房间空调器试验台测控软件的开发

为了能在各种环境条件下对房间空调器的性能进行测试,就需要专门的仿真设备.房间空调器试验台就是用于房间空调器的自动化仿真测试设备,可进行空调器的制冷能力、制热能力、一般性能试验、自动除霜试验、环境试验、异常试验等一系列仿真试验.测控软件是本试验台的核心组成部分和灵魂,对空调器的各种试验进行组织、监控和数据处理,是软件技术、制冷技术和测量控制技术的结合.该文介绍了房间空调器试验台的构成,用VB.net来开发房间空调器试验台测控软件,进行试验过程的自动化测量监控,并将测控软件应用到实际工业现场中,满足了空调器制造商对空调器质量检测和研究开发的需要.     

离子注入聚碳酸酯表面力学性能改变研究

将B^ 和O^ 离子分别注人到高分子化合物聚碳酸酯(PC)中，PC的表面显微硬度和耐磨性能均得到了较大提高。用纳米硬度计测量注人前后PC的显微硬度，硬度提高了7～25倍。用球盘式磨损实验机测量注人前后PC的耐磨性能，磨痕的宽度比未注人的窄，最窄的磨痕(或最窄处)为未注人磨痕宽度的1／3～1／2。傅里叶变换红外光谱(FTIR)测试表明，注人前后高分子的结构发生了变化。     

基于Windows平台的全自动水泥强度试验机系统的开发与应用

本文介绍了在Windows环境下对水泥强度试验机系统 程序的开发和应甩,该程序用Visual C 6.0与Access软件编制,具有操作简单、使用方便、精度和效率高等优点。     

维氏硬度试验中测量不确定度的评定

介绍了硬度测量不确定度的原理和方法。利用无偏差估计方法和考虑硬度计偏差的方法对维氏硬度试验中的测量不确定度进行了评定。并对两种方法评定的不确定度结果做了比较。     

烧结马氏体不锈钢的热处理

本文对烧结 4 10马氏体不锈钢的淬、回火行为进行了研究 ,分析了热处理工艺参数对该种烧结马氏体不锈钢硬度的影响 ,为优化烧结 4 10马氏体不锈钢的热处理工艺提供了技术参考     

1Cr12Ni3Mo2VN退火工艺研究

通过1Cr12Ni3Mo2VN（KT5312AS6）钢不同的退火工艺、退火温度及时间、二次退火及退火冷却方式对硬度的影响实验研究,得出本钢种最佳退火工艺。经实验证明,采用不完全退火及二次退火方式,能够满足标准对交货硬度的要求。     

Analysis of Laser Surface Hardened Layers of Automobile Engine Cylinder Liner

 The effects of rare earth (RE) on the microstructures and properties of high carbon high speed steel (HCHSS) were investigated. The results show that when suitable RE is added to the HCHSS, the effect of RE on the austenite and eutectic carbides is obvious. The austenite grain and coarse eutectic structure are refined, and flake carbides in the eutectic structures become short and fine. After heat treatment, most of the eutectic carbides are spheroidized and distributed in a uniform manner. The hardness and red hardness of modified HCHSS are slightly increased; impact toughness is greatly increased by 3781% and reaches 1017 J/cm2. The mechanism by which RE improves the structures and properties of HCHSS is also analyzed.     

Structural heterogeneity and its effects on the properties of an in situ TiB2–TiC/Cu composite synthesised by hot pressing

ABSTRACT

In situ TiB₂ and TiC reinforced copper matrix composites with tailored heterogeneous structure were fabricated via high-energy ball milling of Cu, TiH₂ and B₄C powders followed by hot pressing. The microstructures of both ball-milled powders and hot-pressed composites were compared. Although the dislocation density of Cu matrix was changed after hot pressing, the mode of distribution of ceramic phases in the Cu matrix was noted to transmit from the ball-milled powders to hot-pressed composites in case of the TiH₂ particles synthesised by the in situ reactions. The structural inheritance between the ball-milled powders and hot-pressed composites could be used to control microstructural features and thus to tune properties. The hot-pressed TiB₂–TiC/Cu composites with tailored heterogeneous structure exhibited better performance than those of homogeneous counterparts.     

Cu-9.5Ni-2.3Sn-0.2Si合金铸态组织与时效性能的研究

应用金相显微镜、能谱仪、X-射线衍射仪、SIGMASCOPE SMP10型导电仪、维氏硬度计等仪器,分析了添加0.2％(质量分数)Si对C72500合金的铸态微观组织、时效后的微观组织、电导率和硬度的影响.结果表明:向C72500合金中添加0.2％Si后,合金铸态组织呈明显的树枝晶状,且枝晶发达,组织中出现了Ni2Si、NiSn、Ni3Sn相,经400℃×4h时效后,由于Ni2Si、Ni3Si相的析出,通过阻碍晶粒长大和时效沉淀而强化.合金的电导率随时效时间的延长或时效温度的提高一直增大,随后增加减缓,而合金的硬度与时效时间、时效温度曲线是单峰曲线,并随时效时间的延长或时效温度的提高先增大后减小,合金时效制度以400℃×6h为宜.     

Effect of Heat Treatment on Microstructure and Mechanical Properties of HB400 Grade High Strength Abrasion Resistant Steel

High strength abrasion resistant steel plates are widely used in mining,construction and agricultural machineries.The plates are,however,usually poor in impact toughness.An attempt is made to improve the impact toughness of HB400 grade abrasion resistant steel by controlling quenching and tempering of the plates.Optimized combination of the strength and the toughness has been achieved by choosing best fit set of quenching and tempering condition.Mechanism underlying the achievement has been investigated in terms of the microstructure consisting of tempered lath martensite,retained austenite and precipitated carbides.