Manufacturing, Microstructure, and Mechanics of 316L SS Biomaterials by Laser Powder Bed Fusion

Area of Science:

• Materials Science
• Biomedical Engineering
• Additive Manufacturing

Background:

• 316L stainless steel is a common material for orthopedic and dental implants.
• Laser powder bed fusion (LPBF) offers potential for creating patient-specific metallic implants with controlled microstructures.
• Optimizing LPBF parameters is crucial for achieving desired material properties.

Purpose of the Study:

• To investigate the LPBF fabrication of 316L stainless steel for biomedical applications.
• To examine the effects of laser power and scanning speed on microstructure and mechanical properties.
• To determine optimal LPBF parameters for enhanced implant material performance.

Main Methods:

• Fabrication of 316L stainless steel using Laser Powder Bed Fusion (LPBF).
• Systematic variation of laser power and scanning speed.
• Microstructural analysis and mechanical property testing (tensile strength, hardness).

Main Results:

• Achieved 99.97% density in LPBF 316L stainless steel.
• Refined columnar and cellular austenitic grains with optimized molten pool morphology.
• Optimal parameters (190 W laser power, 700 mm/s) resulted in 762.83 MPa tensile strength and 253.07 HV0.2 hardness.
• Mechanical properties exceeded those of conventional cast 316L stainless steel.

Conclusions:

• Optimized LPBF parameters can produce 316L stainless steel with excellent density and refined microstructure.
• The superior mechanical properties make LPBF 316L stainless steel a promising candidate for biomedical implants.
• This technology holds potential for functional biomedical applications requiring high mechanical integrity and biocompatibility.