Laser surface hardening of most of the industrial components require depth of surface modification in the range of 100–150 micron. Conventional laser surface hardening uses laser as a heat source to modify a particular area of the surface without melting in an inert gas environment. However, the hardened profile in this case shows peak hardness value at a certain depth from the top surface. Also, hardening the top surface to get relatively much higher hardness near the top surface in case of thin sheets becomes difficult due to accumulation of heat below the surface of the specimen which in turn lowers the cooling rate. Hence, self-quenching becomes inadequate. In the present study, an in-house fabricated laser processing head with coaxial water nozzle has been used to flow a laminar water-jet during the laser surface hardening process to induce forced convection at the top surface. Thus, heat gets carried away by the water-jet from the top surface and by the water from the bottom surface as well. Results show that with judicious selection of process parameters, it is possible to get higher hardness (800 HV) to that of conventional laser surface hardening (500 HV) at the top surface using this process. Present process can be used for those cases where high hardness values are required near the top surface specially for thin sheets and thermally sensitive materials.
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ASME 2018 13th International Manufacturing Science and Engineering Conference
June 18–22, 2018
College Station, Texas, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-5138-8
PROCEEDINGS PAPER
Water-Jet Assisted Laser Surface Hardening of Medium Carbon Steel Using Fiber Laser
Sagar Sarkar,
Sagar Sarkar
Indian Institute of Technology, Kharagpur, Kharagpur, India
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Ashish Kumar Nath
Ashish Kumar Nath
Indian Institute of Technology, Kharagpur, Kharagpur, India
Search for other works by this author on:
Sagar Sarkar
Indian Institute of Technology, Kharagpur, Kharagpur, India
Ashish Kumar Nath
Indian Institute of Technology, Kharagpur, Kharagpur, India
Paper No:
MSEC2018-6457, V004T03A054; 6 pages
Published Online:
September 24, 2018
Citation
Sarkar, S, & Nath, AK. "Water-Jet Assisted Laser Surface Hardening of Medium Carbon Steel Using Fiber Laser." Proceedings of the ASME 2018 13th International Manufacturing Science and Engineering Conference. Volume 4: Processes. College Station, Texas, USA. June 18–22, 2018. V004T03A054. ASME. https://doi.org/10.1115/MSEC2018-6457
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