ML3023 Laser Processing of Materials Syllabus:
ML3023 Laser Processing of Materials Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
The main learning objective of this course is to prepare the students for
1. Obtaining an overview of principle and types of laser
2. Acquiring knowledge about the fundamentals of heat and fluid flow during laser processing.
3. Getting an insight to the metallurgical aspects involved during laser processing.
4. Gaining on the methodology, parameters and imperfections laser welding and surface modification.
5. Getting an exposure to laser instrumentation, parameters and material considerations in laser cutting and drilling process.
UNIT – I PRINCIPLES OF INDUSTRIAL LASERS
Principle of laser generation, Simulated and spontaneous emissions, Einstein’s coefficients, Population inversion, optical resonators, laser modes- mode selection, laser pumping, Rate equation, line- broadening mechanisms, laser beam modifications, types of industrials lasers, Solid state lasers, Gas lasers and semiconductor laser.
UNIT – II THERMAL PROCESS- HEAT AND FLUID FLOW
Heat flow in the work piece, Temperature distribution: thick plate with point heat source, thin plate with line heat source, peak temperature ,cooling rates and Gaussian heat source. Fluid flow in molten pool: continuity equation, Navier-Stokes equation and surface tension effects.
UNIT – III LASER METALLURGY
Process microstructure- fusion zone, zone of partial melting, HAZ. discontinuities- porosity, cracking, lack of fusion, incomplete penetration and undercut.
UNIT – IV LASER WELDING AND SURFACE MODIFICATIONS
Laser welding parameters, Laser efficiency, Process mechanisms (Key hole and Plasmas), Material considerations, imperfections and industrial applications. Recent developments Laser surface modifications: Laser surface heat treatment, Laser surface melting- Glazing, Laser direct Metal deposition– Laser surface alloying, Laser surface cladding and Hard coatings, Laser physical vapour deposition and Laser shock peening.
UNIT – V LASER MACHINING
Laser instrumentation for cutting and drilling, cut quality and process characteristics methods of cutting material consideration, practical performance, process variations , industrial applications of Laser cutting and drilling. New developments- Micromachining.
TOTAL: 45 PERIODS
COURSE OUTCOMES:
Upon completion of this course, the students will be able to:
1. Identify suitable laser source required during laser processing.
2. Explain the heat and fluid flow during laser processing.
3. Analyze the microstructure and discontinuities in the materials subjected to laser processing.
4. Appraise the appropriate methodology, parameters and remedy for imperfections during laser surface modifications
5. Devise the instrumentation for laser cutting and drilling based on the nature of material.
TEXT BOOKS:
1. Elijah kannatey-Asibu, Jr., “Principles of Laser Materials processing “, John Wiley & Sons, 2009
2. John Ion,” Laser Processing of Engineering Materials: Principles, Procedure and Industrial Application”, Elsevier, 2005
REFERENCES:
1. Jacques Perriere, Eric Millon, Eric Fogarassy, “Recent Advances in Laser Processing of Materials”, Elsevier Science, 2006
2. Jonathan R. Lawrence,” Advances in Laser Materials Processing: Technology, Research and Application”, Elsevier Science, 2010
3. Kamleshwar Upadhya, “Plasma and Laser Processing of Material”, TMS, 1991.
4. Peter Schaaf, “Laser Processing of Materials: Fundamentals, Applications and Developments”, Springer Science & Business Media,2010
5. Walter W Duley,” Laser Processing and Analysis of Materials”, Springer Science & Business Media, 2012.