Microstructure Tailoring for High Strength Ti-6Al-4V without Alloying Elements through Optimized Preheating and Post-Heating Laser Scanning in Laser Powder Bed Fusion

Author:

Tanrikulu Ahmet Alptug12ORCID,Ganesh-Ram Aditya3ORCID,Hekmatjou Hamidreza3,Durlov Sadman Hafiz3ORCID,Salehin Md Najmus3,Amerinatanzi Amirhesam13ORCID

Affiliation:

1. Materials Science and Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA

2. Turkish Aerospace Industries, Ankara 06980, Turkey

3. Mechanical Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA

Abstract

Ti-6Al-4V with its eclectic array of excellent properties along with the combination of meticulous precision and flexibility offered by the laser powder bed fusion (LPBF) technology makes it a strong proponent in the field of engineering applications. As a substantial amount of research has paved the way to fabricate Ti-6AL-4V more effectively and efficiently, researchers are becoming more adventurous in finding out the optimal techniques to get better yields in terms of mechanical responses. This includes post-processing techniques i.e., heat treatment (HT) or introducing various alloying elements. Nevertheless, these techniques not only make the overall fabrication more expensive and time-consuming but also contradict the simplistic notion of additive manufacturing (AM) by imparting multistage fabrication without a considerable improvement overall. Here, we propose an innovative breakthrough in the field of Ti-6AL-4V fabrication with LPBF by introducing an in-situ approach to tackle the handicap mentioned in contemporary studies. By imparting multiple laser scans prior to and after the melting scan at each layer, a remarkable 37% improvement in yield strength (YS) can be achieved with higher elongation, while also maintaining a high relative density of around 99.99%.

Publisher

MDPI AG

Reference73 articles.

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3. Tanrikulu, A. (2017). Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys after Thermal Processing. [Master’s Thesis, Portland State University].

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