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Electron Microscopy Analysis of Deformation Induced ε Martensite Transformation in an Fe-Mn-Si-Cr-Ni Alloy

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Journal of Materials Science & Technology 1994年第4期10卷 263-268页

作者： Fuxing YIN Jianxin ZHANG Ruixiang WANG and Nanju GU (Hebei Institute of Technology, tianjin, 300132, China)(To whom correspondence should be addressed)Kenichi Shimizu (Kanazawa Institute of Technology, Ishikawa, Japan) Hebei Inst of Technology Tianjin China

The configurations of stacking faults and morphologies of strain induced ε martensite plates in an FeMnSiCrNi alloy were investigated through electron microscopy analysis. The Shockley partial dislocation structures. sensitive to external stress. determine the configurations of stacking faults in γphase Partial dislocations at the front sides of stacking faults are usetul for the nucleation of εmartensite plates. The growth of ε martensite plates is accompanied with the disappearance of local pre-existing stacking faults, The ε martensite vanants behave in three morphologies of respective stopping. continuous penetrating and intersections with the formation of secondary ε martensite plates

关键词： Mn Electron Microscopy Analysis of Deformation Induced Martensite Transformation in an Fe-Mn-Si-Cr-Ni Alloy Fe Si Cr Ni

EFFECT OF TEMPERING IN PULSE MAGNETIC FIELD ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIGH SPEED STEEL

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Acta Metallurgica Sinica(English Letters) 1990年第2期3卷 116-122页

作者： XU Bojun GU Nanju YAN Dianran YIN Fuxing Hebei Institute of Technology,tianjin,China GU Nanju Division of Heat Treatment,Hebei Institute of Technology,tianjin 300132,China

Using a self-made pulse magnetic field heat treatment equipment with low or medium intensi- ty,the tempering process of high speed steel W6Mo5Cr4V2 was *** was found that the secondary hardening process and the transformation of retained austenite for the steel were accelerated by the pulse magnetic field,and the tempering period could be reduced to half of the *** was shown by the analyses of X-ray and eletron microscopy that the precipitation of carbides becomes more homogeneous and dispersive,and the tetragonality of martensite increases obviousely,which causes the improvement of hardness and red-hardness for the *** was confirmed that the service life of tools as centre bits,screw taps and punches for nuts could be increased by 0.4 to 1.4 times by the tempering in magnetic field.

关键词： pulse magnetic field magnetic heat treatment magnetic tempering

MODEL FOR INFILTRATION KINETICS OF LIQUID METALS AND ITS APPLICATION

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Acta Metallurgica Sinica(English Letters) 1992年第9期5卷 206-213页

作者： XIA Zhenhai Hebei Institute of Technology,tianjin,ChinaMAO Zhiying ZHOU Yaohe Northwestern Polytechnical University,Xi’an,China Doctor,Faculty of Foundry,Department of Mechanical Engineering No.2,Hebei Institute of Technology,tianjin 300132,China

On the basis of fluid kinetics,a model for infiltration kinetics of liquid metals into fibre pre- fabricated composite has been *** infiltration processing,together with the measurements of infiltrating velocity and permeability,for the C fibre-reinforced Al matrix composites have been *** model proposed seems to be in good agreement with the ex- perimental *** different infiltration modes,uniform and non-uniform,were found and a new technique was ***,the quality composites of C fibre-reinforced Al may be made under low pressure regardless of non-wettability of liquid metal to the fibres.

关键词： liquid metal infiltration C/Al composite

Effect of Austenite Pre-deformation on Isothermal Martensite Transformation in an Fe-20.5Ni-4.8Mn Alloy

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Journal of Materials Science & Technology 1995年第1期11卷 61-66页

作者： Fuxing YIN Jianxin ZHANG and Nanju GU(Hebei Institute of Technology, tianjin, 300132, China)Tsukio Tadaki(Institute of Science and Industrial Research, Osaka University, Japan)Ken,ichi Shimizu(Kanazawa Institute of Technology, Ishigawa 921, Japan) HEBEI INST TECHNOL TIANJIN 300132PEOPLES R CHINA OSAKA UNIV INST SCI & IND RESOSAKAJAPAN KANAZAWA INST TECHNOL KANAZAWAISHIKAWA 921JAPAN

With electron microscopy the investigation on isothermal martensite transformation in an Fe20.5Ni-4.8Mn alloy has been carried out to clarify the effect of austenite state on the transformation, by applying pre-deformation to austenite before isothermal holding. Under the condition without pre-deformation, the isothermal martensite products are lath martensite with {111}fhabit planes. Dislocations in austenite seem to contribute to nucleation of martensite, and in this nascent Stage austenite substructure has no obvious effect on martensite growth. The consequent thickening of martensite laths is apparently influenced by local austenite states, resulting in the changes in orientation, morphology as well as substructure of martensite lath. The kinetics of isothermal martensite transformation is controlled by intedece dislocation determined nucleation of martensite in primary stage, but to a larger extent, by the austenite accommodation for the shape strain of martensite in the thickening Stage

