Many traditional approaches for strengthening steels typically come at the expense of useful ductility, a dilemma known as strength–ductility trade-off. New metallurgical processing might offer the possibility of overcoming this. Here we report that austenitic 316L stainless steels additively manufactured via a laser powder-bed-fusion technique exhibit a combination of yield strength and tensile ductility that surpasses that of conventional 316L steels. High strength is attributed to solidification-enabled cellular structures, low-angle grain boundaries, and dislocations formed during manufacturing, while high uniform elongation correlates to a steady and progressive work-hardening mechanism regulated by a hierarchically heterogeneous microstructure, with length scales spanning nearly six orders of magnitude. In addition, solute segregation along cellular walls and low-angle grain boundaries can enhance dislocation pinning and promote twinning. This work demonstrates the potential of additive manufacturing to create alloys with unique microstructures and high performance for structural applications.
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The authors thank S. Khairallah, T. Haxhimali, G. Guss, S. Burke, P. Alexander, B. El-dasher, W. King and C. Kamash for their experimental assistance and/or inspiring discussion. J. Li is acknowledged for his initial contribution to the model set-up. R.T.O. acknowledges support from the US Department of Energy, Basic Energy Sciences, Materials Science and Engineering Division, under Contract No. DEAC02-07CH11358. This work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under contract No. DE-AC52-07NA27344. ChemiSTEM was performed at the OSU Electron Microscope Facility which is supported by NSF MRI grant number 1040588 and by the Murdock Charitable Trust and the Oregon Nanoscience and Micro-Technologies Institute. This research used resources of the Advanced Photon Source, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
The authors declare no competing financial interests.
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Wang, Y., Voisin, T., McKeown, J. et al. Additively manufactured hierarchical stainless steels with high strength and ductility. Nature Mater 17, 63–71 (2018). https://doi.org/10.1038/nmat5021
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