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Title: Additively manufactured hierarchical stainless steels with high strength and ductility

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [2];  [3];  [1];  [4];  [5];  [1];  [1];  [1];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
  2. Georgia Inst. of Technology, Atlanta, GA (United States). Woodruff School of Mechanical Engineering
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Engineering Division
  4. Ames Lab., Ames, IA (United States). Division of Materials Sciences and Engineering
  5. Oregon State Univ., Corvallis, OR (United States). School of Mechanical, Industrial and Manufacturing Engineering
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1418906
Report Number(s):
LLNL-JRNL-736774
Journal ID: ISSN 1476-1122
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 17; Journal Issue: 1; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Mechanical properties; Mechanical engineering

Citation Formats

Wang, Y. Morris, Voisin, Thomas, McKeown, Joseph T., Ye, Jianchao, Calta, Nicholas P., Li, Zan, Zeng, Zhi, Zhang, Yin, Chen, Wen, Roehling, Tien Tran, Ott, Ryan T., Santala, Melissa K., Depond, Philip J., Matthews, Manyalibo J., Hamza, Alex V., and Zhu, Ting. Additively manufactured hierarchical stainless steels with high strength and ductility. United States: N. p., 2017. Web. doi:10.1038/nmat5021.
Wang, Y. Morris, Voisin, Thomas, McKeown, Joseph T., Ye, Jianchao, Calta, Nicholas P., Li, Zan, Zeng, Zhi, Zhang, Yin, Chen, Wen, Roehling, Tien Tran, Ott, Ryan T., Santala, Melissa K., Depond, Philip J., Matthews, Manyalibo J., Hamza, Alex V., & Zhu, Ting. Additively manufactured hierarchical stainless steels with high strength and ductility. United States. doi:10.1038/nmat5021.
Wang, Y. Morris, Voisin, Thomas, McKeown, Joseph T., Ye, Jianchao, Calta, Nicholas P., Li, Zan, Zeng, Zhi, Zhang, Yin, Chen, Wen, Roehling, Tien Tran, Ott, Ryan T., Santala, Melissa K., Depond, Philip J., Matthews, Manyalibo J., Hamza, Alex V., and Zhu, Ting. Mon . "Additively manufactured hierarchical stainless steels with high strength and ductility". United States. doi:10.1038/nmat5021.
@article{osti_1418906,
title = {Additively manufactured hierarchical stainless steels with high strength and ductility},
author = {Wang, Y. Morris and Voisin, Thomas and McKeown, Joseph T. and Ye, Jianchao and Calta, Nicholas P. and Li, Zan and Zeng, Zhi and Zhang, Yin and Chen, Wen and Roehling, Tien Tran and Ott, Ryan T. and Santala, Melissa K. and Depond, Philip J. and Matthews, Manyalibo J. and Hamza, Alex V. and Zhu, Ting},
abstractNote = {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.},
doi = {10.1038/nmat5021},
journal = {Nature Materials},
number = 1,
volume = 17,
place = {United States},
year = {Mon Oct 30 00:00:00 EDT 2017},
month = {Mon Oct 30 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 30, 2018
Publisher's Version of Record

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Cited by: 1 work
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