检索结果-南通市图书馆

Journal of Materials Science & Technology 2007年第3期23卷 392-394页

作者： Weimin MAO Dong LI yongning yu Department of Materials University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

The image stress of straight screw dislocations parallel to the medium surface covered by thin heterogeneous films was analyzed and deduced, in order to calculate the image shear stress. The relationship between image stress and distance from the screw dislocation to the interface of pure aluminum and its oxide covering was calculated based on the analysis. It was shown quantitatively that a sign conversion of the image stress appears in the case of thin oxide covering, while dislocation would pile up near the interface because of the possible slips of the screw dislocations induced by the image stress, which might break down the very thin oxide covering. Further investigation on edge dislocations or other dislocation configurations need to be done.

关键词： Dislocation Image force Interface Surface Aluminum Oxide film Stress

Measurement and Simulation of Grain Size in Strong Textured and Coarse-Grained Metal Sheets

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2003年第z1期19卷 115-116页

作者： Leng CHEN Weimin MAO yongning yu Huiping FENG Department of Materials University of Science and Technology Beijing Beijing 100083 China Department of Materials University of Science and Technology Beijing Beijing 100083 China Department of Materials University of Science and Technology Beijing Beijing 100083 China Department of Materials University of Science and Technology Beijing Beijing 100083 China

An X-ray diffractometer that equipped with a two-dimensional detector is used for developing the technique of grainsize measurement for strong textured and coarse-grained Si steel sheet. The method is based on the concept thatthe position of diffraction spots depends on the orientation of individual grains. The two-dimensional detector hasthe ability to collect abundant diffraction information in seconds, thus it can be determined rapidly and accuratelywhether a series of diffraction spots come from the same grain. The experimental results show that this method canbe used for measuring grain size and its distribution in strong textured and coarse-grained metal sheets.

关键词： Grain size, Texture, Two-dimensional detectorLeng

Stable dislocation configuration in the surface layer of metals

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第13期52卷 1864-1866页

作者： LI Dong MAO WeiMing yu yongning Department of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The stable dislocation configuration in the surface layer of metals was calculated according to dislo-cation energy theory. It was shown that the stable dislocation configuration was only influenced by Burger's vector... 详细信息

关键词：金属表面断裂稳定性实验

Influence of reaction stresses induced by dislocation slips onthe orientation evolution in bcc metals

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2003年第2期48卷 204-207页

作者： MAO Weimin CHEN Leng yu yongning Department of Materials University of Science and Technology BeijingBeijing 100083China

A plastic deformation model for bcc metals is proposed in consideration of reaction stresses. The shear strains and the corresponding reaction stresses induced by the activation of dislocations are calculated in the model, which will influence the following dislocation activation. The rolling texture in bcc metals is simulated up to 80% reduc-tion, while the ratio of critical resolved shear stresses be-tween the dislocations slipping on the {110} and {112} planes is chosen as 0.95. The corresponding calculation is also con-ducted with the activation of second dislocation, if the dif-ference between the orientation factor of the two dislocations with maximal orientation factors is lower than 5%. It is shown that the simulated texture is closer to that of the 80% rolled interstitial free steels than other modeling. It is be-lieved that the new model can give more attention to both of the strain and stress continuities during the plastic deforma-tion of polycrystalline metals, and therefore approaches closer to the real deformation process in bcc metals.

关键词： bcc metals plastic deformation texture stress strain simulation

Precipitatation Behavior of FeTiP Phase in High Strength IF Steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2000年第3期14卷 197-203页

作者： Zisu Zhao, Weimin Mao, yongning yu (University of Science and Technology Beijing, Beijing 100083, China) University of Science and Technology Beijing Beijing 100083 China

The influence of chemical composition and annealing parameters on the behavior of FeTiP precipitation has been investigated. With increasing Ti content the yield strength and tensile strength were reduced, and the tendency of FeTiP precipitation became more remarkable. No FeTiP precipitate was observed and the best mechanical properties have been obtained in the steel sheet, of which the atom ratio of Ti to N is approximately equal to 1. In the temperature range of 700 to 800℃ the FeTiP precipitation could appear easily. The precipitation process was suppressed when the annealing temperature was below 600℃, and the FeTiP phase was dissolved above 900℃. The FeTiP precipitates would inhibit the migration of grain boundaries during the recrystallization in certain extent, and weaken the density of {111} fiber texture, which resulted in the reduction of r value. The relationship between composition and processing parameters, as well as their influence on the mechanical properties is discussed.

关键词： IF steel FeTiP precipitation

INFLUENCE OF INITIAL TEXTRUE ON THE COLD ROLLING TEXTURE OF Ti SHEETS

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1995年第2期5卷 66-70页

作者： Mao, Weimin yu, yongning Li, Botao(University of Science and Technology Beijing, 100083 Beijing) Univ of Science and Technology Beijing Beijing China

ＩＮＦＬＵＥＮＣＥＯＦＩＮＩＴＩＡＬＴＥＸＴＲＵＥＯＮＴＨＥＣＯＬＤＲＯＬＬＩＮＧＴＥＸＴＵＲＥＯＦＴｉＳＨＥＥＴＳ￥Ｍａｏ，Ｗｅｉｍｉｎ；Ｙｕ，Ｙｏｎｇｎｉｎｇ；Ｌｉ，Ｂｏｔａｏ（ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎ... 详细信息

ＩＮＦＬＵＥＮＣＥＯＦＩＮＩＴＩＡＬＴＥＸＴＲＵＥＯＮＴＨＥＣＯＬＤＲＯＬＬＩＮＧＴＥＸＴＵＲＥＯＦＴｉＳＨＥＥＴＳ￥Ｍａｏ，Ｗｅｉｍｉｎ；Ｙｕ，Ｙｏｎｇｎｉｎｇ；Ｌｉ，Ｂｏｔａｏ（ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙＢｅ...

