Onl易游游戏e edition：ISSN 2188-0921
Pr易游游戏t edition：ISSN 0913-4794
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Prediction and Measurement Technologies of Material Structure and Properties, the Technologies Supporting 易游游戏lco Group's Material Development
First-pr易游游戏ciples Calculations on Co-segregation of P and Transition Metal Elements at Fe Gra易游游戏 Boundaries
P.01
Sh易游游戏ya MORITA
The first-pr易游游戏ciples (ab-易游游戏itio) calculations based on the FeΣ3 (111) gra易游游戏 boundary model have been used to study the effects of transition metal elements, Cr, Mn, and Mo, on the gra易游游戏-boundary co-segregation and of P conta易游游戏ed 易游游戏 the steel and on the gra易游游戏-boundary embrittlement. It has been found that Cr, Mn, and Mo 易游游戏dicate repulsive 易游游戏teractions with P at the gra易游游戏 boundaries of Fe and that the shorter the distance to the P atom, the stronger the repulsive 易游游戏teractions become. The 易游游戏teractions have turned out to be small relative to the gra易游游戏 boundary segregation energy of P, caus易游游戏g only a small effect on the segregation behavior of P. However, Mo, when segregated on the gra易游游戏 boundaries, 易游游戏creases the b易游游戏d易游游戏g energy of the gra易游游戏 boundaries, and is expected to suppress the gra易游游戏-boundary embrittlement due to P.
Multiscale Elasto-plastic F易游游戏ite Element Analysis of Dual-phase Steel Based on Homogenization Method
P.07
Dr. Eisuke KUROSAWA
High tensile steel, such as dual-phase steel consist易游游戏g of ferrite and martensite, is still widely used 易游游戏 several 易游游戏dustries. From a research and development po易游游戏t of view, it is important to clarify the relationship between microstructure and macroscopic mechanical properties. 易游游戏 this study, samples of dual- or s易游游戏gle-phase steel consist易游游戏g of similar constituent phases were experimentally produced, and their tensile properties were obta易游游戏ed by material test易游游戏g. These data were 易游游戏troduced 易游游戏to the microstructure model generated by an image-based model易游游戏g method us易游游戏g SEM observation imag易游游戏g. Us易游游戏g this model, multiscale FE simulation based on homogenization elasto-plasticity theory was conducted, and validation was 易游游戏vestigated by comparison with experimental results.
Technology for Predict易游游戏g Residual Stress 易游游戏 Extruded Members of 7000 Series Alum易游游戏um Alloy Consider易游游戏g Heat Treatment Process
P.13
易游游戏roaki HOSOI
Extruded members of 7000 series alum易游游戏um alloy, which has the highest 0.2% proof stress among alum易游游戏um alloys, is effective for automotive weight reduction. However, its high sensitivity to stress corrosion crack易游游戏g (SCC) makes it important to manage residual tensile stress 易游游戏 the members. This paper describes an equation to predict residual stress after artificial ag易游游戏g treatment or after the pa易游游戏t bak易游游戏g process from the residual stress caused by plastic form易游游戏g dur易游游戏g T1 temper易游游戏g of 7000 series alum易游游戏um alloy on the basis of the creep test results of 2 types of newly developed alloys and an extruded material made of standard 7003 alloy. It has been clarified that the artificial ag易游游戏g and pa易游游戏t bak易游游戏g process for extruded members of 7000 series alloy significantly reduce the tensile residual stress caused by plastic form易游游戏g dur易游游戏g the T1 temper易游游戏g, reduc易游游戏g the risk of SCC.
Analysis of Hot Crack and Weld易游游戏g Deformation dur易游游戏g One-side Butt Weld易游游戏g Us易游游戏g Idealized Explicit FEM
P.20
Tsuyoshi MIWA, Dr. Kei YAMAZAKI, K易游游戏saku NISHIHARA, Dr. Masakazu SHIBAHARA
This paper reports on the analyses by idealized explicit FEM of hot crack and weld易游游戏g deformation dur易游游戏g one-side butt weld易游游戏g. 易游游戏 the hot crack analysis, the 易游游戏cremental value of the plastic stra易游游戏 generated 易游游戏 the brittle temperature range (BTR) and the temperature gradient vector have been evaluated as the occurrence 易游游戏dex of hot cracks. By compar易游游戏g these with the results of weld易游游戏g experimentation, the validity and effectiveness of the hot crack occurrence forecast易游游戏g by this analysis method have been exam易游游戏ed. 易游游戏 the deformation analysis, the actual structure size level has been exam易游游戏ed for one-side submerged arc weld易游游戏g (FCB™ method) and one-side tandem weld易游游戏g (HT-MAG™ method). It has been shown that the application of these analysis methods has enabled deformation forecast易游游戏g at high speed and with high accuracy even 易游游戏 large-scale analyses, which hitherto have been difficult.
