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铸造高速钢轧辊的成分设计与热处理

铸造高速钢轧辊的成分设计与热处理

作者：蔡影祥辽宁工程技术大学

学位级别：硕士

本文设计了9种成分的高速钢轧辊，对每种成分的轧辊分别采用了4种热处理工艺，根据(Fe—5Cr—5Mo—5W—2C)—V和(Fe—5Cr—5Mo—5W—3-4V)—C准二元相图以及(Fe—5Cr—5W—5Mo)—V—C合金系液面投影图确定轧辊的凝固过程。利用扫描电镜... 详细信息

本文设计了9种成分的高速钢轧辊，对每种成分的轧辊分别采用了4种热处理工艺，根据(Fe—5Cr—5Mo—5W—2C)—V和(Fe—5Cr—5Mo—5W—3-4V)—C准二元相图以及(Fe—5Cr—5W—5Mo)—V—C合金系液面投影图确定轧辊的凝固过程。利用扫描电镜、X射线和能谱分析详细研究了9种热轧用高速钢轧辊的相组成和显微结构，分析了成分变化和热处理工艺对显微结构和力学性能的影响，确定了合理的热处理工艺和成分配比。

关键词：轧辊高速钢热处理显微结构

Synthesizing Metastable Rocksalt-Type MgTe Based on High-Pressure Solid-State Phase Transition： A First-Principles Study

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Chinese Physics Letters 2009年第11期26卷 45-48页

作者：蔡影祥徐瑞 Department of Physics Nanchang University Nanchang 330031 State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004

The controllability;of pressure-induced structural transformation in the hexagonal wurtzite-type MgTe is studied by a first-principles pseudopotential method within the generalized gradient approximation （GGA）. Based on the transitional mechanisms of the wurtzite→NiAs and the wurtzite→rocksalt, a special method of loading biaxial pressure on the （010） and （001） planes of an orthorhombic cell is designed. At equal biaxial pressure of 2. 75 GPa, an abrupt volume collapse is found and the WZ phase transforms into an orthorhombic phase with a tiny distortion. While the pressure decreases to zero, three lattice parameters a, b and c become equal and a metastable rocksalt-type MgTe is obtained.

关键词： Condensed matter: structural mechanical & thermal

First-Principles Study of the γ Angle Deformation Path in the Wurtzite-to-Rocksalt Phase Transition in Aluminum Nitride

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Chinese Physics Letters 2010年第9期27卷 175-178页

作者：蔡影祥徐瑞 Department of Physics Nanchang University Nanehang 330031 State Key Laboratory of Metastable Mater-ials Science and Technolo-gy Yanshan University Qinhuangdao 066004

A new transition path （γ angle deformation path） is put forward and used to characterize the wurtzite-rocksalt transition in AlN. The enthalpy surface and the contour plot of enthalpy difference at equilibrium pressure are obtained by first-principles pseudopotential method within the generalized gradient approximation. The phase transition is needed to overcome two barriers and a metaphase arises between them. The total barrier height is 0.26eV. The pressure region of the phase transition is estimated to be 13.9-23.5 GPa, in which the experimental result is well located. Along the least barrier path, the changes of density of states and the fields of charge density difference are investigated. The similarities and differences between γ angle deformation path and the orthorhombic deformation path are analyzed.

关键词： Angling Pressure Fields Density

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ITER真空室中子屏蔽设计

核聚变与等离子体物理 2005年第2期25卷 99-104页

作者：刘常乐武松涛郁杰蔡影祥中国科学院等离子体物理研究所合肥230031

ITER真空室中子屏蔽主要是屏蔽中子流、伽马射线以及降低环向场波纹度。介绍了ITER真空室的结构特点及屏蔽结构料材的选取情况,发展了屏蔽设计思想及相关的支撑结构,对铁磁性材料填充区域进行了布局设计。依据ITER真空室物理学计算结果... 详细信息

ITER真空室中子屏蔽主要是屏蔽中子流、伽马射线以及降低环向场波纹度。介绍了ITER真空室的结构特点及屏蔽结构料材的选取情况,发展了屏蔽设计思想及相关的支撑结构,对铁磁性材料填充区域进行了布局设计。依据ITER真空室物理学计算结果,确定了屏蔽区域屏蔽材料的填充率。基于三维建模软件进行了屏蔽块零件库的仿真设计和屏蔽结构的模拟仿真。

关键词： ITER 真空室屏蔽设计三维建模软件屏蔽结构中子屏蔽伽马射线结构特点支撑结构设计思想布局设计材料填充计算结果屏蔽材料模拟仿真仿真设计中子流波纹度环向场铁磁性物理学填充率零件库

Structural Analysis of the ITER VV Lower Port Region

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Plasma Science and Technology 2007年第4期9卷 492-495页

作者：蔡影祥武松涛郁杰 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Department of PhysicsNanchang UniversityNanchang 330031China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

