A kind of micro/nanostructured 2205 duplex stainless steel(DSS)with uniform distribution of nanocrystals was prepared via aluminothermic reaction method.The analysis of stress-strain curve showed that the fracture str...A kind of micro/nanostructured 2205 duplex stainless steel(DSS)with uniform distribution of nanocrystals was prepared via aluminothermic reaction method.The analysis of stress-strain curve showed that the fracture strength and elongation of the specimen were 946 MPa and 24.7%,respectively.At present,the research on microstructure of bimodal 2205 DSS at room temperature(RT)mainly depended on scanning electron microscope(SEM)observation after loading experiments.The test result indicates that there are two different yield stages in stress-strain curve of specimen during tensile process.The microstructure of duplex bimodal structured stainless steel consists of two pairs of soft hard regions and phases.By studying deformation mechanism of bimodal structured stainless steel,the interaction between soft phase and hard phase are discussed.The principle of composition design and microstructure control of typical duplex stainless steel is obtained,which provides an important research basis for designing of advanced duplex stainless steel.展开更多
We demonstrate a 2205 duplex stainless steel(DSS)synthesized by aluminothermic reaction and followed two-step rolling which had a superior yield strength of 863 MPa,ultimate tensile strength of1103 MPa and an elongati...We demonstrate a 2205 duplex stainless steel(DSS)synthesized by aluminothermic reaction and followed two-step rolling which had a superior yield strength of 863 MPa,ultimate tensile strength of1103 MPa and an elongation of 21%at room temperature.The phase,grain size and distribution of the steel were characterized by optical microscope,X-ray diffraction,electron back-scatter diffraction and transmission electron microscope.The results show that the steel consists of lamellar ferrite and austenitic phase with multiple grain size distribution from nanoscale to microscale.The high strength is attributed to strengthening of high back stress arising from laminated dual-phase heterogeneous ultrafine grained structure and distribution.The high ductility originates from back-stress hardening and dislocation hardening.展开更多
随着人口老龄化的进展和不健康生活方式的流行,我国卒中的发病率和死亡率日益升高。在一项来自全球疾病负担研究(global burden of disease,GBD)的全球卒中终身风险报告中,我国男性以41.1%的卒中终身风险高居世界首位,并呈现巨大的性别...随着人口老龄化的进展和不健康生活方式的流行,我国卒中的发病率和死亡率日益升高。在一项来自全球疾病负担研究(global burden of disease,GBD)的全球卒中终身风险报告中,我国男性以41.1%的卒中终身风险高居世界首位,并呈现巨大的性别差异(女性为36.7%)[1]。高居不下的卒中风险给我国居民带来极大的疾病负担。我国卒中发病率持续增长,已成为成年人死亡的首位原因[2]。据GBD数据显示,2017年我国卒中发病率为301.44/10万,远高于156.16/10万的全球卒中发病率[3]。我国正面临着严峻的卒中形势。展开更多
基金Funded by the National Natural Science Foundation of China(No.51911530119)the Department of Education of Gansu Province Innovation Fund(No.2021A-023)the Open Fund Project of Key Laboratory of Solar Power System Engineering Project(No.2022SPKL01)。
文摘A kind of micro/nanostructured 2205 duplex stainless steel(DSS)with uniform distribution of nanocrystals was prepared via aluminothermic reaction method.The analysis of stress-strain curve showed that the fracture strength and elongation of the specimen were 946 MPa and 24.7%,respectively.At present,the research on microstructure of bimodal 2205 DSS at room temperature(RT)mainly depended on scanning electron microscope(SEM)observation after loading experiments.The test result indicates that there are two different yield stages in stress-strain curve of specimen during tensile process.The microstructure of duplex bimodal structured stainless steel consists of two pairs of soft hard regions and phases.By studying deformation mechanism of bimodal structured stainless steel,the interaction between soft phase and hard phase are discussed.The principle of composition design and microstructure control of typical duplex stainless steel is obtained,which provides an important research basis for designing of advanced duplex stainless steel.
基金Funded by the National Natural Science Foundation of China(No.51561020)。
文摘We demonstrate a 2205 duplex stainless steel(DSS)synthesized by aluminothermic reaction and followed two-step rolling which had a superior yield strength of 863 MPa,ultimate tensile strength of1103 MPa and an elongation of 21%at room temperature.The phase,grain size and distribution of the steel were characterized by optical microscope,X-ray diffraction,electron back-scatter diffraction and transmission electron microscope.The results show that the steel consists of lamellar ferrite and austenitic phase with multiple grain size distribution from nanoscale to microscale.The high strength is attributed to strengthening of high back stress arising from laminated dual-phase heterogeneous ultrafine grained structure and distribution.The high ductility originates from back-stress hardening and dislocation hardening.
文摘随着人口老龄化的进展和不健康生活方式的流行,我国卒中的发病率和死亡率日益升高。在一项来自全球疾病负担研究(global burden of disease,GBD)的全球卒中终身风险报告中,我国男性以41.1%的卒中终身风险高居世界首位,并呈现巨大的性别差异(女性为36.7%)[1]。高居不下的卒中风险给我国居民带来极大的疾病负担。我国卒中发病率持续增长,已成为成年人死亡的首位原因[2]。据GBD数据显示,2017年我国卒中发病率为301.44/10万,远高于156.16/10万的全球卒中发病率[3]。我国正面临着严峻的卒中形势。
