Microstructure modification and mechanical property improvement of reduced activation ferritic/martensitic steel by severe plastic deformation

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	Microstructure modification and mechanical property improvement of reduced activation ferritic/martensitic steel by severe plastic deformation
	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.
	2018-01-18
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	712 页码:97-107
摘要	9Cr2WVTa ferritic/martensitic steel was processed by cold-swaging and post-annealing in order to investigate the microstructure evolution and its effect on the mechanical properties. Optical microscopy, scanning electron microscopy with electron backscatter diffraction, and transmission electron microscopy were utilized for the microstructural characterization during the cold-swaging and post-annealing process, and the mechanical properties were determined by microhardness, tensile and creep tests. The results revealed that, nearly equiaxed ultrafine grains with the average size of similar to 330 nm and fine dispersed carbides with the average length of similar to 50 nm, were obtained after cold-swaging and post-annealing. In comparison with the initial normalized-tempered sample, effective grain boundary strengthening and dispersion strengthening in the post-annealed sample enhanced the strength at room and elevated temperature. The presence of fine dispersed carbides could retard the initiation and propagation of the cracks, leading to a better ductility in the post-annealed sample. During creep test, fine dispersed carbides in the post-annealed sample effectively slowed down grain boundary migration. The pinned grain boundaries and fine dispersed carbides in the post-annealed sample acted as obstacles to the motion of mobile dislocations, which resulted in the enhanced creep properties.; 9Cr2WVTa ferritic/martensitic steel was processed by cold-swaging and post-annealing in order to investigate the microstructure evolution and its effect on the mechanical properties. Optical microscopy, scanning electron microscopy with electron backscatter diffraction, and transmission electron microscopy were utilized for the microstructural characterization during the cold-swaging and post-annealing process, and the mechanical properties were determined by microhardness, tensile and creep tests. The results revealed that, nearly equiaxed ultrafine grains with the average size of similar to 330 nm and fine dispersed carbides with the average length of similar to 50 nm, were obtained after cold-swaging and post-annealing. In comparison with the initial normalized-tempered sample, effective grain boundary strengthening and dispersion strengthening in the post-annealed sample enhanced the strength at room and elevated temperature. The presence of fine dispersed carbides could retard the initiation and propagation of the cracks, leading to a better ductility in the post-annealed sample. During creep test, fine dispersed carbides in the post-annealed sample effectively slowed down grain boundary migration. The pinned grain boundaries and fine dispersed carbides in the post-annealed sample acted as obstacles to the motion of mobile dislocations, which resulted in the enhanced creep properties.
部门归属	[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
关键词	High-temperature Oxidation Martensitic Steel Attrition Treatment Fusion Application 9cr2wvta Steel Ferritic Steel Creep Behavior Alloys Irradiation
学科领域	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	Major Research Plan of the National Natural Science Foundation of China [91226204]; National Natural Science Foundation of China [51401215]; Innovation Foundation of IMR [2015-PY10]
收录类别	SCI
语种	英语
WOS记录号	WOS:000423892500011
引用统计	被引频次：31[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79576
专题	中国科学院金属研究所
通讯作者	Chen, 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.
推荐引用方式 GB/T 7714	Jin, XJ,Chen, SH,Rong, LJ,et al. Microstructure modification and mechanical property improvement of reduced activation ferritic/martensitic steel by severe plastic deformation[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,712:97-107.
APA	Jin, XJ,Chen, SH,Rong, LJ,&Rong, LJ .(2018).Microstructure modification and mechanical property improvement of reduced activation ferritic/martensitic steel by severe plastic deformation.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,712,97-107.
MLA	Jin, XJ,et al."Microstructure modification and mechanical property improvement of reduced activation ferritic/martensitic steel by severe plastic deformation".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 712(2018):97-107.