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Chinese Physics B 2017年第12期26卷 427-431页

作者： sergey konovalov Dmitry Zagulyaev 陈希章 Victor Gromov Yurii Ivanov Samara National Research University Samara 443086 Russia Wenzhou University Wenzhou 325035 China Siberian State Industrial University Novokuznetsk 654007 Russia Institute of High Current Electronics of the Siberian Branch of the Russia Academy of Sciences Tomsk 634055 Russia

Commercially pure polycrystalline aluminum of grade A85, as a test material, is investigated. Using scanning and transmission electron microscopy the aluminum fine structure and fracture surface are analyzed. Fractures are studied in the regime of creep with and without a simultaneous effect of 0.3-T magnetic field. It is found that the application of a magnetic field in a linear stage of creep leads to substructure imperfection increasing. Furthermore, the magnetic field effect on aluminum in the process of creep causes the average scalar density of dislocations to increase and induces the process of dislocation loop formation to strengthen. Fractographic investigation of the fracture surface shows that in the fibrous fracture zone the average size of plastic fracture pits decreases more than twice under creep in the condition of external magnetic field compared with in the conventional experimental condition. In a shear zone, the magnetic field causes the average size of fracture pits to decrease. Experimental data obtained in the research allow us to conclude that the magnetic field effect on aluminum in the process of creep leads to the fracture toughness value of the material decreasing, which will affect the state of defect substructure of the volume and surface layer of the material. The influence of the magnetic field is analyzed on the basis of the magneto-plasticity effect.

关键词： aluminum magnetic field creep structure

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激光直接沉积CoCrFeNiMn高熵合金:气孔-组织结构-拉伸性能之间的关系

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材料工程 2022年第3期50卷 43-49页

作者：苏传出陈希章 sergey konovalov 卢淑媛闻明王艳虎温州大学机电工程学院浙江温州325800 萨马拉国立研究大学金属技术与航空材料系俄罗斯萨马拉443086 中华人民共和国常熟海关江苏常熟215500 昆明贵金属研究所稀贵金属综合利用国家重点实验室昆明650106

采用激光直接沉积技术成功制备等原子CoCrFeNiMn高熵合金。研究沿试样沉积高度方向上的气孔的大小、数量和组织结构及室温(293 K)和低温(77,200 K)下试样的拉伸性能。结果表明:CoCrFeNiMn合金表现出定向结晶规律,在合金底部区域晶界处... 详细信息

采用激光直接沉积技术成功制备等原子CoCrFeNiMn高熵合金。研究沿试样沉积高度方向上的气孔的大小、数量和组织结构及室温(293 K)和低温(77,200 K)下试样的拉伸性能。结果表明:CoCrFeNiMn合金表现出定向结晶规律,在合金底部区域晶界处形成伴有长形气孔的树枝状柱状晶,随着区域靠近试样顶部,晶粒形态转变为等轴晶粒。而在试样顶部区域,气孔形状呈圆形且数量大大降低。比较在77,200 K和293 K温度下的合金的相应拉伸性能可知:试样顶部区域选取的77 K拉伸试样具有更好的性能,但在中部区域的293 K拉伸试样和在底部区域中的200 K拉伸试样的伸长率相似,这是由于试样不同的气孔率和组织结构的差异所致。

关键词：激光直接沉积技术 CoCrFeNiMn 气孔组织拉伸性能

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激光冲击强化对钛合金疲劳寿命影响综述

中国表面工程 2022年第2期35卷 103-112页

作者：钱丽艳王艳虎戴峰泽 konovalov sergey 闻明陈希章温州大学机电工程学院温州325035 萨马拉国立研究型大学金属技术与航空材料系萨马拉443086俄罗斯江苏大学机电工程学院镇江212013 昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室昆明650106

对提升钛合金零件的疲劳强度,已有相关技术的试验研究,但缺乏对技术的系统介绍,阻碍了该技术的产业化应用。通过整理大量试验数据及其结果,就激光冲击强化对钛合金零件的疲劳特性的影响展开分析。简要介绍激光冲击强化技术的发展状况,... 详细信息

