Publications

Displaying 1 - 11 of 11

Correlation between keyhole geometry and reflected laser light distribution in laser-based manufacturing

October 2, 2023

Author(s)

David Deisenroth, Sergey Mekhontsev, Wenda Tan, Wenkang Huang

This study investigated the correlation between the keyhole geometry and reflected laser light distribution during laser-based manufacturing processes. An "imaging dome" system was developed to capture the distribution of the reflected laser light on a

In-Process Thermography of Metal Additive Manufacturing Processes

June 30, 2023

Author(s)

Brandon Lane, David Deisenroth

Assessing the influence of non-uniform gas speed on the melt pool depth in laser powder bed fusion additive manufacturing

May 3, 2023

Author(s)

Jordan Weaver, Alec Schlenoff, David Deisenroth, Shawn P. Moylan

Purpose: This paper aims to investigate the influence of the non-uniform gas speed across the build area on the melt pool depth during laser powder bed fusion. The study focuses on whether non-uniform gas speed is a source of process variation within an

On the Fidelity of the Scaling Laws for Melt Pool Depth Analysis During Laser Powder Bed Fusion

December 27, 2022

Author(s)

Mehdi Naderi, Jordan Weaver, David Deisenroth, Nagaraja Iyyer, Raymond McCauley

In additive manufacturing, the part quality is highly dependent on process parameters. The morphology of the melt pool (depth and width) is highly affected by process parameter selection. Available scaling laws more or less overestimate or underestimate

Inert Gas Flow Speed Measurements in Laser Powder Bed Fusion Additive Manufacturing

October 19, 2021

Author(s)

Jordan Weaver, Alec Schlenoff, David Deisenroth, Shawn P. Moylan

Laser powder bed fusion (LPBF) is an additive manufacturing technology that uses a laser to selectively melt powder feedstock to build parts in a layer-by-layer process. For metals-based LBPF additive manufacturing, the interaction of the laser and powder

Toward specification of complex additive manufactured metal surfaces for optimum heat transfer

September 23, 2021

Author(s)

Kuldeep Mandloi, Christopher Evans, Jason Fox, Harish Cherukuri, Jimmie Miller, Angela Allen, David Deisenroth, Alkan Donmez

Metal additive manufacturing (AM) offers the possibility of incorporating cooling channels into components in high-temperature applications. Additionally, it has the prospect of optimizing cooling channel geometry unconstrained by geometric limitations of

Measurement Uncertainty of Surface Temperature Distributions for Laser Powder Bed Fusion Processes

August 10, 2021

Author(s)

David Deisenroth, Sergey Mekhontsev, Brandon Lane, Leonard M. Hanssen, Ivan Zhirnov, Vladimir Khromchenko, Steven Grantham, Daniel Cardenas-Garcia, Alkan Donmez

This paper describes advances in measuring the characteristic spatial distribution of surface temperature and emissivity during laser-metal interaction under conditions relevant for laser powder bed fusion (LPBF) additive manufacturing processes. Detailed

EFFECTS OF SHIELD GAS FLOW ON MELTPOOL VARIABILITY AND SIGNATURE IN SCANNED LASER MELTING

January 14, 2021

Author(s)

David Deisenroth, Jorge Neira, Jordan Weaver, Ho Yeung

In laser powder bed fusion metal additive manufacturing, insufficient shield gas flow allows accumulation of condensate and ejecta above the build plane and in the beam path. These process byproducts are associated with beam obstruction, attenuation, and

Development of Computational Framework for Titanium Alloy Phase Transformation Prediction in Laser Powder-bed Direct Energy Additive Manufacturing

October 16, 2020

Author(s)

Zhi Liang, Ivan Zhirnov, Fan Zhang, Kevontrez K. Jones, David C. Deisenroth, Maureen E. Williams, Ursula R. Kattner, Kil-Won Moon, Wing-Kam Liu, Brandon M. Lane, Carelyn E. Campbell

In conjunction with bare metal single laser track validation experiments, a computational framework is proposed to accelerate the design and development of new additive manufacturing (AM) specific alloys. Specifically, Additive Manufacturing-Computational

High temperature reflectometer for spatially resolved spectral directional emissivity of laser powder bed fusion processes

August 26, 2020

Author(s)

David C. Deisenroth, Leonard M. Hanssen, Sergey Mekhontsev

Additive manufacturing involving layer-wise selective laser melting of a powder material, or laser powder bed fusion (LPBF), is a fast-growing industry. At the Additive Manufacturing Metrology Testbed (AMMT) at the United States National Institute of

Measurement of mass loss, absorbed energy, and time-resolved reflected power for laser powder bed fusion

March 2, 2020

Author(s)

David C. Deisenroth, Sergey Mekhontsev, Brandon M. Lane

Laser powder bed fusion processes are driven by scanned, focused laser beams. Along with selectively melting the metal powder, laser energy may be converted and transferred through physical mechanisms such as reflection from the metal surface, heat

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