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Metallurgical and Mechanical Evaluation of 4340 Steel Produced by Direct Metal Laser Sintering

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An Erratum to this article was published on 03 April 2015

Abstract

Direct metal laser sintering (DMLS) was used to produce high-strength low-alloy 4340 steel specimens. Mechanical and metallurgical analyses were performed on the specimens to determine the samples with the highest strengths and the least porosity. The optimal process parameters were thus defined based on the corresponding experimental conditions. Additionally, the effects of fabricating specimens with both virgin and recycled powders were studied. Scanning electron microscopy and electron-dispersive spectroscopy were performed on both types of powders to determine the starting morphology and composition. The initial tensile results are promising, suggesting that DMLS can produce specimens equal in strength to wrought materials. However, there is evidence of cracking on several of the heat-treated tensile specimens that is unexplained. Several theories point to disturbances in the build chamber environment that went undetected while the specimens were being fabricated.

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Acknowledgement

Elias Jelis acknowledges with thanks the award of the SMART Fellowship by the US Department of Defense.

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Authors and Affiliations

  1. U.S. Army ARDEC, Picatinny, NJ, 07806, USA

    Elias Jelis, Matthew Clemente, Stacey Kerwien & Michael R. Hespos

  2. Interdisciplinary Program in Materials Science & Engineering, New Jersey Institute of Technology, Newark, NJ, 07102, USA

    Elias Jelis & Nuggehalli M. Ravindra

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  1. Elias Jelis
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  2. Matthew Clemente
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  3. Stacey Kerwien
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  4. Nuggehalli M. Ravindra
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  5. Michael R. Hespos
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Correspondence to Nuggehalli M. Ravindra.

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Jelis, E., Clemente, M., Kerwien, S. et al. Metallurgical and Mechanical Evaluation of 4340 Steel Produced by Direct Metal Laser Sintering. JOM 67, 582–589 (2015). https://doi.org/10.1007/s11837-014-1273-8

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  • DOI: https://doi.org/10.1007/s11837-014-1273-8

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