4.6 Article

Microstructural Tailoring and Enhancement in Compressive Properties of Additive Manufactured Ti-6Al-4V Alloy through Heat Treatment

Journal

MATERIALS
Volume 14, Issue 19, Pages -

Publisher

MDPI
DOI: 10.3390/ma14195524

Keywords

additive manufacturing; powder metallurgy; annealing; implants; biomaterials; titanium; selective laser melting

Funding

  1. Technology Development Program - Ministry of SMEs and Startups (MSS, Korea) [S2866928]
  2. Korea Technology & Information Promotion Agency for SMEs (TIPA) [S2866928] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Ti-6Al-4V alloy was prepared using selective laser melting (SLM) method and subjected to heat treatment in this study. The results showed that heat treated samples exhibited a reduction in defects, a change in morphology of the alpha'-martensite, a significant decrease in strength, but an improvement in elongation. An optimal combination of strength and elongation was found at 900°C.
Among laser additive manufacturing, selective laser melting (SLM) is one of the most popular methods to produce 3D printing products. The SLM process creates a product by selectively dissolving a layer of powder. However, due to the layerwise printing of metal powders, the initial microstructure is fully acicular alpha '-martensitic, and mechanical properties of the resultant product are often compromised. In this study, Ti-6Al-4V alloy was prepared using SLM method. The effect of heat treatment was carried out on as-built SLM Ti-6Al-4V alloy from 650-1000 C-circle to study respective changes in the morphology of alpha/alpha '-martensite and mechanical properties. The phase transition temperature was also analyzed through differential thermal analysis (DTA), and the microstructural studies were undertaken by optical microscopy (OM) and scanning electron microscopy (SEM). The mechanical properties were assessed by microhardness and compressive tests before and after heat treatment. The results showed that heat treated samples resulted in a reduction in interior defects and pores and turned the morphology of the alpha '-martensite into a lamellar (alpha + beta) structure. The strength was significantly reduced after heat treatment, but the elongation was improved due to the reduction in columnar alpha '-martensite phase. An optimum set of strength and elongation was found at 900 C-circle.

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