检索结果-南通市图书馆

in situ neutron diffraction revealing the achievement of excellent combination of strength and ductility in metastable austenitic steel by grain refinement

引用

Journal of Materials Science & Technology 2024年第9期176卷 69-82页

作者： Wenqi Mao Wu Gong Stefanus Harjo Satoshi Morooka Si Gao Takuro Kawasaki Nobuhiro Tsuji J-PARC Center Japan Atomic Energy AgencyIbarakiJapan Department of Materials Science and Engineering Kyoto UniversitySakyo-kuKyotoJapan

The yield stress of Fe-24Ni-0.3C(wt%)metastable austenitic steel increased 3.5 times(158→551 MPa)when the average grain size decreased from 35μm(coarse-grained[CG])to 0.5μm(ultrafine-grained[UFG]),whereas the tensile elongation was kept large(0.87→0.82).in situ neutron diffraction measurements of the CG and UFG Fe-24Ni-0.3C steels were performed during tensile deformation at room temperature to quantitatively elucidate the influence of grain size on the mechanical properties and deformation *** initial stages of plastic deformation in the CG and UFG specimens were dominated by dislocation slip,with deformation-induced martensitic transformation(DIMT)also occurring in the later stage of *** show that grain refinement increases the initiation stress of DIMT largely and suppresses the rate of DIMT concerning the strain,which is attributed to the following effects.(i)Grain refinement increased the stabilization of austenite and considerably delayed the initiation of DIMT in the//LD(LD:loading direction)austenite grains,which were the most stable grains for *** a result,most of the//LD austenite grains in the UFG specimen failed to transform into martensite.(ii)Grain refinement also suppressed the autocatalytic effect of the martensitic ***,the DIMT with the low transformation rate in the UFG specimen was more efficient in increasing the flow stress and more appropriate to maintain uniform deformation than that in the CG specimen during *** above phenomena mutually contributed to the excellent combination of strength and ductility of the UFG metastable austenitic steel.

关键词： Ultrafine grain Deformation-induced martensitic transformation Metastable austenitic steel in situ neutron diffraction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Static Tensile Deformation Behaviors of an Fe-30Mn-3Al-3Si TWIP Steel Studied by In-situ neutron diffraction

引用

Journal of Iron and Steel Research International 2011年第S1期18卷 178-182页

作者： Tsuchida N Ueji R Tomota Y Graduate School of Engineering University of Hyogo2167 ShoshaHimejiHyogoJapan Faculty of Engineering Kagawa University2217-20Hayashi-choTakamatsuKagawaJapan Graduate School of Science and Engineering Ibaraki University4-12-1NakanarusawaHitachiIbarakiJapan

TWIP (TWinning Induced Plasticity) steel is one of the advanced steels with attractive mechanical *** typical composition of TWIP steel includes a large amount of manganese with some aluminum and *** study has shown that TWIP steel exhibits high strength with adequate elongation at high strain rates,so that TWIP steel is desired to be applied for automotive ***,there are few studies concerning the deformation behaviors aimed to make clear the TWIP effect in TWIP *** this study,static tensile deformation behaviors of an Fe-30Mn-3Al-3Si TWIP steel and a SUS310S one were studied by in situ neutron diffraction during tensile *** terms of mechanical properties obtained by the static tensile tests,the TWIP steel showed better balance of tensile strength and uniform elongation than the 310S *** angular dispersion neutron diffraction with a wavelength of 0.16 nm was performed during stepwise tensile testing by using a neutron diffractometer for residual stress analysis (RESA) at the Japan Atomic Energy Agency.A specimen was extended in a step by step manner and neutron diffraction profiles of (111),(200) and (311) for austenite were obtained at each *** diffraction peak,lattice plane spacing,lattice plane strain and so on were determined by the profile analysis as a function of applied *** changes of lattice plane strain for austenite in the TWIP and 310S steels indicated several deformation stages in the tensile deformation and can be discussed the difference of intergranular stress between the two samples.

关键词： deformation twinnning tensile deformation in situ neutron diffraction lattice plane strain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Unraveling transition-metal-mediated stability of spinel oxide via in situ neutron scattering

引用

Journal of Energy Chemistry 2022年第5期31卷 60-70页

作者： Yan Chen Ke An neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTN 37831USA

The energy materials performance is intrinsically determined by structures from the average lattice structure to the atom arrangement, valence, and distribution of the containing transition metal(TM) elements. Understanding the mechanism of the structure transition and atom rearrangement via synthesis or processing is key to expediting the exploration of excellent energy materials. In this work, in situ neutron scattering is employed to reveal the real-time structure evolution, including the TM-O bonds, lattice,TM valence and the migration of the high-voltage spinel cathode LiNi_(0.5)Mn_(1.5)O_(4). The transition-metalmediated spinel destabilization under the annealing at the oxygen-deficient atmosphere is *** formation of Mn^(3+) is correlated to the TM migration activation, TM disordered rearrangement in the spinel, and the transition to a layered-rocksalt phase. The further TM interdiffusion and Mn^(3+) reduction are also revealed with multi-stage thermodynamics and kinetics. The mechanisms of phase transition and atom migrations as functions of temperature, time and atmosphere present important guidance on the synthesis in various-valence element containing oxides.

关键词： in situ neutron diffraction Pair distribution function Energy storage material Material synthesis High-temperature phase transition Disordering Atomic interdiffusion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：