A structural analysis of the International Thermonuclear Experimental Reactor （ITER） vacuum vessel＇s lower port region was presented by means of a finite element analysis method. The purpose is to evaluate the stress and displacement level on this structure under various combinations of five designed loads, including the gravity of the vacuum vessel, seismic loads, electromagnetic loads, and possible pressure loads to ensure structural safety. The cyclic symmetry finite element model of this structure was developed by using ANSYS code. The re- sults showed that the maximum stress does not exceed the allowable value for any of the load combinations according to ASME code and the nine vacuum vessel （VV） supports have the ability to sustain the entire VV and in vessel-components and withstand load combinations under both normal as well as off-normal operation conditions. Stress mainly concentrates on the connecting region of the VV support and lower port stub extension.

关键词： ITER vacuum vessel finite element analysis

The Effect of Hydrostatic Pressure and Seismic Load on ITER Lower Cryopump Ports

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Plasma Science and Technology 2007年第2期9卷 216-218页

作者：蔡影祥郁杰武松涛 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Department of PhysicsNanchang UniversityNanchang 330029China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

The lower cryopump ports in International Thermonuclear Experimental Reactor （ITER） as a part of the vacuum vessel play many important roles. As the boundary of vacuum it must be ensured against structural damage. In this study a finite element model of the lower cryopump ports was developed by ANSYS code with a purpose to evaluate the stress and displacement level on it. Two kinds of loads were taken into account. One was the hydrostatic pressure including the normal operation pressure and test pressure. The other was the seismic load. The analysis results show that the peak stress does not exceed the allowable stress for either the hydrostatic pressure or the seismic load according to the ITER structural design criterion, which indicates that the structure has a good safety margin.

关键词： ITER finite element analysis cryopump port

Preliminary Design and Analysis of ITER In-Wall Shielding

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Plasma Science and Technology 2007年第1期9卷 94-100页

作者：刘常乐郁杰武松涛蔡影祥潘皖江 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

ITER in-wall shielding （IIS） is situated between the doubled shells of the ITER Vacuum Vessel （IVV）. Its main functions are applied in shielding neutron, gamma-ray and toroidal field ripple reduction. The structure of IIS has been modelled according to the IVV design criteria which has been updated by the ITER team （IT）. Static analysis and thermal expansion analysis were performed for the structure. Thermal-hydraulic analysis verified the heat removal capability and resulting temperature, pressure, and velocity changes in the coolant flow. Consequently, our design work is possibly suitable as a reference for IT＇s updated or final design in its next step.

关键词： ITER VV in-wall shielding shielding blocks (SB) finite element (FE) structure analysis thermal/hydraulic analysis

Structural Analysis of ITER Lower In-Vessel-Viewing Port

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Plasma Science and Technology 2006年第6期8卷 736-740页

作者：蔡影祥武松涛郁杰刘常乐 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

A finite element model of the International Thermonuclear Experimental Reactor （ITER） in-vessel viewing port was developed by the ANSYS code in order to evaluate the stress level of this structure. The thermal, elastic and modal analyses were made in succession based on the loads designated by the ITER International team. The designed loads include electromagnetic loads, seismic loads, pressure, temperature and gravity. The preliminary results of the finite element analysis （FEA） show that the stress intensity exceeded the allowable stress and the maximum stress was concentrated in the geometric discontinuous region of the shroud stub extension （SSE）. Therefore, the SSE has been modified recently. For the modified structure, we found that the stresses do not exceed the allowable value for all load combinations. In addition the modal analysis results show that the natural frequencies of the IVV port structure are located in the typical diapason of seismic excitation.

关键词： ITER lower IVV port finite element analysis

Superhard BC_2N:an Orthogonal Crystal Obtained by Transversely Compressing(3,0)-CNTs and(3,0)-BNNTs

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Chinese Physics Letters 2016年第10期33卷 94-98页

作者：胡玉洁徐胜亮王昊刘恒徐雪春蔡影祥 Department of Physics Nanchang University

By means of density functional theory calculations, an orthogonal boron-carbon-nitrogen compound called （3,0）- BC2N is predicted, which can be obtained by transversely compressing （3,03 carbon nanotubes （CNTs） and boron nitride nanotubes （BNNTs）. Its structural stability, elastic properties, mechanical properties and electronic structure are systematically investigated. The results show that （3,0）-BU2N is a superhard material with a direct bandgap. However, its similar structures, （3,0）-C and （3,0）-BN are indirect semiconductors. Strikingly, （3,0）-C is harder than diamond. We also simulate the x-ray diffraction of （3,0）-BC2N to support future experimental investigations. In addition, our study shows that the transition from （3,03 CNTS and BNNTs to （3,0）-BC2N is irreversible.

关键词： CNTs and is of BC BNNTs Superhard BC2N:an Orthogonal Crystal Obtained by Transversely Compressing by