In situ SEM analysis for deformation mechanism of micro/nanostructured 304 stainless steel with high strength and good plasticity

doi:10.1142/S0217984918501828

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	In situ SEM analysis for deformation mechanism of micro/nanostructured 304 stainless steel with high strength and good plasticity
	Sheng, Jie 1,2; La, Peiqing 1,3; Su, Jiaqiang 4; Ren, Junqiang 3; Ma, Jiqiang 3; Shi, Yu 1; Li, Zhengning 1; Wang, Jiao 1
刊名	MODERN PHYSICS LETTERS B
	2018-06-20
卷号	32 期号:17
关键词	Micro/nanostructured bimodal grain size distribution high strength and good plasticity stainless steel in situ SEM tensile deformation mechanism
ISSN号	0217-9849
DOI	10.1142/S0217984918501828
英文摘要	Bulk micro/nanostructured 304 austenitic stainless-steel plates with bimodal grain size distributions were prepared by Alumina Thermite Reaction at various temperatures and extents of rolling deformation. Rolling cogging of the sheet was performed with a rolling reduction of 40% at 1000 degrees C followed by rolling reduction of 80% at 700 degrees C. The strength and plasticity of the resulting micro/nanostructured 304 stainless steels with bimodal grain size distribution achieved the best matching, with tensile strength, yield strength, and elongation of 1410 MPa, 723 MPa and 15.3%, respectively. To better understand the deformation mechanism of this micro/nanostructured stainless steel sample, an in situ scanning electron microscopy technique was adopted. The crack initiation, propagation, and fracture were dynamically observed and recorded during the tensile deformation. Our results revealed that a stress concentration near the preset notch served as the initiation source and that microcracks were formed in the grain boundaries between micro and nano-grains and then spread to the microcrystalline region until passing through the microcrystalline region or until passivation occurred in the microcrystalline region. The microcracks not only caused serious damage to the specimen but also generated back stress, which could lead to hardening of material, thereby enhancing the global ductility. Finally, the mechanism responsible for the enhanced plasticity and strength of the micro/nanostructured 304 stainless steel with a bimodal grain size distribution was analyzed and combined with the fracture morphology.
资助项目	Scientific Research Foundation of the Higher Education Institutions of Gansu Province[2018A-019] ; Innovative and Entrepreneurial Talents Program of Lanzhou City[2017-RC-20] ; National Natural Science Foundation of China[51561020]
WOS研究方向	Physics
语种	英语
出版者	WORLD SCIENTIFIC PUBL CO PTE LTD
WOS记录号	WOS:000435581300002
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32597]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院学科建设与学位办公室
通讯作者	Sheng, Jie
作者单位	1.Lanzhou Univ Technol, Sch Mat Sci & Engn, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China 2.Lanzhou Univ Technol, BaiYin Res Inst Novel Mat, Baolan Rd 333, Baiyin 730900, Peoples R China 3.Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China 4.Ind Res Inst Lanzhou, Jianlanlu St Qilihe 9, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Sheng, Jie,La, Peiqing,Su, Jiaqiang,et al. In situ SEM analysis for deformation mechanism of micro/nanostructured 304 stainless steel with high strength and good plasticity[J]. MODERN PHYSICS LETTERS B,2018,32(17).
APA	Sheng, Jie.,La, Peiqing.,Su, Jiaqiang.,Ren, Junqiang.,Ma, Jiqiang.,...&Wang, Jiao.(2018).In situ SEM analysis for deformation mechanism of micro/nanostructured 304 stainless steel with high strength and good plasticity.MODERN PHYSICS LETTERS B,32(17).
MLA	Sheng, Jie,et al."In situ SEM analysis for deformation mechanism of micro/nanostructured 304 stainless steel with high strength and good plasticity".MODERN PHYSICS LETTERS B 32.17(2018).