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Effect of Cerium on High-Temperature Oxidation Resistance of 00Cr17NbTi Ferritic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 501-507页

作者： Xin Li Jun Shu Liqing Chen hongyun bi State Key Laboratory of Rolling and Automation Northeastern University Research Institute of Baosteel State Key Laboratory of Development and Application Technology of Automobile SteelsBaosteel Group Technical Center Faurecia Exhaust Control Technology Development (Shanghai) Co. Ltd

The influence of cerium addition on the isothermal oxidation behavior of 00Cr17NbTi ferritic stainless steel was studied at temperature up to 1,000 ℃ for 100 h in air. The results show that cerium additions can reduce the grain size of this ferritic stainless steel, improve the diffusion of chromium and decrease the critical concentration of chromium to form protective Cr2O3 layer. With the increasing of cerium addition, the oxide particles become smaller and this can increase the rupture strength and spalling resistance of oxide layers. The transport mechanism through the oxide layer is varied from metal transport outward from steel to principally oxygen transport inward with the increase of cerium content, which leads to the lower oxidation rate and the better scale adherence of 00Cr17NbTi ferritic stainless steel.

关键词： Ferritic stainless steel Oxidation Cerium oxides Cavity

Effect of Mo on High-Temperature Fatigue Behavior of 15CrNbTi Ferritic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 452-456页

作者： Tianlong Liu Lijia Chen hongyun bi Xin Che School of Materials Science & Engineering Shenyang University of Technology State Key Laboratory of Development and Application Technology of Automobile Steels Baosteel Group

In order to understand the effect of Mo element on the high-temperature fatigue behavior of 15CrNbTi ferritic stainless steel, the stress-controlled fatigue tests have been performed for both 15CrNbTi and 15Cr0.5MoNbTi ferritic stainless steels at 800 ℃ in laboratory air. The fatigue test results indicate that the fatigue resistance of 15Cr0.5MoNbTi steel is manifestly higher than that of 15CrNbTi steel at the maximum stress below 57 MPa; the 15Cr0.5MoNbTi steel possesses a fatigue limit of 35 MPa, which is higher than that of 15CrNbTi steel. The TEM observations reveal that the Mo element can suppress the formation of coarsened Fe3Nb3C precipitates and result in the fatigue resistance enhancement. The dislocation networks formed during the cyclic load favor to improve the fatigue resistance of 15Cr0.5MoNbTi steel at 800 ℃.

关键词： Ferritic stainless steel High-temperature fatigue Mo Microstructure

The rise of supercapacitor diodes:Current progresses and future challenges

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Chinese Physics B 2024年第2期33卷 10-20页

作者：马鸿云马凌霄毕华盛兰伟 School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China School of Materials and Energy Lanzhou UniversityLanzhou 730000China

Supercapacitor has been widely known as a representative electrochemical energy storage device with high power density and long ***,with the deeper understanding of its charge storage mechanism,unidirectional-charging supercapacitor,also called supercapacitor diode(CAPode),is successfully developed based on the ion-sieving effect of its working electrode towards electrolyte *** CAPode integrates mobile ion and mobile electron in one hybrid circuit,it has a great potential in the emerging fields of ion/electron coupling logic operations,human–machine interface,neural network interaction,and in vivo diagnosis and ***,we herein elucidate the working mechanism and design philosophy of CAPode,and summarize the electrode materials that are suitable for constructing ***,some other supercapacitor-based devices beyond CAPode are also introduced,and their potential applications are instructively ***,we outline the challenges and chances of CAPode-related techniques.

关键词： supercapacitor diode ion-sieving effect ion/electron coupling circuit logic operation

X-ray-activated bi^(3+)/Pr^(3+)co-doped LiYGeO_4 phosphor with UV and NIR dual-emissive persistent luminescence

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Journal of Rare Earths 2024年第5期42卷 955-961,I0005页

作者： Xianggui Yin hongyun Zhong Lin Liu Junpeng Shi Xia Sun Yun Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen361021China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou350108China

X-ray-activated luminescence materials have broad application prospects in photodynamic therapy of deep *** them,X-ray-activated persistent luminescence materials(PLMs)exhibiting multiple emission peaks have drawn extensive attention for the ir capacity to achieve a combination of bioimaging and therapeutic ***,we developed a novel PLM,LiYGeO_4:bi^(3+),Pr^(3+),that simultaneously exhibits UV and NIR dual persistent luminescence(PersL)emissions after irradiation by *** material can be re peatedly excited by X-ray and emits similar lumine scence intensity every time,which shows good PersL *** addition,LiYGeO_4:bi^(3+),Pr^(3+)exhibits photostimulated PersL properties by stimulation with a red light-emitting diode(LED)or NIR laser after long-term *** work provides a new choice of X-ray-excited PLMs with UV and NIR dual emission and the novel phosphor shows promise as a potential candidate for the integration of treatment and diagnosis of deep tumors.

关键词： Co-doping X-ray-activated Dual emissions Persistent luminescence Rare earths

Precipitation of carbide and its effects on the properties of nickel-saving austenitic stainless steel

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Baosteel Technical Research 2021年第1期15卷 24-28页

作者： CHANG E bi hongyun Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

In this work,the effects of temperature and cooling rate on the precipitation of carbides in nickel-saving metastable austenitic stainless steel were *** test results show that the temperature range of carbide precipitation in the test steel was 500-950℃,and 750℃was the most sensitive ***,when completely solution treated samples were cooled from high to room temperature at a cooling rate of more than 50 K/s,no carbides *** carbide precipitates increased the yield strength but decreased the corrosion resistance of the steel,with little impact on toughness.

