Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing
In recent years, the development of nuclear grade FeCrAl-based alloys with enhanced accident tolerance has been carried out for light water reactor (LWR) fuel cladding to serve as a substitute for zirconium-based alloys. To achieve excellent microstructure stability and mechanical properties, the co...
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doaj-9c93cd10518846c3b5a0dc3449cb48862020-11-25T02:03:36ZengMDPI AGMaterials1996-19442019-09-011218293910.3390/ma12182939ma12182939Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical ProcessingJiyun Zheng0Yuzhen Jia1Peinan Du2Hui Wang3Qianfu Pan4Yiyong Zhang5Chaohong Liu6Ruiqian Zhang7Shaoyu Qiu8Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaScience and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, ChinaIn recent years, the development of nuclear grade FeCrAl-based alloys with enhanced accident tolerance has been carried out for light water reactor (LWR) fuel cladding to serve as a substitute for zirconium-based alloys. To achieve excellent microstructure stability and mechanical properties, the control of precipitation particles is critical for application of FeCrAl-based alloys. In this paper, the effect of thermomechanical processing on the microstructure and precipitation behavior of hot-rolled FeCrAl alloy plates was examined. After hot rolling, the FeCrAl alloy plates had typical deformation textures. The rolling direction (RD) orientation gradually rotated from <100> to <110> along with increasing reduction. Shear bands and cell structures were formed in the matrix, and the former acted as preferable nucleation sites for crystallization. Improved deformation helped to produce strain-induced precipitation. The plate with 83% reduction had the most homogeneous and finest precipitation particles. Identification results by TEM indicated that the Laves precipitation was of the Fe<sub>2</sub>Nb-type crystal structure type, with impurities including Mo, Cr, and Si. The plate with uniform Laves particles displayed favorable heat stability after a long period of aging at 800 °C. The microstructure evolution of the aged sample was also observed. The deformation microstructure and the strain-induced precipitation mechanism of FeCrAl alloys are discussed.https://www.mdpi.com/1996-1944/12/18/2939FeCrAl alloyLaves phaseprecipitation particlestrain-induced precipitation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jiyun Zheng Yuzhen Jia Peinan Du Hui Wang Qianfu Pan Yiyong Zhang Chaohong Liu Ruiqian Zhang Shaoyu Qiu |
spellingShingle |
Jiyun Zheng Yuzhen Jia Peinan Du Hui Wang Qianfu Pan Yiyong Zhang Chaohong Liu Ruiqian Zhang Shaoyu Qiu Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing Materials FeCrAl alloy Laves phase precipitation particle strain-induced precipitation |
author_facet |
Jiyun Zheng Yuzhen Jia Peinan Du Hui Wang Qianfu Pan Yiyong Zhang Chaohong Liu Ruiqian Zhang Shaoyu Qiu |
author_sort |
Jiyun Zheng |
title |
Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing |
title_short |
Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing |
title_full |
Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing |
title_fullStr |
Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing |
title_full_unstemmed |
Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing |
title_sort |
control of laves precipitation in a fecral-based alloy through severe thermomechanical processing |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-09-01 |
description |
In recent years, the development of nuclear grade FeCrAl-based alloys with enhanced accident tolerance has been carried out for light water reactor (LWR) fuel cladding to serve as a substitute for zirconium-based alloys. To achieve excellent microstructure stability and mechanical properties, the control of precipitation particles is critical for application of FeCrAl-based alloys. In this paper, the effect of thermomechanical processing on the microstructure and precipitation behavior of hot-rolled FeCrAl alloy plates was examined. After hot rolling, the FeCrAl alloy plates had typical deformation textures. The rolling direction (RD) orientation gradually rotated from <100> to <110> along with increasing reduction. Shear bands and cell structures were formed in the matrix, and the former acted as preferable nucleation sites for crystallization. Improved deformation helped to produce strain-induced precipitation. The plate with 83% reduction had the most homogeneous and finest precipitation particles. Identification results by TEM indicated that the Laves precipitation was of the Fe<sub>2</sub>Nb-type crystal structure type, with impurities including Mo, Cr, and Si. The plate with uniform Laves particles displayed favorable heat stability after a long period of aging at 800 °C. The microstructure evolution of the aged sample was also observed. The deformation microstructure and the strain-induced precipitation mechanism of FeCrAl alloys are discussed. |
topic |
FeCrAl alloy Laves phase precipitation particle strain-induced precipitation |
url |
https://www.mdpi.com/1996-1944/12/18/2939 |
work_keys_str_mv |
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1724947092167720960 |