: The Effect of Heat Treatment on the Microstructure of a LENS Titanium Aluminum Vanadium Alloy Functionally Graded with Boron

Seely, D. W., Rhee, H., & Horstemeyer, M. (2018). : The Effect of Heat Treatment on the Microstructure of a LENS Titanium Aluminum Vanadium Alloy Functionally Graded with Boron. Proceedings of Material Science & Technology 2018. Columbus, OH.

Abstract

The LENS blown powder method for additive manufacturing (AM) of metals allows for the blending of two or more powders of different composition. The in-situ melting and mixing permits a controlled placement of a desired chemistry. Within the titanium alloys, boron additions up to one half weight percent have been shown to refine the initial beta BCC grain boundary size. However, mechanical properties such as initial yield and hardening behavior of as-deposited titanium AM parts are dominated by the fine alpha laths formed by phase transformation during the rapid cooling associated with the AM process. In this study we show the effect of post process heat treatment on the microstructure and mechanical properties of a Laser Engineered Net Shaping (LENS) fabricated titanium aluminum vanadium alloy that is functionally graded with up to one weight percent boron.