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Effect of vanadium and chromium on the microstructural features of V–Cr–Mn–Ni spheroidal carbide cast irons

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1096-1108页

作者： V.G.Efremenko k.shimizu A.P.Cheiliakh T.V.kozarevskaya k.kusumoto k.Yamamoto Department of Metal Science and Heat Treatment of Metals Pryazovskyi State Technical UniversityMariupol 87500 Ukraine Manufacturing and Engineering Design Center Muroran Institute of TechnologyMuroran 050-8585 Japan

The objective of this investigation is to study the influence of vanadium（5.0wt%–10.0wt%） and chromium（0–9.0wt%） on the microstructure and hardness of Cr-V-Mn-Ni white cast irons with spheroidal vanadium carbides. The alloys＇ microstructural features are presented and discussed with regard to the distribution of phase elements. The structural constituents of the alloys are spheroidal VC, proeutectoid cementite, ledeburite eutectic, rosette-shaped carbide eutectic（based on M7C3）, pearlite, martensite, and austenite. Their combinations and area fraction（AF） ratios are reported to be influenced by the alloys＇ chemical composition. Spheroidized VC particles are found to be sites for the nucleation of carbide eutectics. Cr and V are shown to substitute each other in the VC and M7C3 carbides, respectively. Chromium alloying leads to the formation of a eutectic（γ-Fe ＋ М7С3）, preventing the appearance of proeutectoid cementite in the structure. Vanadium and chromium are revealed to increase the total carbide fraction and the amount of austenite in the matrix. Cr is observed to play a key role in controlling the metallic matrix microstructure.

关键词： cast irons carbides microstructure vanadium chromium austenite pearlite

Abrasive resistance of metastable V–Cr–Mn–Ni spheroidal carbide cast irons using the factorial design method

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International Journal of Minerals,Metallurgy and Materials 2016年第6期23卷 645-657页

作者： V.G.Efremenko k.shimizu A.P.Cheiliakh T.V.Pastukhova Yu.G.Chabak k.kusumoto Department of Metal Science and Heat Treatments of Metals Pryazovskyi State Technical University Department of Mechanical Aerospace and Materials Engineering Muroran Institute of Technology

Full factorial design was used to evaluate the two-body abrasive resistance of 3wt%C–4wt%Mn–1.5wt%Ni spheroidal carbide cast irons with varying vanadium（5.0wt%–10.0wt%） and chromium（up to 9.0wt%） contents. The alloys were quenched at 920℃. The regression equation of wear rate as a function of V and Cr contents was proposed. This regression equation shows that the wear rate decreases with increasing V content because of the growth of spheroidal VC carbide amount. Cr influences the overall response in a complex manner both by reducing the wear rate owing to eutectic carbides（M7C3） and by increasing the wear rate though stabilizing austenite to deformation-induced martensite transformation. This transformation is recognized as an important factor in increasing the abrasive response of the alloys. By analyzing the regression equation, the optimal content ranges are found to be 7.5wt%–10.0wt% for V and 2.5wt%–4.5wt% for Cr, which corresponds to the alloys containing 9vol%–15vol% spheroidal VC carbides, 8vol%–16vol% M7C3, and a metastable austenite/martensite matrix. The wear resistance is 1.9–2.3 times that of the traditional 12wt% V–13wt% Mn spheroidal carbide cast iron.

关键词： cast irons carbides abrasive resistance factorial design

Microstructure and phase elemental distribution in high-boron multicomponent cast irons

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 78-87页

作者： Yu.G.Chabak k.shimizu V.G.Efremenko M.A.Golinskyi k.kusumoto V.I.Zurnadzhy A.V.Efremenko Physics Department Pryazovskyi State Technical UniversityMariupol87555Ukraine Mechanical Engineering Research Unit College of Design and Manufacturing TechnologyMuroran Institute of TechnologyMuroran-city050-8585Japan

