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Effects of ni content and tempering temperatures on microstructure and properties of medium-carbon cast steel

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Journal of Iron and Steel Research International 2023年第8期30卷 1524-1536页

作者： Xiao-bo Cui Tian-long Liu Zhi-bin Zheng Zhi-qiang Guo Kai-hong Zheng Pei-xian Han School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Institute of New Materials Guangdong Academy of SciencesNational Engineering Research Center of Powder Metallurgy of Titanium and Rare MetalsGuangdong Provincial Key Laboratory of Metal Toughening Technology and ApplicationGuangzhou 510651GuangdongChina Guangdong Provincial Iron Matrix Composite Engineering Research Center Guangzhou 510651GuangdongChina Jiangxi Lianfeng Investment Casting Co. Ltd.Yichun 336300JiangxiChina

The microstructure evolution and properties of medium-carbon cast steel alloyed with different ni contents after tempering at various temperatures have been *** addition of 0.47-1.59 wt.%ni content results in the formation of 16%-36% retained austenite(RA).The blocky and irregular-polygonal RA mainly forms along the prior austenite grain boundaries,and the tempering temperature does not affect the RA *** hardness of medium-carbon cast steel is affected by the precipitation of carbides and the hardness of *** RA content is the main cause of intergranular impact rupture and low impact *** long-strip carbides formed after tempering at 320℃ would further reduce the impact energy of medium-carbon cast *** tempering at 220 and 380℃,the increase in impact energy is attributed to the formation of rod-like and spherical carbides and the low-carbon *** the medium-carbon cast steel with high impact energy,its impact-abrasive wear resistance is more ***-cutting and delamination are the primary wear mechanisms.

关键词： Medium-carbon cast steel ni content Tempering temperature Hardness Impact energy Impact-abrasive wear resistance

Effects of ni content on the cast and solid-solution microstructures of Cu-0.4wt% Be alloys

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International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 641-651页

作者： Shuang-jiang He Yan-bin Jiang Jian-xin Xie Yong-hua Li Li-juan Yue Key Laboratory for Advanced Materials Processing of Ministry of Education Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology Beijing Beijing 100083 China CNMC ningxia Orient Group Co. Ltd. Shizuishan 753000 China

The effects of ni content（0–2.1wt%）on the cast and solid-solution microstructures of Cu-0.4wt%Be alloys were investigated,and the corresponding mechanisms of influence were *** results show that the amount of precipitated phase increases in the cast alloys with increasing ni *** the ni content is 0.45wt%or 0.98wt%,needle-like Be_（21）ni_5 phases form in the grains and are mainly distributed in the interdendritic *** the ni content is 1.5wt%or greater,a large number of needle-like precipitates form in the grains and chain-like Be_（21）ni_5 and Be ni precipitates form along the grain *** addition of ni can substantially refine the cast and solid-solution microstructures of Cu-0.4wt%Be *** hindering effects of both the dissolution of ni into the matrix and the formation of Be–ni precipitates on grain-boundary migration are mainly responsible for refining the cast and solid-solution microstructures of Cu-0.4wt%Be *** ni contents result in finer microstructures;however,given the precipitation characteristics of Be–ni phases and their dissolution into the matrix during the solid-solution treatment,the upper limit of the ni content is 1.5wt%–2.1wt%.

关键词： beryllium-copper alloys alloying ni content microstJ-ucture solid-solution treatment

Role of ni content in improvement of corrosion resistance of Zn-ni alloy in 3.5% Na Cl solution. Part I: Polarization and impedance studies

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Transactions of Nonferrous Metals Society of China 2015年第8期25卷 2807-2816页

作者： Hany M.ABD EL-LATEEF Abdel-Rahman EL-SAYED Hossnia S.MOHRAN Chemistry Department Faculty of Science Sohag University

Zn plays an important role in the protection of iron and steel from corrosion in sea water, and the alloying of Zn and ni can improve its corrosion resistance. The corrosion behavior of Zn？ni alloys in synthetic sea water （3.5% NaCl, mass fraction） was studied using Tafel plot and electrochemical impedance spectroscopy （EIS） techniques. The corrosion resistance of the investigated alloys with various ni contents （0.5%？10%, mass fraction） was compared with that of Zn. The results show that the corrosion resistance of Zn？ni alloys （except 0.5% ni） is superior to that of Zn. The 10% ni gives the highest corrosion resistance due to the formation ofγ-Zn3ni withγ-Znni phases in the alloy. In the case of alloy I （0.5% ni）, it exhibits a higher corrosion rate （less corrosion resistance） than Zn.

