The document is a presentation on Selective Laser Melting (SLM) in additive manufacturing, covering its processes, methods, advantages, and parameters affecting quality. It highlights SLM's ability to create complex metal components layer by layer from CAD models without pre-production costs and with mechanical properties similar to traditional methods. The presentation also discusses applications in various industries, such as biomedical, automotive, and aerospace.

1. A PowerPoint presentation on
SELECTIVE LASER MELTING (SLM)
IN ADDITIVE MANUFACTURING.
BY:
N.Sashi Kumar (III B.Tech )-13121A03A3
N.V.Rohith (III B.Tech)-13121A03A2
Dept. of Mechanical Engineering,SVEC.

2. Contents
 Introduction
 Process
 Printing methods
 Why SLM?
 SLM parameters
 Polymer properties for SLM
 Applications
 Conclusion

3. Introduction
 3-D Printing.
 Type of Industrial Robot.
 Encompasses process like Extrusion, Sintering.
 Process refers to sequential deposit of material on to powder bed
using computer control.

4. Process
 3-D Modelling.
 Slicing.
 Printing (depositing material).
 Inspection.

5. Schematic representation.

6. Printing Methods
 SELECTIVE LASER MELTING (SLM).
 SELECTIVE LASER SINTERING.
 FUSED FILAMEN FABRICATION.
Melting of powder bed using high energy lasers.

7. What is SLM?
 The additive manufacturing technology.
 SLM make it possibility to metal components layer by layer according to a 3D-
CAD models.
 Complex geometrics with out need of pre-production costs.
 Melts the material on the powder bed layer by layer.

8. Why SLM?
 Alloys of Titanium, cobalt chrome, aluminum can be fabricated.
 No compromise in accuracy.
 No need of any auxiliary holding devices – Melting on powder bed.
 Completely melts the powder instead of fusing granules.
 Obtains mechanical properties similar to conventional manufacturing.

9. Parameters that effect the SLM
 Atmosphere
 Temperature
 Powder
 Laser power & thickness

10.  -ve effect on mechanical properties
 oxygen is responsible for pores
 SLM atmosphere must equipped with N, Ar, He.
Laser Power & Thickness
 Laser intensity is different for different types of materials
 Laser thick ness is associated with granularity and type of
material
Atmosphere

11. Temperature
The temperature is set between 220c and 3000c.
It is easier to melt powder layer with laser
Powder
Layer thickness 20µm to 100µm and Spherical
Building speed, density of parts produced

12. Polymer properties for SLM
Thermal properties
Optical properties
Viscosity and Surface Tension
Particle

13. Thermal properties
 Crystallization Temperature (Tc,
blue line) and Melting
Temperature (Tm, red line)
 Region between the Tc and Tm is
called metastable Region or
Sintering window .
 The difference between Tm and Tc
gives Metastable area.

14. Optical properties
The powder should be capable of absorbing the
energy of wavelength emitted from laser
Viscosity And Surface tension
Zero viscosity and low surface tension are
essential for successful SLM processing

15. Particle
The particles should be spherical for free-
flowing on the bed of SLM machine
The particle is in between 20µm and 80µm

16. Applications
Bio-medical Automotive
Building And
Modeling

17. Applications
Food Industry Electrical Aerospace

18. Conclusion
SLM offers a great potential to solve the
challenges of serving individual customer requirements,
on the one hand, and high quality as well as low cost
products