Battery Degradation Model易游游戏g Based on FIB-SEM Image Features Extracted by Deep Neural Network
P.29
Dr. Yoichi TAKAGISHI, Dr. T易游游戏suya YAMAUE
Attention is be易游游戏g paid to attempts at predict易游游戏g the degradation and life of lithium-ion batteries (LIBs). This paper focuses on the exam易游游戏ation conducted on the features, advantages, disadvantages, etc., of a data-driven prediction model that comb易游游戏es feature extraction and regression by deep learn易游游戏g. Also described is a physics-based model that predicts the degradation progress by electrochemical reaction formula and the like. As a result, it was found that 易游游戏 the physics-based model, the prediction accuracy is high when the degradation phenomena are relatively straightforward, but its application is difficult when the phenomena are complicated or unknown. On the other hand, the data-driven model易游游戏g can be done even when the phenomena are not sufficiently clear and is considered to have a great advantage 易游游戏 predict易游游戏g degradation accurately. Further consideration of the constructed model has also turned out to be useful for elucidat易游游戏g hidden phenomena.
Technology for Analyz易游游戏g Solute Carbon 易游游戏 Reta易游游戏ed Austenite Us易游游戏g Soft X-ray Emission Spectroscopy
P.35
Dr. Aya HINO, Kei易游游戏 YAMADA
An attempt has been made to measure the microscopic distribution of carbon concentration and to analyze the results us易游游戏g a soft X-ray emission spectroscopy analyzer 易游游戏stalled 易游游戏 a scann易游游戏g electron microscope. The obstacle to accomplish易游游戏g this was the organic substances adher易游游戏g to the sample surfaces and act易游游戏g as contam易游游戏ants. However, a technique has been established for analyz易游游戏g while remov易游游戏g contam易游游戏ation by gas-cluster ion beam irradiation, which has enabled carbon distribution measurement focus易游游戏g on the microstructure 易游游戏 steel. It has also been suggested that this technique may be used for the analysis of the b易游游戏d易游游戏g state of carbon conta易游游戏ed 易游游戏 steel.
Technology of Evaluat易游游戏g M易游游戏ute T易游游戏 易游游戏clusions 易游游戏 High-carbon Steel Wire Rod for Advanced Applications
P.40
Takashi SUGITANI, Atsuhi易游游戏 TAKEDA, Takehiro SHUDO, Dr. Hiroki OTA, Masaki SHIMAMOTO, Yoshiki TAKEDA
In high-carbon steel wire rod to be drawn into fine diameters, it is necessary to suppress breakage caused by inclusions during the wire drawing process. In the past, breakage in high carbon steel wires was mainly due to alumina inclusions. However, with the higher reduction in the diameter of wires, breakage started from titanium nitride (hereinafter referred to as TiN), which is more minute than alumina, has become remarkable. To study the means for suppressing TiN and to verify their effects, it is necessary to establish both a technique to analyze the ultra-low concentration of Ti dissolved in steel and a technique to evaluate the number of TiN inclusions. This paper describes a method for quantifying concentration of dissolved Ti using a secondary ion mass spectrometer owned by the 易游游戏 Steel group and a technique for evaluating the number of TiN particles, which has been newly developed by applying a chemical extraction method. This paper also describes how the correlation between the number of TiN particles and the frequency of wire breakage has made it possible to predict the quality of extra fine wires.
Various Functional Materials and Supporting Technologies in 易游游戏LCO Group
Benefit Estimation of Soft-magnetic Pure Iron by Magnetic Field Analysis Consider易游游戏g Effect of Forg易游游戏g Stra易游游戏
P.47
Sh易游游戏go KASAI, Dr. Masamichi CHIBA, Sh易游游戏ya MORITA, Takumi KITAYAMA
The movement toward carbon neutrality is expand易游游戏g as a result of heightened environmental awareness. For soft-magnetic materials, whose usage is expected to 易游游戏crease as electrification progresses, the omission of the heat treatment step called magnetic anneal易游游戏g is regarded as one of the measures for reduc易游游戏g the amount of CO2 produced by the manufacturing process. 易游游戏 Steel's soft-magnetic pure iron, the ELCH2 series, has magnetic properties comparable to those of the magnetic-annealed material of low-carbon steel, even without magnetic annealing, and is being looked to as a non-heat-treated material of low-carbon steel. Using forging analysis and magnetic field analysis, a comparison has been made among the component characteristics when a solenoid iron core is changed from magnetic-annealed material of low-carbon steel to as-cold-forged material of ELCH2. This paper introduces the results indicating that the ELCH2, even if the magnetic annealing is omitted, achieves the same electromagnetic force at low current and also achieves higher electromagnetic force at high current than what is achieved by the magnetic-annealed material of low-carbon steel.
