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Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing.
Materials (Basel) 2019; 12(18)M

Abstract

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 Fe2Nb-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.

Authors+Show Affiliations

Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. zhengjiyun@aliyun.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. jaja880816@aliyun.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. dupeinan@126.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. qinghe5525@163.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. panqianfu1234@163.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. ustbzhangyiyong@163.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. lch85904239@163.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. zhang_ruiqian@126.com.Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China. fmkl@npic.ac.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31514358

Citation

Zheng, Jiyun, et al. "Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing." Materials (Basel, Switzerland), vol. 12, no. 18, 2019.
Zheng J, Jia Y, Du P, et al. Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing. Materials (Basel). 2019;12(18).
Zheng, J., Jia, Y., Du, P., Wang, H., Pan, Q., Zhang, Y., ... Qiu, S. (2019). Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing. Materials (Basel, Switzerland), 12(18), doi:10.3390/ma12182939.
Zheng J, et al. Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing. Materials (Basel). 2019 Sep 11;12(18) PubMed PMID: 31514358.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing. AU - Zheng,Jiyun, AU - Jia,Yuzhen, AU - Du,Peinan, AU - Wang,Hui, AU - Pan,Qianfu, AU - Zhang,Yiyong, AU - Liu,Chaohong, AU - Zhang,Ruiqian, AU - Qiu,Shaoyu, Y1 - 2019/09/11/ PY - 2019/08/18/received PY - 2019/09/04/revised PY - 2019/09/06/accepted PY - 2019/9/14/entrez PY - 2019/9/14/pubmed PY - 2019/9/14/medline KW - FeCrAl alloy KW - Laves phase KW - precipitation particle KW - strain-induced precipitation JF - Materials (Basel, Switzerland) JO - Materials (Basel) VL - 12 IS - 18 N2 - 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 Fe2Nb-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. SN - 1996-1944 UR - https://www.unboundmedicine.com/medline/citation/31514358/Control_of_Laves_Precipitation_in_a_FeCrAl-based_Alloy_Through_Severe_Thermomechanical_Processing L2 - http://www.mdpi.com/resolver?pii=ma12182939 DB - PRIME DP - Unbound Medicine ER -