关键词： Zn-ni alloy ni content corrosion resistance Cl- ions impedance polarization

Effects of temperature and nickel content on magnetic properties of ni-doped ZnO

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Rare Metals 2006年第z2期25卷 24-29页

作者： REN Lingling JEUNG Won Young Korea-China Advanced Materials Cooperation Center KIST Korea Korea-China Advanced Materials Cooperation Center KIST Korea

Magnetic properties of diluted magnetic semiconductors (DMSs), ni-doped ZnO materials, prepared by sol-gel method were investigated by measuring magnetization as functions of magnetic field. The ni content affects the magnetic properties at low sintered temperature but it has few effects on the magnetic properties at high sintered temperature. The sintered temperature has great effects on the magnetic properties of ni/ZnO at high original mole ratio of ni/Zn while it has slight effects on the magnetic properties of ni/ZnO at low original mole ratio of ni/Zn whatever low or high sintered temperature.

关键词： diluted magnetic semiconductor ni-doped ZnO magnetic properties sol-gel sintered temperature ni content

Hydrogen storage thermodynamics and kinetics of as-cast Ce-Mg-ni-based alloy

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Journal of Iron and Steel Research International 2024年第3期31卷 752-766页

作者： Yan Qi Xin Zhang Jun Li Dong-liang Zhao Shi-hai Guo Yang-huan Zhang Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China China Rare Earth New Material(Weishan)Co..Ltd. Jining 277600ShandongChina Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina

The reaction kinetics of alloys based on magnesium are known to be greatly improved by the partial substitution of Mg with rare earths and transition metals,particularly *** enhanced superficial hydrogen dissociation rate,the weakened Mg-H bond and the lower activation energy following element replacement are thought to be related to the better *** experimental alloys Ce5Mg_(95-x)ni_(x)(x=5,10,15)were smelted by the vacuum induction *** phase transformation and structural evolution of experimental alloys before and after reaction with hydrogen were char-acterized by X-ray diffraction,scanning electron microscopy and transmission electron *** cast specimens contain CeMg_(12),Mg and Mg_(2)ni phases,and the increase in ni content results in an obvious growth of Mg_(2)ni *** isothermal and non-isothermal hydrogenation and dehydrogenation kinetics of the experimental specimens were investi-gated using the Sievert apparatus,differential scanning calorimetry and thermal gravimetric *** activation energy may be calculated using the Arrhenius and Kissinger *** experimental alloys have been shown to have good activation properties,with a reversible hydriding and dehydriding capacities of around 5.0 wt.%in the first *** initial dehydrogenation temperature of MgH_(2) decreases from 557.5 to 537.7 K with changing ni content from 5 to 15 at.%.The dehydrogenation activation energy also reduces from 77.09 to 62.96 kJ/mol,which explains the improved hydrogen storage performance caused by ni *** can be shown that the impact of ni on the decomposition enthalpy of MgH_(2) is quite modest,with the absolute enthalpy(ΔHr)only decreasing from 78.48 to 76.15 kJ/mol.

关键词： Mg-based alloy ni content Hydrogen storage kinetics Thermodynamic property Activation energy

Effect of cyclic heat treatment on abnormal grain growth in Fe-Mn-Al-based shape memory alloys with different ni contents

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Journal of Materials Science & Technology 2023年第22期153卷 8-21页

作者： Huabei Peng Liqiu Yong Yang Zuo Jiazhen Yan Hui Wang Yuhua Wen School of Mechanical Engineering Sichuan UniversityChengdu 610065China Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu 610106China

Cyclic heat treatment that can continuously promote abnormal grain growth is widely used for the prepa-ration of single-crystal Fe-Mn-Al-based shape memory ***,it takes a long time to prepare large-size Fe-Mn-Al-based alloy single crystals via the reported cyclic heat ***,the long-time cyclic heat treatment at high temperatures leads to the development of defects including oxidation and a decrease in Mn,which would deteriorate superelasticity in the Fe-Mn-Al-based shape memory *** shorten the fabrication time of single crystals,the effect of the cyclic heat treatment process on the abnormal grain growth in the Fe-Mn-Al-based alloys with different ni contents was systematically *** is found that the abnormal grain growth of Fe-Mn-Al-based alloys was not significantly affected by the ni contents(within 2.1 at.%-6.2 at.%).In addition,the abnormal grain growth could be promoted by 1-2℃ min^(-1) cooling rate,high solution temperature,and multiple cycles,while it was insensitive to other processes including heating rate,dual-phase time as well as long-time solution *** findings can guide optimizing the fabrication process of single crystals by cyclic heat ***,the Fe_(41.9)Mn_(37.8)Al_(14.1) ni_(6.2) single crystal prepared by the optimized cyclic heat treatment showed a recoverable strain of about 4%.