对提升钛合金零件的疲劳强度,已有相关技术的试验研究,但缺乏对技术的系统介绍,阻碍了该技术的产业化应用。通过整理大量试验数据及其结果,就激光冲击强化对钛合金零件的疲劳特性的影响展开分析。简要介绍激光冲击强化技术的发展状况,分别从表面形貌、残余应力、微观组织、硬度、表面粗糙度等方面进行分析总结。结果发现,当激光脉冲能量为7 J时,材料塑性变形量最大;当激光功率密度为3 GW/cm^(2),材料表面残余压应力值最高;当冲击次数达到5次以上时,材料表层的位错密度不断增大;当在工件表面覆盖一层高强度的光滑金属接触膜时,材料表面粗糙度将降低。综合数据可知激光功率密度及冲击次数对钛合金疲劳寿命的影响最大。整理了大量试验数据,可为得到最佳的激光冲击强化效果及提升疲劳寿命提供理论参考。

关键词：激光冲击钛合金疲劳强度表面形貌残余应力力学性能

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Microalloyed Engineering Steels

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Microalloyed Engineering Steels

Diclofenac sodium aqueous systems at low concentrations: Interconnection between physicochemical properties and action on hydrobionts

中国金属学会特殊钢分会理事会暨2013年汽车零部件用高品质特殊钢研讨会

作者： BLECK Wolfgang konovalov sergey PRAHL Ulrich Steel Institute RWTH Aachen University

Microalloying has been successfully applied for various steel made long products in order to improve component performance or to ease *** might contribute to cost savings due to optimized or substituted heat treatments,it can improve the balance of strength and toughness or improve the cyclic behavior due to improved *** approaches are to provide damage tolerant matrix behavior and by this to increase the service lifetime in high strength *** to the well-known application of microalloying for flat products,the use of Niobium,Titanium and Vanadium in steels with higher C content and during long process chains requests for specific materials and process design *** paper deals with the beneficial options for the control of austenite grain size and transformation kinetics as well as with the constraints for dissolution, precipitation coarsening and segregation effects.

关键词： Engineering Steels Microalloying Forging Steels Case hardening Damage tolerance C-solution

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Journal of Environmental Sciences 2020年第2期32卷 177-186页

作者： Irina S.Ryzhkina Yuliya V.Kiseleva Lyaisan I.Murtazina Tatyana V.Kuznetsova Erik R.Zainulgabidinov Igor V.Knyazev Andrew M.Petrov sergey E.Kondakov Alexander I.konovalov Arbuzov Institute of Organic and Physical Chemistry FRC Kazan Scientific CenterRussian Academy of Sciences8 Arbuzov str.Kazan 420088Russia Institute for Problems of Ecology and Mineral Wealth Use of Tatarstan Academy of Sciences 28 Daurskaya Str.Kazan 420087Russia Lomonosov Moscow State University Chemistry Dept.1/3 Lenin HillsMoscow 119899Russia

Diclofenac sodium(DS) is a widely used nonsteroidal anti-inflammatory drug(NSAIDs).NSAIDs are poorly removed during standard wastewater *** consequences of the presence of NSAIDs in rivers and lakes at 10-11–10-8 mol/L are not yet established;therefore, ecotoxicologists have focused their efforts on studying the effect of lowconcentration NSAIDs on fish and hydrobionts, and also on predicting the potential risks to *** provides some information about the bioeffects of some NSAID solutions in low concentrations but there is no physicochemical explanation for these *** the physicochemical patterns of DS solutions in the low range of concentrations and establishing an interconnection between the solutions’ physicochemical properties and bioeffects can provide a conceptually new and important source of information regarding the unknown effects of *** physicochemical properties and action of DS solutions on Ceriodaphnia affinis cladocerans,Paramecium caudatum infusoria, Chlorella vulgaris unicellular green algae, as well as on the growth of the roots of Triticum vulgare wheat seeds, were studied in the calculated concentration range of 1 × 10-3–1 × 10-18 mol/*** relationship between these phenomena was established using the certified procedures for monitoring the toxicity of natural water and *** was shown for the first time that water solutions of DS are dispersed systems in which the dispersed phase undergoes a rearrangement with dilution, accompanied by changes in its size and properties, which affects the nonmonotonic dependences of the system’s physicochemical properties and could cause nonmonotonic changes in action on hydrobionts in the low concentration range.

关键词： Diclofenac sodium Low concentration Aqueous solutions Physicochemical properties Hydrobionts Toxicity

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