M963镍基高温合金疲劳性能的神经网络预测

基于神经网络技术,根据M963铸造镍基高温合金疲劳试验数据,建立了高温合金疲劳性能预测模型,并进行了M963铸造镍基高温合金相关疲劳验证和分析。结果表明:从提高M963高温合金疲劳性能的角度出发,合金元素添加量(质量分数)优选为7%Cr+5%V+0.5%RE;熔体过热温度优选为1 030℃;表面超音速火焰喷涂合金粉末配比优选为Cr-20Al-30V-0.5Y。     

快速凝固Ni_3Al在结构强化和研制新型高温合金中的应用

本文设计了一种用Ni_3Al做为强化相的镍基高温合金和一种以Ni_3Al为基体的Ni-Al合金,分析、比较了常规铸态凝固和快速凝固后各合金的微观组织结构。实验结果表明,应用快速凝固技术不仅可以明显改善合金的微观组织结构,增加镍基高温合金中弥散强化的Ni_3Al相的数量,还有可能通过控制Ni_3Al的尺寸、形态和亚稳相的形成研制出性能更好的、以Ni_3Al为基体的新型高温合金。     

铬对镍基合金抗高温氧化性能的影响

借助扫描电镜、电子探针和Ｘ射线衍射仪，研究了铬对镍基合金抗高温氧化性能的影响。结果表明，随着合金γ－相中铬浓度的增加，合金氧化增量降低，氧化膜结晶细化，提高了合金抗高温氧化性。     

挤压铸造对ZA27合金力学性能的影响研究

研究了挤压铸造对ＺＡ２７合金室温和高温力学性能的影响，结果表明，挤压铸造改善了ＺＡ２７合金的综合性能，特别是其强度指标提高时，塑性、韧性指标也同时提高，从而扩大了该合金的应用范围     

镍的铝化物—未来的新型超级合金

<正> 镍的铝化物(Ni_3~-Al及其含Cr衍生物)是一类具有独特的高温性能和腐蚀抗力的新合金,它是成分为Ni_3~-Al的有序金属间化合物,加入少量的硼可增加韧性,加入少量的锆和铪可增加强度。由于含铝量较高,这类合金的比重比大部分商用镍基超级合金低10～20％。这类合金成分简单,显微组织为单相;当温度不超过800℃(1472°F)时,     

Be-Al合金的机械性能

本文鉴定了62Be-38Al锻造合金和65Be-32Al-3Ni铸造合金的机械性能。在室温和高温条件下测定了其抗拉伸强度和延伸率，在室温下确定了其断裂韧性。其抗疲劳性依据室温下应力耐久性(S-N)与裂纹扩展应力速率强度范围(da／dN-△K)的关系来定性。并研究了以上所提到性能的试验结果的微观结构和裂纹路径。研究表明：该锻造合金与铸造合金的显微组织是由铍相颗粒分散在一铝相基体的组织所组成。在锻造合金中铍相颗粒在其压延方向上线性排列，而在铸造合金中，铍相颗粒粗糙且环绕铝相基体，并无方向排列。总之，锻造合金比铸造合金有更好的机械性能，包括抗疲劳性等。在室温下，锻造合金在L-T方向和T-L方向上的条件平面应变断裂韧性分别为38．8MPa√m和22．4MPa√m。锻造合金在各种温度下，而铸造合金在高温下，进行抗拉强度试验，抗疲劳性试验和断裂韧性试验时，其裂纹路径倾向于沿着铝相和铝／铍相交界面区域。而在室温下对铸造合金进行抗拉强度试验，其裂纹穿过铍相和铝相。     

铁对K418合金组织性能的影响

着重研究了铁的质量分数从0.85%变化到3.32%时对K418镍基高温合金的组织及性能的影响。研究表明,铁含量的变化,没有改变K418合金中主要相的组成,且铁含量对高温拉伸强度的影响较小。当铁的质量分数超过1%后,使材料的延伸率发生了波动,但波动幅度较小,并且这也可能是因为熔炼过程不均匀造成的。     

Be-Al合金的机械性能

本文鉴定了62Be-38Al锻造合金和65Be-32Al-3Ni铸造合金的机械性能，在室温和高温条件下测定了其抗拉伸强度和延伸率，在室温下确定了其断裂韧性，其抗疲劳性依据室温下应力耐久性（S-N）与裂纹扩展应力速率强度范围（da/dN-△K）的关系来定性。并研究了以上所得到性能的试验结果的微观结构和裂纹路径。研究表明：该锻造合金与铸造合金的显微是由铍相颗粒分散在一铝相基体的组织所组成，在锻造合金中铍相颗粒在其压延方向上线性排列，而在铸造合金中，铍相颗粒粗颗且环绕铝相基体，并无方向排列，总之，锻造合金比锻造合金有更好的机械性能，包括抗疲劳性等。在室温下， 锻造合金有更好的机械性能，包括抗疲劳性等，在室温下，锻造合金在L-T方向和T-L方向上的条件平面应变断裂韧性分别为38.8MPa√-m和22.4MPa√-m。锻造合金在各种温度下，而锻造合金在高温下，进行抗拉强度试验，抗疲劳性试验和断裂韧性试验时，其裂纹路径倾向于沿着铝相和铝/铍相交界面区域。而在室温下对铸造合金进行抗拉强度试验，其裂纹穿过铍相和铝相。     

