大型锻件热处理过程的数值模拟研究

在对大型锻件传热分析的基础上,建立了大型锻件的物理模型,对其温度场的变化规律进行了模拟计算,同时将模拟结果和实验结果进行了对比分析,并通过实例说明了热处理过程数值模拟方法的准确性和优越性,为进一步分析此类工件的组织转变和应力应变等奠定了基础.     

大线能量焊接耐火耐候建筑用钢的性能试验及应用研究

对武钢研制的大线能量焊接耐火耐候建筑用钢的力学性能、焊接性能与其典型应用进行了研究。试验结果表明：该钢具有优良的综合力学性能，在600℃温度下的屈服强度均高于其室温下屈服强度的2／3，完全满足建筑结构用钢耐火安全性的强度许用指标；该钢具有低的焊接冷裂纹敏感性，能承受大线能量(50～100kJ／cm)焊接；该钢在大型建筑应用中的实际效果良好。     

Numerical modelling of void inclusions in porous media

Numerical modelling of porous flow in a low‐permeability matrix with high‐permeability inclusions is a challenging task because the large ratio of permeabilities ill‐conditions the finite element system of equations. We propose a coupled model where Darcy flow is used for the porous matrix and potential flow is used for the inclusions. We discuss appropriate interface conditions in detail and show that the head drop in the inclusions can be prescribed in a very simple way. Algorithmic aspects are treated in full detail. Numerical examples show that this coupled approach precludes ill‐conditioning and is more efficient than heterogeneous Darcy flow. Copyright © 2003 John Wiley & Sons, Ltd.     

DTM350-600磨煤机大轴断裂分析

针对陕西渭河发电有限责任公司5号炉磨煤机乙磨大轴断裂失效进行了金属分析。结果表明应加强制造质量监控和实施设备全过程金属监督。     

Microstructure of Nanostructured WC-Co Coating Prepared by Thermal Spraying

Nanostructured WC-Co coatings were produced with Atmospheric Plasma Spraying (APS) and Low Pressure Plasma Spraying (LPPS). Microstructure characteristics and phase compositions of the coatings were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The microstructure compositions were analyzed with EDS. During APS deposition the existence of oxygen causes the decarburization of the coating, and the coating was composed of melted area and the WC/12Co powder. Besides WC phase, there was W2C phase. However in the coating deposited by LPPS the content of oxygen was so low that there were a limit degradation of the WC/12Co powder. The coatings were made up of compact block and loosen porosity area. There were large quantities of nanostructure WC grains and a small quantity of microstructure WC grains presented in the coating. Besides WC phase, a little W2C and WC1-x or Co6W6C phases occured. Consideration of the characteristics of the highly porous, spherical-shell morphology of nano-WC/12Co power, heterogeneous melting and localized superheating of the power were two main factors which caused the microstructure and phase composition of nano-WC-Co coatings.     

High‐luminance 1‐m‐long plasma tubes for wall displays

Abstract— The plasma‐tube array is expected to realize a wall‐sized display. This method will realize an emissive‐type display with a flexible screen shape and an expandable screen size. The shape of the plasma tube was investigated to realize high luminance, high luminance efficacy, and high flexural strength. As the result, a cylindroid tube is proposed to satisfy these demands. An experimental display of 1 m × 128 mm has been developed with these cylindroid tubes and it demonstrated a high luminous efficacy of 3.1 lm/W.     

某星载大口径天线子系统的力学仿真分析

星载天线在发射及在轨阶段将面临严酷的力学环境,要求具有极高的可靠性。为了验证其刚度和强度,缩短研发周期,文中采用NX Nastran软件建立了某星载大口径天线子系统的力学仿真模型;为了验证仿真的有效性,进行了该天线子系统的模态测试,经对比发现两者数据一致性较好;基于建立的有限元模型,分析了该天线子系统在正弦振动和热循环环境工况下的结构响应和受力情况,得到了相应的加速度、位移和应力云图。结果表明,该天线子系统的结构刚强度均满足星载环境要求。该仿真分析对星载天线子系统的结构设计具有重要的指导意义。     

关于Poisson分布高阶矩的几个定理的推论

本文对笔者曾撰文〔1〕推出的 Poisson分布高阶矩的几个定理作进一步的研究 ,给出几个推论。     

第二代电渣冶金技术与重大装备制造

2010年是我国电渣重熔技术工业化50周年.论述了电渣冶金技术的分类,发展历史的"分期",第二代电渣冶金技术特征.超大型电渣重熔锭及第二代液态金属浇注大型电渣锭与核电等重大装备制造业发展的关系.指出:中国在电渣重熔锭大型化发展方面,一直处于世界电渣强国地位.随着我国重大装备制造技术的迅速发展,特别是我国核电工业的迅速发展,大型锭电渣冶金技术将不断完善与发展,反过来它又必将促进我国在核电技术方面迅速赶上国际先进水平.