The novel cast irons of chemical composition(wt%)0.7C-5W-5Mo-5V-10Cr-2.5Ti were invented with the additions of 1.6wt%B and 2.7wt%*** aim of this work was to study the effect of boron on the structural state of the alloys and phase elemental distribution with respect to the formation of wear-resistant structural *** was found that the alloy containing 1.6wt%B was composed of three eutectics:(a)“M_(2)(C,B)_(5)+ferrite”having a“Chinese Script”morphology(89.8vol%),(b)“M_(7)(C,B)_(3)+Austenite”having a“Rosette”morphology,and(c)“M_(3)C+Austenite”having a“Ledeburite”-shaped morphology(2.7vol%).With 2.7wt%of boron content,the bulk hardness increased from HRC 31 to HRC *** primary carboborides M_(2)(C,B)_(5) with average microhardness of HV 2797 appeared in the structure with a volume fraction of 17.6vol%.The volume fraction of eutectics(a)and(b,c)decreased to 71.2vol%and 3.9vol%,*** matrix was“ferrite/austenite”for 1.6wt%B and“ferrite/pearlite”for 2.7wt%*** cast irons contained compact precipitates of carbide(Ti,M)C and carboboride(Ti,M)(C,В)with a volume fraction of 7.3%-7.5%.Based on the energy-dispersive X-ray spectroscopy,the elemental phase distributions and the appropriate phase formulas are presented in this work.

关键词： multi-component cast iron boron eutectic carbide carboboride

CRYSTAL　STRUCTURE　OF　A　LONG－PERIOD　ORDERED　PHASE　IN　Fe－C　MARTENSITE　AND　COMPUTER　SIMULATION　OF　ITS　ELECTRON　DIFFRACTION　PATTERNS

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Acta Metallurgica Sinica(English Letters) 1996年第1期9卷 23-26页

作者： REN Xiaobing WANG Xiaotian k.shimizu T.TADAkI(National Laboratory of Solid State Microstructures,Nanjing University Nanjing 210093,China)(School of Materials Science and Engineering,Xi’an Jiaotong University Xi’an 710049,China)(kanazawa Institute of Techn Nanjing Univ Nanjing China

Different structure models of a long-period ordered phase in Fe-C martenstie formed during aging have been checked by computer simulation of electron diffraction(ED) patterns based on these *** results showed that the simulated ED pattern of γ'-FexC(Ⅱ) model proposed by the present authors is in good agreement with experimentally observed ED *** was also confirmed that the incommensurate superperiod stems from the coexistence of several γ'-Fe_xC(H) phases with different *** Fe(144)C(24)(Fe6C) model proposed by Uwakweh et *** ED patterns remarkably different from the experimental ones.

关键词： Fe-C martensite long-period ordered phase crystal structure computer simulation electron diffraction pattern

New developments in high-pressure X-ray diffraction beamline for diamond anvil cell at SPring-8

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Matter and Radiation at Extremes 2020年第1期5卷 49-58页

作者： N.Hirao S.I.kawaguchi k.Hirose k.shimizu E.Ohtani Y.Ohishi Japan Synchrotron Radiation Research Institute SayoHyogo 679-5198Japan Department of Earth and Planetary Science The University of TokyoTokyo 113-0033Japan Earth-Life Science Institute Tokyo Institute of TechnologyTokyo 152-8550Japan Center of Science and Technology Under Extremes Conditions Graduate School of Engineering ScienceOsaka UniversityOsaka 560-8531Japan Department of Earth Science Graduate School of ScienceTohoku UniversitySendai 980-8578Japan

An overview of the recently renovated high-pressure X-ray diffraction(XRD)BL10XU beamline for the diamond anvil cell at SPring-8 is *** renovation includes the replacement of the X-ray source and monochromator,enhanced focusing systems for high-energy XRD,and recent progress in the sample environment control techniques that are available for high-pressure *** simultaneous measurement techniques for combination with XRD,such as Raman scattering spectroscopy and Mossbauer spectroscopy,have been developed to obtain complementary information under extreme *** advanced techniques are expected to make significant contributions to in-depth understanding of various and complicated high-pressure *** experience gained with the BL10XU beamline could help promote high-pressure research in future synchrotron radiation facilities.

