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Search Publications by: Richard E. Ricker (Assoc)

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Displaying 1 - 25 of 52

Transient Laser Energy Absorption, Co-axial Melt Pool Monitoring, and Relationship to Melt Pool Morphology

August 16, 2020
Author(s)
Brandon M. Lane, Ivan Zhirnov, Sergey Mekhontsev, Steven E. Grantham, Richard E. Ricker, Santosh Rauniyar, Kevin Chou
Many recent and ongoing studies into the complex melt pool physics during laser powder bed fusion (LPBF) metal additive manufacturing (AM) process measure various aspects of energy transport surrounding the laser-induced melt pool, with focus on laser

Outcomes and Conclusions from the 2018 AM-Bench Measurements, Challenge Problems, Modeling Submissions, and Conference

February 13, 2020
Author(s)
Lyle E. Levine, Brandon M. Lane, Jarred C. Heigel, Kalman D. Migler, Mark R. Stoudt, Thien Q. Phan, Richard E. Ricker, Maria Strantza, Michael R. Hill, Fan Zhang, Jonathan E. Seppala, Edward J. Garboczi, Erich D. Bain, Daniel Cole, Andrew J. Allen, Jason C. Fox, Carelyn E. Campbell
The Additive Manufacturing Benchmark Test Series (AM-Bench) was established to provide rigorous measurement test data for validating additive manufacturing (AM) simulations for a broad range of AM technologies and material systems. AM-Bench includes

Measurements of Melt Pool Geometry and Cooling Rates of Individual Laser Traces on IN625 Bare Plates

February 5, 2020
Author(s)
Brandon M. Lane, Jarred C. Heigel, Richard E. Ricker, Ivan Zhirnov, Vladimir Khromchenko, Jordan S. Weaver, Thien Q. Phan, Mark R. Stoudt, Sergey Mekhontsev, Lyle E. Levine
The complex physical nature of the laser powder bed fusion (LPBF) process warrants use of multiphysics computational simulations to predict or design optimal operating parameters or resultant part qualities such as microstructure or defect concentration

Topographic Measurement of Individual Laser Tracks in Alloy 625 Bare Plates

October 10, 2019
Author(s)
Richard E. Ricker, Jarred C. Heigel, Brandon M. Lane, Ivan Zhirnov, Lyle E. Levine
Additive manufacturing (AM) combines all of the complexities of materials processing and manufacturing into a single process. The digital revolution made this combination possible, but the commercial viability of these technologies for critical parts may

Single Track Melt Pool Measurements and Microstructures in Inconel 625

February 20, 2018
Author(s)
Supriyo Ghosh, Li Ma, Lyle E. Levine, Richard E. Ricker, Mark R. Stoudt, Jarred C. Heigel, Jonathan E. Guyer
We use single track laser melting experiments and simulations on Inconel 625 to estimate the dimensions and microstructures of the resulting melt pools. Our work is based on a design-of- experiments approach which uses multiple laser power and scan speed

MSEL Sustainability Seminar Series (2009)

May 15, 2011
Author(s)
Winnie K. Wong-Ng, Kathryn L. Beers, Richard E. Ricker, Martin L. Green
An MSEL Sustainability Seminar Series took place in 2009, aimed at the following goals: (1) to introduce this important subject matter to our staff and (2) to learn and discuss the metrology needs for materials for sustainability applications. Since

Measurement Needs in Sustainability and Materials Performance

August 24, 2010
Author(s)
Richard E. Ricker
Sustainability is an attractive approach to environmental stewardship because it recognizes the importance of continued profitability in maintaining the environment and advancing society. However, the ability of this approach to actually provide benefit

Interim Report on the Examination of Corrosion Damage in Homes Constructed with Imported Wallboard: Examination of Samples Received September 28, 2009

June 30, 2010
Author(s)
David J. Pitchure, Richard E. Ricker, Maureen E. Williams, Sandra W. Claggett
Since many household systems are fabricated with metallic materials, changes to the household environment that accelerate corrosion will increase the failure rates of these systems. Recently, increased failure rates have been reported in homes constructed

NIST Workshop on Materials Test Procedures for Hydrogen Pipelines

September 1, 2007
Author(s)
Thomas A. Siewert, Joseph D. McColskey, Richard E. Ricker
The Materials Reliability and Metallurgy Divisions have expanded their efforts to advance the technology for the construction, repair, and inspection of pipelines. One key factor is to identify and prioritize the research needs of the pipeline community