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Nano-Mechanical Behavior of Ti6Al4V Alloy Manufactured Using Laser Powder Bed Fusion
David Liović1, Marina Franulović1, Ervin Kamenar1
1Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia.
Materials (Basel, Switzerland)
|June 28, 2023
Summary
Annealing heat treatment affects the nano-mechanical properties and creep behavior of laser powder bed fusion Ti6Al4V alloy. While increasing nano-hardness, annealing reduces creep resistance due to dislocation motion.
Area of Science:
- Materials Science
- Additive Manufacturing
- Mechanical Engineering
Background:
- Laser powder bed fusion (L-PBF) is a key additive manufacturing technique for Ti6Al4V.
- The nano-mechanical behavior and creep of L-PBF Ti6Al4V after heat treatment are not well understood.
- Understanding these properties is crucial for optimizing L-PBF process parameters and material applications.
Purpose of the Study:
- To investigate the impact of annealing heat treatment on the mechanical properties, strain-rate sensitivity, and creep behavior of L-PBF Ti6Al4V.
- To analyze the influence of L-PBF laser power-scanning speed combinations on the mechanical properties of annealed Ti6Al4V specimens.
- To elucidate the dominant deformation mechanisms during creep in both as-built and annealed L-PBF Ti6Al4V.
Main Methods:
- Microstructural analysis of Ti6Al4V alloy produced by L-PBF.
- Nano-indentation testing to determine nano-hardness and Young's modulus.
- Creep testing at elevated temperatures to assess strain-rate sensitivity and deformation mechanisms.
- Varied L-PBF process parameters (laser power, scanning speed) for annealed specimens.
Main Results:
- High laser power in L-PBF processing leads to increased nano-hardness even after annealing.
- A linear relationship between Young's modulus and nano-hardness was established for annealed Ti6Al4V.
- Dislocation motion was identified as the primary creep deformation mechanism in both as-built and annealed L-PBF Ti6Al4V.
- Annealing heat treatment was found to decrease the creep resistance of L-PBF Ti6Al4V.
Conclusions:
- Annealing heat treatment significantly alters the nano-mechanical properties and creep performance of L-PBF Ti6Al4V.
- Despite benefits like increased nano-hardness, annealing compromises creep resistance, necessitating careful process parameter selection.
- This study provides critical insights into the microstructure-property relationships of L-PBF Ti6Al4V, guiding future applications and process optimization.