关键词： carbide precipitates nickel-saving austenitic stainless steel solution

Inclusion and its deformation behavior in 304 stainless steel

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Baosteel Technical Research 2015年第3期9卷 61-64页

作者： JI Dengping bi hongyun Baosteel Stainless Steel Co. Ltd. Research Institute Baoshan Iron & Steel Co.Ltd.

Non-metallic inclusion is the main reason for the presence of surface defects in cold-rolled steel strip. In this study, the composition, morphology, and size of the non-metallic inclusion in hot-rolled 304 stainless steel strips are analyzed. Cold-rolled 304 stainless steel strips with different cold-rolling reduction have been prepared, and the morphology and size of inclusion in these cold-rolled strips are also analyzed. Furthermore, the deformation behavior of a non-metallic inclusion during the cold-rolling process is studied. The results show that CaO-SiO2- MgO-Al2 O3, a kind of brittle compound oxide,is the main type of inclusion in hot-rolled 304 stainless steel strips. During the cold-rolling process, ductile deformation of this type of inclusion is not obvious, where large inclusions are crushed, and the average size of inclusions in cold-rolled strips decreased while the cold-rolling reduction increased.

关键词： stainless steel cold-rolled steel strip inclusion deformation behavior

In-situ three-dimensional visualization of dynamic tension deformation in ferrite stainless steels

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Baosteel Technical Research 2013年第4期7卷 56-61页

作者： ZHANG Zhixia bi hongyun LI Xin Stainless Steel Technical Centre Research InstituteBaoshan Iron & Steel Co.Ltd.

An improved three-dimensional （3-D） experimental visualization methodology is presented tor evaluating the fracture mechanisms of ferritic stainless steels by in-situ tensile testing with an environmental scanning electron microscope （ESEM）. The samples were machined with a radial notched shape and a sloped surface. Both planar surface deformation and sloping surface deformation-induced microvoids were observed during dynamic tension experiments, where a greater amount of information could be obtained from the sloping surface. The results showed that microvoids formed at the grain boundaries of highly elongated large grains. The microvoids nucleated in the severely deformed regions grew nearly parallel to the tensile axis, predominantly along the grain boundaries. The microvoids nucleated at the interface of particles and the matrix did not propagate due to the high plasticity of the matrix. The large microvoids propagated and showed a zigzag shape along the grain boundaries,seemingly a consequence of the fracture of the slip bands caused by dislocation pile-ups. The final failure took place due to the reduction of the load-beating area.

关键词： three-dimensional (3-D) visualization microvoids in-situ dynamic tensile testing ferritic stainless steels

High-temperature oxidation behavior of austenitic stainless steel Cr20Ni12Si2RE

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Baosteel Technical Research 2019年第1期13卷 32-37页

作者： ZHANG Zhixia HONG Liu bi hongyun Research Institute Baoshan Iron & Steel Co.Ltd. State Key Laboratory of Development and Application Technology of Automotive Steels( Baosteel) Ningbo Baoxin Stainless Steel Co. Ltd.

Austenitic stainless steel Cr20 Ni12 Si2 RE was developed for use in hot-end components of automobile exhaust systems,especially in automobiles designed according to the China VI emission standard. The hightemperature oxidation kinetic curve of Cr20 Ni12 Si2 RE at 1 050 ℃ was obtained using the weighting method. The oxidation curves exhibit the parabolic law at 1 050 ℃; after 250 h of oxidation,the mass gain was 22 g/m^2. The morphology,structure,and composition of the oxide film were examined using scanning electron microscopy and Xray diffraction methods. A thin,stable,and dense spinel oxide film obtained after 250 h of oxidation at 1 050 ℃ was mainly composed of( Mn_(0.87)Fe_(0.13))( Mn_(0.13)Fe_(0.87)Cr) O_4 and Cr_2 O_3 with a silicon-containing oxide underneath. The addition of rare earth elements was found to restrict further diffusion of metallic atoms from the austenite toward the oxide film,and consequently,led to a low growth rate of the oxide film. The inner silicon-containing oxide was produced by the diffusion of oxygen atoms and enhanced the coherent strength of the oxide film.

关键词： Cr20Ni12Si2RE automobile exhaust system high-temperature oxidation oxide film

Development of low-cost high-strength stainless steel for new-energy bus frames

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Baosteel Technical Research 2017年第4期11卷 34-39页

作者： bi hongyun chang e li xin Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201900China

Along with strict environmental regulation, new-energy vehicles are becoming increasingly popular due to their low emissions, and they will inevitably replace existing fossil-fuel-based buses in China. To achieve a lightweight bus body ,high-strength steels are commonly used for the bus frame,but these grades are susceptible to corrosion. From the perspective of ＂lower life-cycle cost＂, high-strength stainless steel is a better bus structure choice than high-strength carbon steels, since stainless steel bus frames last 10-15 years without requiring any maintenance. The low-cost high-strength stainless steels developed by Baosteel are introduced,the yield and tensile strengths of which can be controlled to within the range of 350-700 MPa and 900-1 200 MPa,respectively, and the elongation values are above 30%. Measurements of the toughness and fatigue resistance of these high-strength stainless steels and their joints indicate that the structural integrity requirements for bus frames can be met. The results of salt spray corrosion studies indicate that stainless steels will substantially increase the service life of bus frames in wet and icy winter conditions where deicing with CaC12 is necessary for road safety. The results of our investigation clearly indicate that high-strength stainless steel is a potential bus-frame material that makes it possible to achieve substantial weight savings, excellent corrosion resistance, and prolonged operational life.

关键词： high-strength stainless steel bus flame lightweight