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

Sridharan, Niyanth S.; Noakes, Mark W.; Nycz, Andrzej; Love, Lonnie J.; Dehoff, Ryan R.; Babu, Sudarsanam Suresh

doi:10.1016/j.msea.2017.11.101

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

Journal Article · Tue Dec 05 23:00:00 EST 2017 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI: https://doi.org/10.1016/j.msea.2017.11.101 · OSTI ID:1435321

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^[1]; Babu, Sudarsanam Suresh ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1435321

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 713; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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The Hardness of Additively Manufactured Alloys Zuback, J. S.; DebRoy, T. Materials, Vol. 11, Issue 11 https://doi.org/10.3390/ma11112070	journal	October 2018
Microstructural evolution and mechanical properties of a low-carbon low-alloy steel produced by wire arc additive manufacturing Rafieazad, Mehran; Ghaffari, Mahya; Vahedi Nemani, Alireza The International Journal of Advanced Manufacturing Technology, Vol. 105, Issue 5-6 https://doi.org/10.1007/s00170-019-04393-8	journal	October 2019
Correlation of Microstructure and Mechanical Properties of Metal Big Area Additive Manufacturing Shassere, Benjamin; Nycz, Andrzej; Noakes, Mark Applied Sciences, Vol. 9, Issue 4 https://doi.org/10.3390/app9040787	journal	February 2019
The Hardness of Additively Manufactured Alloys Zuback, J. S.; DebRoy, T. Materials, Vol. 11, Issue 11 https://doi.org/10.3390/ma11112070	journal	October 2018

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