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Effects of impact energy on the wear resistance and work hardening mechanism of medium manganese austenitic steel

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Friction 2017年第4期5卷 447-454页

作者： Hui CHEN Dong ZHAO Qingliang WANG Yinghuai QIANG Jianwei QI School of Materials Science and Engineering China University of Mining & TechnologyXuzhou 221116ChinaJiangsu Key Laboratory of Large Engineering Equipment Detection and ControlXuzhou Institute of TechnologyXuzhou 221111China School of Materials Science and Engineering China University of Mining & TechnologyXuzhou 221116China

Medium manganese austenitic steel (MMAS) fabricated through the hot rolling process has been used in the mining,military,and mechanical *** this paper,the abrasion performance and hardening mechanism were measured under a series of impact *** impact wear was tested at different impact energies from 0.5 J to 6 J using a dynamic load abrasive wear tester (MLD-10).Microstructure and surface morphologies were analyzed using scanning electron microscopy,X-Ray diffraction,and transmission electron *** results suggest that MMSA has the best wear resistance at 3.5 J and the worst wear resistance at 1.5 ***,the wear mechanism and worn surface microstructure change with different impact *** are small differences between a large amount of martensite on the worn surfaces under different impact energies and the shapes of dislocation and twins change with different impact energies.

关键词： medium manganese steel impact abrasion wear work hardening twin martensite dislocation

Sub-shot-noise measurement for slight absorption

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Science China Mathematics 1998年第5期41卷 534-540页

作者：王海潘庆张云薛晨阳谢常德彭堃墀 Institute of Opto-electronics Shanxi University Taiyuan China

Sub\|shot\|noise measurement for slight absorption is experimentally achieved with the twin beams of quantum correlation. The improvement in signal\|to\|noise ratio of 2.5 dB relative to the SNL is obtained. The exper... 详细信息

关键词： twin beams shot\|noise limit photocurrent fluctuations signal\|to\|noise ratio

Self-energy and interaction energy of stacking fault in fcc metals calculated by embedded-atom method

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Science China(Technological Sciences) 2000年第2期43卷 146-153页

作者：何刚戎咏华徐祖耀 School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China

The stacking fault energies of five fcc metals (Cu, Ag, Au, Ni and Al) with various quantivalences have been calculated by embedded-atom method (EAM). It indicated that the stacking fault energy is mainly determined by the metallic bond-energy and the lattice constant. Thus, monovalent fcc metals should have different stacking fault energies, contracy to Attree’s conclusion. The interaction energy between stacking faults one {111} layer apart in a fcc metal is found to be 1/40–1/250 of its self-energy, while it becomes zero when the two stacking faults are two layers apart. The twin energy is just half of the energy of intrinsic stacking fault energy without the consideration of lattice relaxation and the energy of a single intrinsic stacking fault is almost the same as that of extrinsic stacking fault, which are consistent with the results from the calculation of Lennard-Jones force between atoms, but differ from Attree’s result.

关键词： EAM stacking fault energy twin energy interaction energy.

ON THE M_7C_3 IN Cr27 CAST IRON

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Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 459-464页

作者： LI Yuqing WANG Cirong GU Zhaofeng Research Institute of Daye Steel Works,Huangshi,China Senior Engineer,Research Institute of Daye Steel Works,Huangshi 435001,China Research Inst of Daye Steel Works Huangshi China

Determination of(Fe,Cr)_7C_3 in Cr27 cast iron results about 30 v.-%.Minor Si and Mn are *** area of the M_7C_3 grains is 1—50μm^*** matrix analysis of elec- tron diffraction pattern with calculated angle between plane traces,{011}twins and also {013}twins producing local environment for Ru_7B_3 are observed in the orthorhombic M_7C_3. A crystallographic model for M_7C_3 is proposed.

关键词： cast iron M_7C_3 twin plane trace Cr 27

EXPLOSIVE HARDENING OF HIGH Mn STEEL

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Acta Metallurgica Sinica(English Letters) 1991年第9期4卷 164-167页

作者： LI Mingshan ZHAO Shida Institute of Mechanics,Academia Sinica,Beijing,ChinaSHI Guoshun Beijing Centre of Physical and Chemical Analysis,Beijing,China Acad Sinica Beijing China

The explosive hardening of high Mn Steel was simulated by using light gas gun under selected ranges of impact load from 10 to 20 GPa and pulse duration from 0.04 to 1.6μ*** experi- mental results showed that a lot of... 详细信息

关键词： high Mn steel explosive hardening twin dislocation

Serrated Flow Behavior during Compression at Elevated Temperatures in Mg-3Al-1Zn-0.1RE Alloy

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Journal of Materials Science & Technology 2009年第4期25卷 441-444页

作者： Wei Qiu Enhou Han Lu Liu Environmental Corrosion Center Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Shenyang National Laboratory for Material Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The deformation behaviour of an AZE （Mg-3Al-1Zn-0.1RE） alloy at temperature between 393 and 453 K was investigated by uniaxial compression tests carried out at initial strain rate values of 1×10-4, 5×10-4 and 1×10-3 s-1 in air. The results show that serrated flow occurs at the strain rate of 10-4 s-1 under all test temperatures and 5×10-4 s-1 at 453 K. The mechanism of serrated flow was proposed, which is mainly attributed to the interaction of dislocations to the precipitates.

