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Effect of Fe2Zr phase on the mechanical properties and fracture behavior of Fe-Cr-W-Zr ferritic alloy
Jin, XJ; Chen, SH; Rong, LJ; Rong, LJ (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
2018-04-11
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume722Pages:173-181
AbstractTwo Fe-9Cr-2W-Zr ferritic alloys with Zr contents of similar to 7 and similar to 10 wt% were designed to investigate the effect of Fe2Zr phase on the mechanical properties and fracture behavior. It is found that after hot deformation and annealing, the as-cast lamellar eutectic structures are destroyed, showing a microstructure consisting of dispersed micrometer-sized Fe2Zr phases and equiaxed a-Fe grains. The area fraction of Fe2Zr phase increases with the increase of Zr content, and the strengthening effect of dispersed Fe2Zr phases leads to a remarkable increase in the strength and a decrease in the ductility at room and elevated temperature. Compared with 9Cr2WVTa steel, Fe-Cr-W-Zr ferritic alloy with the Zr content of similar to 10 wt% presents a higher strength-ductility synergy at elevated temperature. Investigation on the fracture process shows that the critical event controlling fracture at room temperature is the nucleation of cracks within Fe2Zr phases due to the plastic strain incompatibility between the soft alpha-Fe and hard Fe2Zr phases, which further leads to the cleavage fracture of alpha-Fe matrix. When tensile at 973 K, ductile alpha-Fe matrix could retard the nucleation and propagation of cracks, resulting in the enhanced high-temperature ductility. Besides, the excellent thermal stability of alpha-Fe grain boundaries and Fe2Zr/matrix interfaces in the Fe-Cr-W-Zr ferritic alloy ensures better creep-rupture properties than 9Cr2WVTa steel.; Two Fe-9Cr-2W-Zr ferritic alloys with Zr contents of similar to 7 and similar to 10 wt% were designed to investigate the effect of Fe2Zr phase on the mechanical properties and fracture behavior. It is found that after hot deformation and annealing, the as-cast lamellar eutectic structures are destroyed, showing a microstructure consisting of dispersed micrometer-sized Fe2Zr phases and equiaxed a-Fe grains. The area fraction of Fe2Zr phase increases with the increase of Zr content, and the strengthening effect of dispersed Fe2Zr phases leads to a remarkable increase in the strength and a decrease in the ductility at room and elevated temperature. Compared with 9Cr2WVTa steel, Fe-Cr-W-Zr ferritic alloy with the Zr content of similar to 10 wt% presents a higher strength-ductility synergy at elevated temperature. Investigation on the fracture process shows that the critical event controlling fracture at room temperature is the nucleation of cracks within Fe2Zr phases due to the plastic strain incompatibility between the soft alpha-Fe and hard Fe2Zr phases, which further leads to the cleavage fracture of alpha-Fe matrix. When tensile at 973 K, ductile alpha-Fe matrix could retard the nucleation and propagation of cracks, resulting in the enhanced high-temperature ductility. Besides, the excellent thermal stability of alpha-Fe grain boundaries and Fe2Zr/matrix interfaces in the Fe-Cr-W-Zr ferritic alloy ensures better creep-rupture properties than 9Cr2WVTa steel.
description.department[jin, xiaojie ; chen, shenghu ; rong, lijian] chinese acad sci, inst met res, key lab nucl mat & safety assessment, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [jin, xiaojie] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china
KeywordMartensitic Steels Fusion-reactors Ods Steel Strength Deformation Microstructure Stability Zirconium System Temperatures
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationMajor Research Plan of the National Natural Science Foundation of China [91226204]; National Natural Science Foundation of China [51401215]; Innovation Foundation of IMR [2015-PY10]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79370
Collection中国科学院金属研究所
Corresponding AuthorChen, SH; Rong, LJ (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Jin, XJ,Chen, SH,Rong, LJ,et al. Effect of Fe2Zr phase on the mechanical properties and fracture behavior of Fe-Cr-W-Zr ferritic alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,722:173-181.
APA Jin, XJ,Chen, SH,Rong, LJ,&Rong, LJ .(2018).Effect of Fe2Zr phase on the mechanical properties and fracture behavior of Fe-Cr-W-Zr ferritic alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,722,173-181.
MLA Jin, XJ,et al."Effect of Fe2Zr phase on the mechanical properties and fracture behavior of Fe-Cr-W-Zr ferritic alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 722(2018):173-181.
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