关键词： beam gained extreme

Effects of cultivation of Puccinellia tenuiflora on the chemical and physical characteristics of alkalinized soil in western areas of Jilin

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Effects of cultivation of Puccinellia tenuiflora on the chem...

ⅩⅪ International Grassland Congress and the Ⅷ International Rangeland Congress

作者： N.Ishikawa M.kato k.shimizu M.Amari Graduate School of Life and Environment Science University of Tsukuba TsukubaIbaraki305-8572Japan National Institute of Livestock and Grassland Science Tsukuba Ibaraki305-0901 Japan

＜正＞Introduction Alkalinized soils are expanding over the western area in Jilin province of China and have been partially used as ***-grass（Puccinellia tenui flora）,a perennial plant in the Poaceae family,grows well in those areas,unlike most grasses which do not grow in soils with very high levels of *** has been observed that some grasses become established after several years of cultivation of the alkali grass in these ***,it is expected that the grass could be used to improve alkalinized *** in soil characteristics from alkali-grass cultivation,however,were not determined in detail in previous *** present study,therefore,was conducted to clarify the effects of alkali-grass cultivation on the chemical components and physical characteristics of alkali soil in Jilin.

关键词： alkalinized soil alkali-grass Puccinellia tenui flora chemical and physical characteristics of soil

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双体船的设计

武汉造船 1982年第3期 70-77页

作者： M·UNOZAWA k.shimizu 王彩当

本文介绍了自1961年以来在日本钢管公司下属船厂建造的41艘排水量型双体船的资料和试验结果。以初步设计的观点略述了双体船的要素特征和各种问题。

关键词：双体船甲板稳性波浪船型船舶船舶结构单体船片体间距

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一个可靠的语言基音提取新系统

通信技术 1989年第4期22卷 72-77页

作者： H.Fujisaki k.Hirose k.shimizu 郭静宜

在传统的基音提取方法中,错误的产生可以分为两类:1)来自分析方法的外在因素,例如由于分析窗的形状、宽度和位置的不适当而产生的不理想的信号表示等等;2)语言信号本身存在的内在因素,例如存在强的谐波分量或次谐波分量等等。实际上,在... 详细信息

在传统的基音提取方法中,错误的产生可以分为两类:1)来自分析方法的外在因素,例如由于分析窗的形状、宽度和位置的不适当而产生的不理想的信号表示等等;2)语言信号本身存在的内在因素,例如存在强的谐波分量或次谐波分量等等。实际上,在大多数传统系统中采用的固定帧长和帧的移位对它们的大部分严重基音误差是有影响的。在本文中,我们综合使用活动的波形分析、可数分析窗和可变帧率来解决第一类错误;另外用几个新方法来对付第二种情况产生的误差。利用男、女发音员的语言材料进行试验,结果证实了我们所提出的方法的正确性。

关键词：基音提取分析窗新系统语言信号内在因素传统系统变帧率短时分析信号表示自相关函数

Disruption of neuronal actin barrier promotes the entry of disease-implicated proteins to exacerbate amyotrophic lateral sclerosis pathology

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Neural Regeneration Research 2025年第9期20卷 2589-2590页

作者： Mikio shimizu Tatsusada Okuno Department of Neurology Osaka University Graduate School of MedicineSuitaJapan Department of Neurology Osaka General Medical CenterOsakaJapan

Amyotrophic lateral sclerosis(ALS)is a devastating neurological disease characterized by the accumulation of aberrant proteins in motor neurons of the brain and spinal *** with ALS develop skeletal muscle weakness,resulting in death from respiratory paralysis,which usually occurs 2-4 years after clinical onset(Goutman et al.,2022).

关键词： al. paralysis sclerosis