Experimental Research on Variable Parameter Forming Process for Forming Specimen of TC4 Titanium Alloy by Selective...

Area of Science:

• Materials Science
• Additive Manufacturing
• Metallurgy

Background:

• Selective Laser Melting (SLM) is a key additive manufacturing technique.
• Optimizing TC4 alloy properties requires precise control over microstructure.
• Existing quantitative parameter forming processes (QPFP) have limitations.

Purpose of the Study:

• To investigate the impact of Variable Parameter Forming Process (VPFP) on TC4 specimens.
• To evaluate VPFP's effect on surface morphology, tensile properties, and microstructure.
• To establish a new method for SLM-based material forming.

Main Methods:

• Designed a VPFP test program based on QPFP for TC4 specimens.
• Analyzed surface morphology, tensile properties, and microstructural characteristics.
• Varied laser power across six hierarchies (300 W-260 W) during VPFP.

Main Results:

• VPFP resulted in improved surface morphology and tensile properties.
• Specimen density reached 99.7% with reduced internal void volume.
• Tensile strength reached 1185.214 MPa; secondary acicular martensite α' decreased.
• Microstructural changes included shorter primary α' laths and narrower columnar β phases.

Conclusions:

• VPFP offers a novel approach to SLM, surpassing traditional uniform parameter methods.
• The study provides crucial data and theoretical support for advanced SLM process development.
• VPFP enhances TC4 microstructure and mechanical performance, paving the way for optimized additive manufacturing.