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Title: Deformation mechanisms in a precipitation-strengthened ferritic super alloy revealed by in situ neutron dffraction studies at elevated temperatures

Abstract

The ferritic superalloy Fe–10Ni–6.5Al–10Cr–3.4Mo strengthened by ordered (Ni,Fe)AlB2-type precipitates is a candidate material for ultra-supercritical steam turbine applications above 923 K. Despite earlier success in improving its room-temperature ductility, the creep resistance of this material at high temperatures needs to be further improved, which requires a fundamental understanding of the high-temperature deformation mechanisms at the scales of individual phases and grains. In situ neutron diffraction has been utilized to investigate the lattice strain evolution and the microscopic load-sharing mechanisms during tensile deformation of this ferritic superalloy at elevated temperatures. Finite-element simulations based on the crystal plasticity theory are employed and compared with the experimental results, both qualitatively and quantitatively. Based on these interphase and intergranular load-partitioning studies, it is found that the deformation mechanisms change from dislocation slip to those related to dislocation climb, diffusional flow and possibly grain boundary sliding, below and above 873 K, respectively. Insights into microstructural design for enhancing creep resistance are also discussed.

Authors:
 [1];  [2];  [3];  [1];  [1];  [1];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Defect Physics in Structural Materials (CDP)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1210542
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Acta Mater.
Additional Journal Information:
Journal Volume: 83; Related Information: CDP partners with Oak Ridge National Laboratory (lead); Ames Laboratory; University of California, Berkeley; Carnegie Mellon University; University of Georgia; University of Illinois, Urbana-Champaign; Ohio State University; University of Tennessee
Country of Publication:
United States
Language:
English
Subject:
nuclear (including radiation effects), defects, mechanical behavior, spin dynamics, materials and chemistry by design

Citation Formats

Huang, Shenyan, Gao, Yanfei, An, Ke, Zheng, Lili, Teng, Zhenke, Wu, Wei, and Liaw, Peter K. Deformation mechanisms in a precipitation-strengthened ferritic super alloy revealed by in situ neutron dffraction studies at elevated temperatures. United States: N. p., 2015. Web. doi:10.1016/j.actamat.2014.09.053.
Huang, Shenyan, Gao, Yanfei, An, Ke, Zheng, Lili, Teng, Zhenke, Wu, Wei, & Liaw, Peter K. Deformation mechanisms in a precipitation-strengthened ferritic super alloy revealed by in situ neutron dffraction studies at elevated temperatures. United States. https://doi.org/10.1016/j.actamat.2014.09.053
Huang, Shenyan, Gao, Yanfei, An, Ke, Zheng, Lili, Teng, Zhenke, Wu, Wei, and Liaw, Peter K. 2015. "Deformation mechanisms in a precipitation-strengthened ferritic super alloy revealed by in situ neutron dffraction studies at elevated temperatures". United States. https://doi.org/10.1016/j.actamat.2014.09.053.
@article{osti_1210542,
title = {Deformation mechanisms in a precipitation-strengthened ferritic super alloy revealed by in situ neutron dffraction studies at elevated temperatures},
author = {Huang, Shenyan and Gao, Yanfei and An, Ke and Zheng, Lili and Teng, Zhenke and Wu, Wei and Liaw, Peter K.},
abstractNote = {The ferritic superalloy Fe–10Ni–6.5Al–10Cr–3.4Mo strengthened by ordered (Ni,Fe)AlB2-type precipitates is a candidate material for ultra-supercritical steam turbine applications above 923 K. Despite earlier success in improving its room-temperature ductility, the creep resistance of this material at high temperatures needs to be further improved, which requires a fundamental understanding of the high-temperature deformation mechanisms at the scales of individual phases and grains. In situ neutron diffraction has been utilized to investigate the lattice strain evolution and the microscopic load-sharing mechanisms during tensile deformation of this ferritic superalloy at elevated temperatures. Finite-element simulations based on the crystal plasticity theory are employed and compared with the experimental results, both qualitatively and quantitatively. Based on these interphase and intergranular load-partitioning studies, it is found that the deformation mechanisms change from dislocation slip to those related to dislocation climb, diffusional flow and possibly grain boundary sliding, below and above 873 K, respectively. Insights into microstructural design for enhancing creep resistance are also discussed.},
doi = {10.1016/j.actamat.2014.09.053},
url = {https://www.osti.gov/biblio/1210542}, journal = {Acta Mater.},
number = ,
volume = 83,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}

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Works referencing / citing this record:

Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates
journal, November 2015


Isothermal Oxidation Behaviour of 69.5Fe-14Ni-9Al-7.5Cr Alloy at High Temperatures
journal, February 2019


A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory
journal, September 2018


Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys
journal, June 2018


Characterization of Graphene/Cu Composites Prepared by CVD and SPS
book, January 2019


Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys.
text, January 2018