关键词： Mn Ni Fe Effect of Austenite Pre-deformation on Isothermal Martensite Transformation in an Fe-20.5Ni-4.8Mn Alloy Figure

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学科馆员的新工作

图书馆论坛 2004年第5期24卷 20-22页

作者：宿世明天津商学院图书馆天津300132

从自建数据库文献主题分类标引和学科分类标引及编制专业“主题、学科分类”和“关键词”

关键词：图书馆学科馆员制度主题标引分类标引关键词词表全文数据库

Improving on calculation of martensitic phenomenological theory

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Progress in Natural Science:Materials International 2003年第7期 54-57页

作者： DONG Guixia , GU Nanju and WANG Baoqi (1. Metal Material Institute, Hebei University of Technology, tianjin 300132, China 2. Department of Material Science and Engineering, tianjin Institute of Technology, tianjin 300191, China) Metal Material Institute，Hebei University of Technology，tianjin 300132，China Department of Material Science and Engineering，tianjin Institute of Technology，tianjin 300191，China Metal Material Institute，Hebei University of Technology，tianjin 300132，China

Exemplified by the martensitic transformation from DO3 to 18R in Cu-14. 2A1-4. 3Ni alloy and according to the principle that in variant-habit-plane can be obtained by self-accommodation between variants with twin relationships, and on the basis of displacement vector, volume fractions of two variants with twin relationships in martensitic transformation, habit-plane indexes, and orientation relationships between martensite and austenite after phase transformation can be calculated. Because no additional rotation matrixes are needed to be considered and mirror symmetric operations are used, the calculation process is simple and the results are accurate.

关键词： phenomenological theory habit-plane volume fraction mirror symmetric operation.

CRACK BEHAVIOR OF SHEAR-FAILURE-TYPE RC T-BEAMS UNDER UNIFORM LOADS

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CRACK BEHAVIOR OF SHEAR-FAILURE-TYPE RC T-BEAMS UNDER UNIFOR...

THE LIMITATION OF MATANSITIC INVARIANT HABIT PLANE AND MARTENSITE MORPHOLOGY

The International Symposium on Innovation & Sustainability of Structures in Civil Engineering

作者： Xian Rong Pinfeng Tan Tiecheng Wang Department of Programming and Construction Hebei University of Technology tianjin 300132 China College of Civil Engineering tianjin University tianjin 300172 China

＜正＞A study on the proper prediction of crack width in high-strength reinforced concrete beams under uniform loads is presented here. This work is based on experimental results obtained on eight reinforced concrete T-beams under equivalent uniform distributed load. The main parameters varied in the test were: concrete strength and stirrup ratio. A three-dimensional nonlinear finite element analysis is either conducted using ANSYS 5. 7 and a comparison of results from both tests and numerical analysis on all eight specimens shows very good coherence in prediction of the development of cracks in T-beams.

关键词： Reinforced concrete T-beam high-strength stirrup equivalent uniform distributed load crack capability crack propagation finite element analysis

来源： cnki会议评论

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Acta Metallurgica Sinica(English Letters) 1996年第4期9卷 298-306页

作者： N.J. Gu, H.F. Peng, X. Y Song, F.X. Yin and E.X. Wang(Department of Material Science and Engineering Hebei University of Technology, tianjin 300132, China

The strain tensor and displacement vector associated with lattice deformation were introduced to discuss the effect of self-accommodation and plastic accommodation in martensitic transformation,and the models for {557}_f and {3,10,15}_f martensite fomation were proposed, along with the experimental verification. It is considered that the invariant habit plane may result from the self-accommodation between different martensitic variants causing the internal twin structure. However, as the strength of parent phase is low enough for the plastic accommodation to occur the dislocation substructure in martensite be produced, in which case the invariant habit plane is difficult to form so the{225}_f and {557}_f habit planes are difficult to explain by the phenomenological crystallographic theory. So,there are some limitations for the martensitic invariant habit *** the present work the authors also suggest that the martensite morphology depends on the competition between self-accommodation and plastic accommodation including factors not only of strength but also of structure of the parent phase However, when the density of crystal defects is high dislocations rather than twinned martensite will form in spite of the higher strength of the parent phase.

关键词： rystallography,martensitic transformation martensite morPhology

Safe Environmental Research on Urban Road

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Safe Environmental Research on Urban Road