Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7973695 | Materials Science and Engineering: A | 2018 | 10 Pages |
Abstract
Low alloy carbon manganese (C-Mn) steel builds were fabricated using a wire based additive manufacturing system developed at Oak Ridge National Laboratory. Specimens were fabricated in the X,Y and Z direction and detailed mechanical testing was performed. The mechanical testing results showed a significant scatter in tensile ductility and significant variation in Charpy toughness. Further detailed microstructure characterization showed significant microstructural heterogeneity in builds fabricated in each direction. The scatter in mechanical properties was then rationalized based on the microstructural observations and the underlying changes in the local heat transfer conditions. The results indicate that when fabricating parts using C-Mn low alloy steel welds the process parameters and tool path should be chosen such that the cooling rate from 800 °C to 500 °C is greater than 30 s to avoid formation of martensite austenite (MA) phases, which leads to toughness reductions.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Niyanth Sridharan, Mark W. Noakes, Andrzej Nycz, Lonnie J. Love, Ryan R. Dehoff, Sudarsanam S. Babu,