关键词： Ti Rolling Texture ODF

Nucleation of Cold Rolled FeCo Alloy during Annealing and Its Influence on the Formation of Recrystallization Texture

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第5期16卷 543-545页

作者： Guohui ZHU, Weimin MAO+ and yongning yu (Department of Metal Materials, University of Science and Technology Beijing, Beijing 100083, China) Department of Metal Materials University of Science and Technology Beijing Beijing 100083 China

The orientation distribution of recrystallization grains formed during annealing, as well as their misorientation relationship to the deformation matrix in cold rolled FeCo alloy have been investigated. It was found that most of the recrystallization nuclei were located near the boundary area with rather random orientations, and their misorientation angles to the deformation matrix were generally very high. However a few nuclei were also observed inside the deformation grains, to which they had very similar orientations. Therefore the misorientation angles between the nuclei and the deformation matrix were generally very low. The orientation and the misorientation distributions of the nuclei have very strong influence on the recrystallization process which could result in a very weak recrystallization texture. The corresponding mechanism is discussed.

关键词： In Nucleation of Cold Rolled FeCo Alloy during Annealing and Its Influence on the Formation of Recrystallization Texture

Texture Evaluation of α_2 Phase in Ti-25Al-10Nb-3V-1Mo Alloy Sheet

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1996年第5期12卷 361-364页

作者： Weimin MAO yongning yu Hong YANG and Bo SONG (Dept. of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China) Dept. of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The texture evaluation of α2 phase in Ti-25Al-10Nb-3V-1Mo sheet during rolling and annealing has been investigated by means of microstructure observation and ODF analysis. From the weak initial {1010} (1210) and {0001}(1210) textures a {1210}(1010) texture and a {0001}(uvtw)fibre texture are formed after cold rolling. The {0001} (1210) texture is also strengthened simultaneously. The activation process of slip systems is discussed concerning formation of the rolling texture. Because of the disappearance of {0001} (nvtw) fibre texture the primary recrystallization process should occur and the {1210}(1010) texture forms during annealing

关键词： Al Phase in Ti-25Al-10Nb-3V-1Mo Alloy Sheet Ti Mo Texture Evaluation of

神东矿区立体帷幕注浆精准堵漏风与高效防灭火技术

在线全文

学校读者我要写书评

暂无评论

煤矿安全 2024年第9期55卷 40-47页

作者：贺兵兵王青祥许亚优于永宁杨英兵何铖茂马驰骋许超王江龙李龙宋小林国家能源集团矿井通风安全与职业健康防护研究中心内蒙古鄂尔多斯017209 中国神华能源股份有限公司神东煤炭分公司陕西神木719300 中国矿业大学江苏徐州221116 中煤科工集团重庆研究院有限公司重庆400037 中煤科工西安研究院(集团)有限公司陕西西安710077

为高效治理神东矿区浅埋藏煤层开采漏风引起的煤自燃隐患,以大柳塔煤矿活鸡兔井12_上、12_下煤层工作面为研究对象,通过立体帷幕注浆的方式进行精准堵漏风与防灭火工程示范。首先利用地质剖面移动角计算注浆距离,并设计注浆平面布置,同... 详细信息

为高效治理神东矿区浅埋藏煤层开采漏风引起的煤自燃隐患,以大柳塔煤矿活鸡兔井12_上、12_下煤层工作面为研究对象,通过立体帷幕注浆的方式进行精准堵漏风与防灭火工程示范。首先利用地质剖面移动角计算注浆距离,并设计注浆平面布置,同时针对不同地质情况,设计了先导钻孔、注浆钻孔和监测钻孔;根据活鸡兔井实际情况,共施工104个钻孔,设计帷幕体长度约1020 m,高度约40 m;通过分段上行式注浆法,设计工作面切眼外侧注浆高度72 m,12_上205运输巷段注浆高度12 m,注浆宽度15 m,总注浆169569.1 m^(3)。通过立体帷幕注浆,12_下205工作面漏风较同条件下最大减少约1000 m^(3)/min,12_下207工作面漏风较同条件下最大减少近800m^(3)/min;堵漏风效果明显,有效降低12_下煤层工作面煤自燃隐患。

关键词：神东矿区帷幕注浆堵漏风分段上行式注浆法防灭火

Cold Rolling Texture in Ordered CuZn Alloy

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 1997年第1期11卷 21-23页

作者： ZHU Guohui MAO Weimin yu yongning(Department of Materials Science and Engineering, USTB, Beijing 100083, China)

The texture of 80% cold rolling CuZn ordered alloy was investigated. The development of rolling texturein 50%Cu-50%Zn(at.) alloy has been characterized by a inhomogenous {111} fiber texture with strong {111} component, which is significantly different from the conventional Cu-Zn alloys. The main characters of cold rollingtextures in ordered CuZn alloy are obviously similar to that in IF steel with bcc structure or ordered Fe3A1-basedalloys with imperfect B2 structure. From the rolling texture obtained by experiments and simulations,it can be estimated that main deformation mechanism are characterized by the activation of slip systems with Burgersvector in CuZn ordered alloy.

关键词： cold rolling rolling texture ordered CuZn alloy