关键词： Cyclic heat treatment ni content Abnormal grain growth Fe-Mn-Al-based shape memory alloy Superelasticity

Microstructure, hydrogen storage thermodynamics and kinetics of La_5Mg_(95-x)ni_x(x=5, 10, 15) alloys

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Transactions of Nonferrous Metals Society of China 2019年第5期29卷 1057-1066页

作者： Zhen-yang LI Sheng-li LI Ze-ming YUAN Yang-huan ZHANG Yan QI School of Materials Science and Engineering Shandong UniversityJi’nan 250061China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China

The microstructure, hydrogen storage thermodynamics and kinetics of La5Mg95-xnix (x=5, 10, 15) ternary alloys with different ni contents were investigated. The evolutions of the microstructure and phase of experimental alloys were characterized by X-ray diffractometry and scanning electron microscopy. The hydrogen storage kinetics and thermodynamics, and P-C-I curves were tested using a Sievert apparatus. It is found that increasing ni content remarkably improves hydrogen storage kinetics but reduces the hydrogen storage capacity of alloys. The highest hydrogen absorption/desorption rate is observed in the La5Mg80ni15 alloy, with the lowest hydrogen desorption activation value being 57.7 kJ/mol. By means of P-C-I curves and the van’t Hoff equation, it is determined that the thermodynamic performance of the alloy is initially improved and then degraded with increasing ni content. The La5Mg85ni10 alloy has the best thermodynamics properties with a hydrogenation enthalpy of -72.1 kJ/mol and hydrogenation entropy of -123.2 J/(mol·K).

关键词： hydrogen storage Mg-based alloys thermodynamics performance kinetics performance ni content

Role of nickel alloying on anodic dissolution behavior of zinc in 3.5% NaCl *** II:Potentiodynamic,potentiostatic and galvanostatic studies

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Transactions of Nonferrous Metals Society of China 2015年第9期25卷 3152-3164页

作者： Hany M.ABD EL-LATEEF Abdel-Rahman EL-SAYED Hossnia S.MOHRAN Chemistry Department Faculty of ScienceSohag University

Zinc is common metal used for steel protection from *** addition of further element,such as ni,can modify the corrosion rate and maintain sacrificial *** anodic dissolution behavior of Zn,ni and Zn-ni alloys with different ni contents（from 0.5% to 10%,mass fraction） in 3.5% Na Cl solution was investigated using potentiodynamic,potentiostatic and galvanostatic *** composition and microstructure of the corrosion layer on Zn,ni and Zn-ni alloys were characterized by energy-dispersive X-ray spectroscopy analysis（EDX） and scanning electron microscopy（SEM）.The galvanostatic curves show that the anodic behavior of all investigated electrodes exhibits active/passive transition and the tendency of the alloys to passivity decreases with the increase in ni content,except for 99.5Zn-0.5ni *** the potentiodynamic curves exhibit active passive transition only for pure *** analysis reveals the presence of oxides,chlorides and metal hydroxide chloride in corrosion products,and very small cracks are observed for 90Zn-10 ni alloy compared with that of Zn.

关键词： corrosion NaCl solution ni content Zn-ni alloy anodic behavior

Surface plasmon resonance and electrical properties of RF: magnetron sputtered carbon–nickel composite films at different annealing temperatures

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Rare Metals 2016年第11期35卷 863-869页

作者： Vali Dalouji S.Mohammad Elahi Sirvan Naderi Department of Physics Malayer University Plasma Physics Research Center Science and Research BranchIslamic Azad University Department of Physics Kermanshah BranchIslamic Azad University

In this work, the optical absorption spectra of carbon-nickel films annealed at different temperatures（300-1000 ℃） with a special emphasis on the surface plasmon resonance（SPR） were investigated. The films were grown on quartz substrates by radio-frequency（RF）magnetron co-sputtering at room temperature with a deposition time of 600 s. The optical absorption peaks due to the SPR of ni particle are observed in the wavelength range of 300-330 nm. With annealing temperature increasing up to 500 ℃ due to the increase in ni particle size, the intensity of the SPR peaks increases, but weakens with annealing temperature increasing over 500 ℃. The ni nanoparticle size, the dielectric function of carbon matrix（ε_m） and the plasma frequency of the free electrons（ω_p） at500 ℃have the maximum values of 21.63 nm, 0.471 and5.26 9 10^（15）s^（-1）, respectively. The absorption peak shows a redshift trend up to 500 ℃and then turn to blueshift with annealing temperature increasing over 500 ℃ These observations are in a good agreement with the electrical measurements in temperature range of 15-520 K and the Maxwell-Garnett（M-G） effective medium theory（EMT）.

关键词： Surface plasmon resonance Carbon-nickelfilms ni content Annealing temperatures Electricalresistivity