University of Baghdad, Baghdad, 10071 Iraq Automated Manufacturing Department, Al-Khwarizmi College of Engineering, University of Baghdad, Baghdad, 10071 IraqLaser and Optoelectronic Eng. Dep., College of Engineering, Al-Nahrain UniversityAutomated Manufacturing Department, Al-Khwarizmi College of Engineering, University of Baghdad, Baghdad, 10071 IraqSchool of Mechanical & Manufacturing Engineering, Dublin City University, Dublin, Ireland Conventional hardening, sometimes, is not economically viable due to consuming additional costs and energy. This makes applying selective hardening on specific regions an attractive alternative for members subjected to local friction and wear. This work is devoted for applying cold working hardening on discrete values on regions of aluminum 6061-O alloy using nanosecond fiber laser of 100 W average power and pulse duration of 81 ns. An exaggerated plasma pressure resulted from ablation a thin coat layer on the metal surface was built in order to cause cold plastic deformation and increase the surface hardness of the alloy. The power density (Pd) and pulse overlap percentage (OV) were employed as working parameters. Due to the sensitivity of aluminium alloys to excessive heating, the criteria of the best outcomes were considered according to the objective of the study in supporting the hardness by strain hardening. The higher attained a significant increase in the hardness associated with less consumed optical energy, the most clean and flawless surface, observed by the high-resolution SEM images, which indicates hardening with cold work. The best hardness value is conducted at a Pd of 4.46 GW/cm2 reaching a hardness of 57.6 HV at an OV of 43% and 53.8 VHD at an OV of 77.3%. The X-Ray diffraction analysis (XRD) revealed a reduction of 56% in grain size compared to the original alloy and increase in the number of dislocations density by 378%. https://djes.info/index.php/djes/article/view/1590Nanosecond laserAl 6061-O alloyHardnessSurface RoughnessLaser Hardening |
| spellingShingle | Furat I. Hussein Sanaa Al-Sumaidae Ahmed Alhamaoy Kareem N. Salloomi Muhannad Ahmed Obeidi Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser Pulses Diyala Journal of Engineering Sciences Nanosecond laser Al 6061-O alloy Hardness Surface Roughness Laser Hardening |
| title | Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser Pulses |
| title_full | Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser Pulses |
| title_fullStr | Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser Pulses |
| title_full_unstemmed | Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser Pulses |
| title_short | Selective Laser Hardening of Aluminium AA6061-O Alloy with Nanosecond Laser Pulses |
| title_sort | selective laser hardening of aluminium aa6061 o alloy with nanosecond laser pulses |
| topic | Nanosecond laser Al 6061-O alloy Hardness Surface Roughness Laser Hardening |
| url | https://djes.info/index.php/djes/article/view/1590 |
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