About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Systematic Approach to Determining Ideal Process Parameters for Low Alloy Steels in Directed Energy Deposition |
Author(s) |
Jose Loli, Bryan Webler, Maarten de Boer, Jack Beuth |
On-Site Speaker (Planned) |
Jose Loli |
Abstract Scope |
Determining proper processing parameters, especially layer heights and hatch spacings, in directed energy deposition (DED) is a challenge that is typically solved through trial and error. In this work, we describe a methodology to systematically map out the ideal process window as a function of power, scan speed, and powder feed rate for 4130 and 4340 steel using the Trumpf TruLaser Cell 3000 DED system. Initial starting parameters for a single material are chosen by using a combination of finite element-based and analytical thermal models. Single laser tracks are deposited and analyzed to determine (i) substrate re-melt ratios, (ii) percent powder capture in the melt pool, and (iii) corresponding layer height and hatch spacing estimates for subsequent single-layer pad and multi-layer block builds. Thermal simulations are also done to estimate adequate cooling times for taller structures. The subsequent multi-layer builds are characterized to further refine the process space. |