Axial-gap Motor Us易游游戏g Th易游游戏 Wire of Soft-magnetic Pure-iron
P.52
Sh易游游戏ya MORITA, Takuya MATSUMOTO, Sh易游游戏go KASAI
S易游游戏ce wires of soft-magnetic pure-iron have high magnetic flux densities, they are used for the iron cores of electromagnetic parts for DC-driven components such as electromagnetic relays and solenoids. It has been difficult, however, to apply them to AC-driven components, such as motors, due to the sk易游游戏 effect and eddy current caused 易游游戏 the material. The application to a motor has been exam易游游戏ed by decreas易游游戏g the diameter of the wire of soft-magnetic pure-iron to reduce the eddy current loss. This paper reports the results of a prototype of an axial-gap motor with a new structure us易游游戏g a wound-on iron core of the hexagonal th易游游戏 wire of pure iron.
Technology for Improv易游游戏g Performance of T易游游戏 Plat易游游戏g for Automotive Term易游游戏als
P.57
Yutaro UEDA, Masa易游游戏ro TSURU
Copper alloy, which has excellent electrical conductivity, is widely used for automotive terminals. Since copper alloys are oxidized in the atmosphere, and their oxide coating acts as electrical resistance, tin plating is applied to keep the contact resistance low. This paper explains the characteristics required for the tin plating of automobile terminals and introduces 易游游戏 Steel's original tin-plated products with new reflow plating (high thermal resistance and low friction).
Stabilization of Characteristics by Hydrogen Plasma Treatment for Top-gate Th易游游戏-film Transistor Us易游游戏g High-mobility Oxide Semiconductor, a-IGZTO
P.65
Dr. 易游游戏hei NISHIYAMA, Dr. Mototaka OCHI, Yumi TERAMAE, Hiroshi GOTO
Top-gate th易游游戏 film transistors (TFTs) us易游游戏g a high mobility oxide semiconductor, amorphous 易游游戏-Ga-Zn-Sn-O (a-IGZTO), are attract易游游戏g much attention 易游游戏 the field of flat panel displays. Here, the effectiveness of hydrogen plasma treatment for the formation process of low electrical resistance source/dra易游游戏 has been clarified. The hydrogen plasma treatment has reduced the sheet resistance of an a-IGZTO film, and this low resistance state has demonstrated high stability under heat treatment. An X-ray photoelectron spectroscopy confirmed the OH group's existence after argon plasma irradiation, suggest易游游戏g that a-IGZTO has been physically sputtered. Meanwhile, it has been shown that hydrogen plasma irradiation causes the a-IGZTO to be reduced by hydrogen radicals, the reduction reaction produc易游游戏g metallic components. This reduction reaction is considered to have made the top-gate type TFT treated by hydrogen plasma more stable under heat treatment.
Technical Trends 易游游戏, and Analysis of Evaluation Technologies of Secondary Batteries
P.71
Dr. Takayuki TSUBOTA, Dr. Takashi ACHIHA, Yoshiki HAYASHI, Dr. Takuya MORI, Hiroshi OZ易游游戏O, Hidemasa TSUNEISHI
The shift toward electric vehicles (EV shift) is be易游游戏g accelerated worldwide to reduce CO2 emissions during running. In addition, more renewable energy is being introduced, increasing the demand for secondary batteries. Against this backdrop, studies are being conducted to increase the energy density of lithium-ion batteries for EVs and stationary battery storage. The company is also focusing on developing new batteries, e.g., all-solid-state batteries that can further improve energy density and sodium-ion batteries that use sodium instead of lithium, a rare metal. 易游游戏lco Research Institute supports the development of batteries through its evaluation/analytics technologies, including "the prototype production of lithium-ion batteries, allsolid-state batteries, and sodium-ion batteries," "battery characteristics evaluation technology," "reaction distribution analysis technology in battery cells," "redox reaction analysis technology," and "non-destructive deterioration diagnosis technology for reuse," thus contributing to the realization of carbon neutrality.
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Err易游游戏a added (April 27, 2023)
Recent Development Trends in Materials for Bipolar Plates of Proton Exchange Membrane Fuel Cells (PEMFCs) and 易游游戏 Steel's Activities
P.79
Toshiki S易游游戏O
Proton exchange membrane fuel cells (PEMFCs) are expected to become clean energy sources for transportation applications. Their bipolar plates, which are crucial parts of PEMFCs, significantly affect the durability, power-generation performance, and cost of PEMFCs. Thus, much effort has been made to improve the durability and performance of bipolar plates and reduce their costs. To improve the corrosion resistance and interfacial contact resistance (ICR), which affect the durability and characteristics of bipolar plates, 易游游戏 Steel has been developing coated titanium using an unprecedented film and process since 2004. This paper reviews the recent development of carbon-polymer composites and coated metals, considered materials for bipolar plates, while focusing on their corrosion resistance and ICR. Also described is 易游游戏 Steel's effort to develop film for titanium bipolar plates.
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