关键词： AZE alloy Serrated flow Warm deformation twin

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Q690高强钢双丝CMT焊接接头组织分析

热加工工艺 2018年第21期47卷 250-253页

作者：刘朋韩善果易耀勇王金钊刘志聃国家医疗保健器具工程技术研究中心广东省医用电子仪器及高分子材料制品重点实验室广东省医疗器械研究所广东广州510500 广东省焊接技术研究所(广东省中乌研究院) 广东广州510650

用CMT twin焊接Q690高强钢厚板,利用金相显微镜、X射线衍射(XRD)和扫描电子显微镜(SEM)研究和分析了其焊接接头宏观形貌和微观组织。试验结果表明焊缝区镍元素含量高,能够细化晶粒。在其它条件相同时,X型坡口的厚板焊接速度大于V型坡口... 详细信息

用CMT twin焊接Q690高强钢厚板,利用金相显微镜、X射线衍射(XRD)和扫描电子显微镜(SEM)研究和分析了其焊接接头宏观形貌和微观组织。试验结果表明焊缝区镍元素含量高,能够细化晶粒。在其它条件相同时,X型坡口的厚板焊接速度大于V型坡口,减少了X型坡口焊接接头在相变点温度以上停留时间,从而使X型坡口焊接接头在热影响区和焊缝区的组织较细。试验结果表明X型坡口接头性能更加优异,为厚板Q690高强钢的焊接提供了重要依据。

关键词： CMT twin Q690 金相组织

Anisotropic and asymmetric deformation mechanisms of nanolaminated graphene/Cu composites

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Nano Materials Science 2019年第2期1卷 121-130页

作者： Shayuan Weng Huiming Ning Tao Fu Ning Hu Shu Wang Kaiyan Huang Xianghe Peng H. Jerry Qi Cheng Yan College of Aerospace Engineering Chongqing University Chongqing 400044 PR China Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China Chongqing University Chongqing 400044 PR China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 PR China The George W. Woodruff School of Mechanical Engineering Renewable Bioproduct Institute Georgia Institute of Technology Atlanta GA 30332 United States School of Chemistry Physics and Mechanical Engineering Science and Engineering Faculty Queensland University of Technology (QUT) 2 George Street G.P.O. Box 2434 Brisbane Australia

We conducted molecular dynamics (MD) simulations of tension and compression along the direction and MD simulations of compression along the and directions on nanolaminated graphene/Cu (NGCu) composites to investigate the effects of the incorporated graphene and the deformation mechanisms related to the loading direction. The deformation behavior and the defect structures were found to be strongly dependent on the loading conditions. An asymmetric tension-compression deformation behavior was thus found in graphene/Cu nanolaminates under the loading, which was dominated by stacking faults and deformation twins formed by dislocation slide under tension and compression, respectively. High density and ordered nanotwins were formed at the graphene/Cu interfaces. Two different formation mechanisms of the twins were found under the compression, and the nucleated twins were easy to be thickened with the assistance of the graphene wrinkles. Multiple twins were formed under the compression by the dislocation cross-slip. This study provides a way to introduce graphene reinforcement and twin boundary to Cu matrix composites and design nanotwinned graphene/Cu composites with excellent mechanical performance.

关键词： Deformation Mechanisms Molecular Dynamics Graphene/Cu Composites Interface twin

Characteristics of Mechanical Properties and Microstructure for 316L Austenitic Stainless Steel

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Journal of Iron and Steel Research International 2011年第11期18卷 53-59页

作者： SONG Ren-bo XIANG Jian-ying HOU Dong-po School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

A comparative study on mechanical properties and microstructure of 316L austenitic stainless steel between solution treated specimen and hot rolled specimen was conducted. After a specimen was subjected to solution treatment at 1 050 ℃ for 6 min, its mechanical properties were determined through tensile and hardness tests. Based on the true stress vs true strain and engineering stress vs engineering strain flow curves, the work hardening rate has been explored. The results show that the solution treated specimen has an excellent combination of strength and elongation, and that this steel is easy to work-hardening during deformation. Optical microscope, scanning electron micro- scope, transmission electron microscope and X-ray diffraction examinations were conducted, these reveal that twins in 316L austenitic stainless steel can be divided into suspended twin and transgranular twin which have different for mation mechanisms in growth, and that the deformation induced martensite nucleated and grown in the shear band intersections can be observed, and that the fracture surfaces are mainly composed of dimples and exhibit a tough fracture character.

关键词： 316L mechanical property twin martensite fracture morphology