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Title: Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime strengthened alumina-forming austenitic alloys [Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime alumina-forming austenitic alloys]

Here, the goal of this work was to understand the effects of aging at 800 °C on the microstructures and mechanical properties of two recently-developed AFA stainless steels based on Fe-14Cr-32Ni-3Nb-3Al-2Ti (wt.%), one of which contained small additions of boron and carbon. To that end both the size distributions and growth kinetics of the B2, Laves phase, L1 2 precipitates present were quantified. While the lattice parameter, morphology, size and coarsening behavior of the L1 2 precipitates was the same in both AFA alloys, the B and C enhanced the grain boundary coverage by both Laves phase and B2-NiAl precipitates, but suppressed their coarsening. These interstitial additions also suppressed the formation of twins and discontinuous precipitation, which were observed in the B and C-free material. It is shown that the yield strength at 700 °C is largely controlled by the size of the L1 2 precipitates, with the largest strengthening effect obtained after aging for 2.4 h for both AFA alloys. Longer aging time led to a loss of strength mainly due to the coarsening of the L1 2 precipitates.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Dartmouth College, Hanover, NH (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Intermetallics
Additional Journal Information:
Journal Volume: 90; Journal Issue: C; Journal ID: ISSN 0966-9795
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; aging; alumina-forming austenitic stainless steels; boron; coarsening; gamma prime; grain boundaries; intermetallics; precipitation
OSTI Identifier:
1421962

Hu, Bin, Trotter, Geneva, Wang, Zhangwei, Chen, Si, Cai, Zhonghou, and Baker, Ian. Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime strengthened alumina-forming austenitic alloys [Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime alumina-forming austenitic alloys]. United States: N. p., Web. doi:10.1016/j.intermet.2017.06.011.
Hu, Bin, Trotter, Geneva, Wang, Zhangwei, Chen, Si, Cai, Zhonghou, & Baker, Ian. Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime strengthened alumina-forming austenitic alloys [Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime alumina-forming austenitic alloys]. United States. doi:10.1016/j.intermet.2017.06.011.
Hu, Bin, Trotter, Geneva, Wang, Zhangwei, Chen, Si, Cai, Zhonghou, and Baker, Ian. 2017. "Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime strengthened alumina-forming austenitic alloys [Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime alumina-forming austenitic alloys]". United States. doi:10.1016/j.intermet.2017.06.011. https://www.osti.gov/servlets/purl/1421962.
@article{osti_1421962,
title = {Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime strengthened alumina-forming austenitic alloys [Effect of boron and carbon addition on microstructure and mechanical properties of the aged gamma-prime alumina-forming austenitic alloys]},
author = {Hu, Bin and Trotter, Geneva and Wang, Zhangwei and Chen, Si and Cai, Zhonghou and Baker, Ian},
abstractNote = {Here, the goal of this work was to understand the effects of aging at 800 °C on the microstructures and mechanical properties of two recently-developed AFA stainless steels based on Fe-14Cr-32Ni-3Nb-3Al-2Ti (wt.%), one of which contained small additions of boron and carbon. To that end both the size distributions and growth kinetics of the B2, Laves phase, L12 precipitates present were quantified. While the lattice parameter, morphology, size and coarsening behavior of the L12 precipitates was the same in both AFA alloys, the B and C enhanced the grain boundary coverage by both Laves phase and B2-NiAl precipitates, but suppressed their coarsening. These interstitial additions also suppressed the formation of twins and discontinuous precipitation, which were observed in the B and C-free material. It is shown that the yield strength at 700 °C is largely controlled by the size of the L12 precipitates, with the largest strengthening effect obtained after aging for 2.4 h for both AFA alloys. Longer aging time led to a loss of strength mainly due to the coarsening of the L12 precipitates.},
doi = {10.1016/j.intermet.2017.06.011},
journal = {Intermetallics},
number = C,
volume = 90,
place = {United States},
year = {2017},
month = {7}
}