Deformation mechanisms in a precipitation-strengthened ferritic superalloy revealed by in situ neutron diffraction studies at elevated temperatures

Huang, Shenyan; Gao, Yanfei; An, Ke; Zheng, Lili; Wu, Wei; Teng, Zhenke; Liaw, Peter K

doi:10.1016/j.actamat.2014.09.053

Title: Deformation mechanisms in a precipitation-strengthened ferritic superalloy revealed by in situ neutron diffraction studies at elevated temperatures

Journal Article · Wed Oct 22 00:00:00 EDT 2014 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2014.09.053· OSTI ID:1162078

Huang, Shenyan ^[1]; Gao, Yanfei ^[2]; An, Ke ^[3]; Zheng, Lili ^[1]; Wu, Wei ^[1]; Teng, Zhenke ^[1]; Liaw, Peter K ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this study, the ferritic superalloy Fe–10Ni–6.5Al–10Cr–3.4Mo strengthened by ordered (Ni,Fe)Al B2-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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; FG26-09NT0008089; FE0005868

OSTI ID:: 1162078

Alternate ID(s):: OSTI ID: 1250965

Journal Information:: Acta Materialia, Vol. 83; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 51 works

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Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys Jones, R. D.; Di Gioacchino, F.; Lim, H. Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-26917-0	journal	June 2018
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