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Title: On the toughness scatter in low alloy C-Mn steel samples fabricated using wire arc additive manufacturing

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. Lastly, 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.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 713; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Steel; Additive manufacturing; Mechanical properties; Characterization
OSTI Identifier:
1435321

Sridharan, Niyanth S., Noakes, Mark W., Nycz, Andrzej, Love, Lonnie J., Dehoff, Ryan R., and Babu, Sudarsanam Suresh. On the toughness scatter in low alloy C-Mn steel samples fabricated using wire arc additive manufacturing. United States: N. p., Web. doi:10.1016/j.msea.2017.11.101.
Sridharan, Niyanth S., Noakes, Mark W., Nycz, Andrzej, Love, Lonnie J., Dehoff, Ryan R., & Babu, Sudarsanam Suresh. On the toughness scatter in low alloy C-Mn steel samples fabricated using wire arc additive manufacturing. United States. doi:10.1016/j.msea.2017.11.101.
Sridharan, Niyanth S., Noakes, Mark W., Nycz, Andrzej, Love, Lonnie J., Dehoff, Ryan R., and Babu, Sudarsanam Suresh. 2017. "On the toughness scatter in low alloy C-Mn steel samples fabricated using wire arc additive manufacturing". United States. doi:10.1016/j.msea.2017.11.101.
@article{osti_1435321,
title = {On the toughness scatter in low alloy C-Mn steel samples fabricated using wire arc additive manufacturing},
author = {Sridharan, Niyanth S. and Noakes, Mark W. and Nycz, Andrzej and Love, Lonnie J. and Dehoff, Ryan R. and Babu, Sudarsanam Suresh},
abstractNote = {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. Lastly, 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.},
doi = {10.1016/j.msea.2017.11.101},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 713,
place = {United States},
year = {2017},
month = {12}
}