Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates
Abstract
There have been numerous efforts to develop creep-resistant materials strengthened by incoherent particles at high temperatures and stresses in response to future energy needs for steam turbines in thermal-power plants. However, the microstructural instability of the incoherent-particle-strengthened ferritic steels limits their application to temperatures below 900 K. Here, we report a novel ferritic alloy with the excellent creep resistance enhanced by coherent hierarchical precipitates, using the integrated experimental (transmission-electron microscopy/scanning-transmission-electron microscopy, in-situ neutron diffraction, and atom-probe tomography) and theoretical (crystal-plasticity finite-element modeling) approaches. This alloy is strengthened by nano-scaled L21-Ni2TiAl (Heusler phase)-based precipitates, which themselves contain coherent nano-scaled B2 zones. These coherent hierarchical precipitates are uniformly distributed within the Fe matrix. Our hierarchical structure material exhibits the superior creep resistance at 973 K in terms of the minimal creep rate, which is four orders of magnitude lower than that of conventional ferritic steels. These results provide a new alloy-design strategy using the novel concept of hierarchical precipitates and the fundamental science for developing creep-resistant ferritic alloys. In conclusion, the present research will broaden the applications of ferritic alloys to higher temperatures.
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States)
- Tohoku Univ., Sendai (Japan)
- Northwestern Univ., Evanston, IL (United States)
- Univ. of California, Berkeley, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- City Univ. of Hong Kong (Hong Kong)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1259493
- Alternate Identifier(s):
- OSTI ID: 1265957; OSTI ID: 1321756
- Report Number(s):
- LA-UR-15-22106
Journal ID: ISSN 2045-2322; srep16327
- Grant/Contract Number:
- AC52-06NA-25396; FE0005868; 09NT0008089; FE-0011194; FE-0024054; AC05-00OR22725; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 5; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; mechanical properties; metals and alloys
Citation Formats
Song, Gian, Sun, Zhiqian, Li, Lin, Xu, Xiandong, Rawlings, Michael, Liebscher, Christian H., Clausen, Bjørn, Poplawsky, Jonathan, Leonard, Donovan N., Huang, Shenyan, Teng, Zhenke, Liu, Chain T., Asta, Mark D., Gao, Yanfei, Dunand, David C., Ghosh, Gautam, Chen, Mingwei, Fine, Morris E., and Liaw, Peter K. Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates. United States: N. p., 2015.
Web. doi:10.1038/srep16327.
Song, Gian, Sun, Zhiqian, Li, Lin, Xu, Xiandong, Rawlings, Michael, Liebscher, Christian H., Clausen, Bjørn, Poplawsky, Jonathan, Leonard, Donovan N., Huang, Shenyan, Teng, Zhenke, Liu, Chain T., Asta, Mark D., Gao, Yanfei, Dunand, David C., Ghosh, Gautam, Chen, Mingwei, Fine, Morris E., & Liaw, Peter K. Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates. United States. https://doi.org/10.1038/srep16327
Song, Gian, Sun, Zhiqian, Li, Lin, Xu, Xiandong, Rawlings, Michael, Liebscher, Christian H., Clausen, Bjørn, Poplawsky, Jonathan, Leonard, Donovan N., Huang, Shenyan, Teng, Zhenke, Liu, Chain T., Asta, Mark D., Gao, Yanfei, Dunand, David C., Ghosh, Gautam, Chen, Mingwei, Fine, Morris E., and Liaw, Peter K. Mon .
"Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates". United States. https://doi.org/10.1038/srep16327. https://www.osti.gov/servlets/purl/1259493.
@article{osti_1259493,
title = {Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates},
author = {Song, Gian and Sun, Zhiqian and Li, Lin and Xu, Xiandong and Rawlings, Michael and Liebscher, Christian H. and Clausen, Bjørn and Poplawsky, Jonathan and Leonard, Donovan N. and Huang, Shenyan and Teng, Zhenke and Liu, Chain T. and Asta, Mark D. and Gao, Yanfei and Dunand, David C. and Ghosh, Gautam and Chen, Mingwei and Fine, Morris E. and Liaw, Peter K.},
abstractNote = {There have been numerous efforts to develop creep-resistant materials strengthened by incoherent particles at high temperatures and stresses in response to future energy needs for steam turbines in thermal-power plants. However, the microstructural instability of the incoherent-particle-strengthened ferritic steels limits their application to temperatures below 900 K. Here, we report a novel ferritic alloy with the excellent creep resistance enhanced by coherent hierarchical precipitates, using the integrated experimental (transmission-electron microscopy/scanning-transmission-electron microscopy, in-situ neutron diffraction, and atom-probe tomography) and theoretical (crystal-plasticity finite-element modeling) approaches. This alloy is strengthened by nano-scaled L21-Ni2TiAl (Heusler phase)-based precipitates, which themselves contain coherent nano-scaled B2 zones. These coherent hierarchical precipitates are uniformly distributed within the Fe matrix. Our hierarchical structure material exhibits the superior creep resistance at 973 K in terms of the minimal creep rate, which is four orders of magnitude lower than that of conventional ferritic steels. These results provide a new alloy-design strategy using the novel concept of hierarchical precipitates and the fundamental science for developing creep-resistant ferritic alloys. In conclusion, the present research will broaden the applications of ferritic alloys to higher temperatures.},
doi = {10.1038/srep16327},
journal = {Scientific Reports},
number = ,
volume = 5,
place = {United States},
year = {Mon Nov 09 00:00:00 EST 2015},
month = {Mon Nov 09 00:00:00 EST 2015}
}
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