铸态镍铝青铜的微观组织

本文研究了铸态镍铝青铜的微观组织。当铝含量为9.2％,镍含量低于2％时,合金铸态组织由先共析α固溶体,α+γ_2共析组织和残余β相(马氏体)组成。若将镍含量增至3％以上,铸态组织中的α+γ_2被α+β_2′;共析组织取代,且不再有马氏体存在。如果维持合金中镍含量在3％左右,将铝含量增加0.5％,合金中出现α+β_2′+γ_2共析组织。各种共析组织的形貌虽十分相似,但可以用SEM和TEM的方法鉴别。     

以金属间化合物为基的快速凝固新型高温合金

本文简要回顾了新型高温结构材料的发展概况,阐述了金属间化合物的主要性能,说明了应用合金化方法和快速凝固技术改善金属间化合物的性能、研制新型高温合金的基本原理,具体介绍了几种以金属间化合物为基的快速凝固高温合金的研究成果。     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

Overview of Anti-tank Mines

First the different anti-tank mines laying possibilities are shortly summarized： hand emplaced, with mine layers, ground or helicopter relatively topographical well defined, and with cluster systems of projectiles, rockets and aircraft dispensers. Then examples of the three generations of anti-tank mines are presented：Ⅰ generation： detonating only beneath the track; Ⅱ generation： detonating beneath the track and belly; Ⅲ generation： mines with off-route actions. Weight and cost comparisons are strongly favoring the off-route Ⅲ-generation mines.     

A Finite Element Analysis on Static Strength of a Complex Section

A static finite element analysis （FEA） of an impulsive controller section is presented. The boundary condition and a part of the loads are applied. Considering the grades of the stress around the holes being large, the dense grids are adjusted accordingly. Four cases with different loads are compared, thus the influences of different loads on the section are analyzed. Numerical results show that the maximum stress of the section is lower than the strength limit of the material, and the section will not be broken with the static loads.     

Discussion on Mechanism of Breech-Blow Caused by Propellant Charge

From the view point of launch safety caused by fracture of propellant charge, this paper points out that the safety criterion of pressure wave is inadequate to evaluate the launch safety of propellant charge based on the initial negative differential pressure and sensitivity tests. Generally, the maximum barrel pressure does not depend upon the intensity of pressure wave correspondingly. The pressure wave intensity can not describe the fracture degree of propellant charge in chamber and reflect the mechanical environment of propellant charge fracturing exactly and wholly. The evaluation criterion for launch safety of propellant charge should be built on the basis of depicting the fracture degree of propellant bed.     

Experimental Studies of Toxicity on HNIW and Its Intermediates

The polycyclic nitramine hexanitrohexaazaisowurtane（HNIW） is a compound of high energy density. HNIW can replace 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane（RDX） or HMX, hut its toxicity is unknown. In this paper, HNIW, hexabenzylhexaazaisowurtzitane （HBIW）, tetraacetyldibenzulhexaazaisowurtzitane （TADBIW）, tetraacetyldiformylhexaazaisowurtzitane（TADFIW） and tetraacetylhexaazaisowurtzitane（TAIW）, which are intermediates of the synthesis of the HNIW, were selected as the tested objects in acute toxicity test, acute eye stimulation test and skin irritation test according to the standards of ＂chemical product testing method-401 ： acute oral toxicity test＂, ＂chemical product testing means-405： acute eye irritation/corrosion test＂ and ＂chemical product testing means-404： acute dermal irritation/corrosion test＂ of National Circumstance Protect Bureau. The results show that all of the five objects have no toxicity, no stimulation to eye and skin under the tested conditions.     

Dynamic Simulation for Missile Erection System

In order to study the dynamic characteristics of the missile erection system, it can be considered as a rigid-flexible coupling multi-body system. Firstly, the actual system is abstracted as an equal and simplified one and then the forces applied to it are analyzed. Secondly, the rigid-flexible coupling dynamic simulation for erection system is accomplished by use of the system simulation software, for example Pro/E, ADAMS, ANSYS, MATLAB/Simulink, etc. Finally, having the aid of simulation results, the kinetic and dynamic characteristics of the flexible bodies in erection system are analyzed.The simulation considering the erection system as a rigid-flexible coupling system can provide valuable results to the research of its kinetic, dynamic and vibrational characteristics.