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The deformation behavior of dispersion strengthened copper alloy Cu-Al2O3 was studied by TEM. The results show that nano-scaled dispersed second phase not only increases dislocation density in matrix, but also has an important influence on the dislocation substructure. The presence of fine dispersed Al2 O3 particles results in a uniform and random dislocation distribution in matrix copper and causes the difficulty in formation of dislocation cell structure and the decrease in the amount of cell structure during deformation. Deformation gives rise to much more dislocations and dislocation cells form more difficultly and the decrease in the cell size with the increase of dispersion degree. 相似文献
3.
Juan D. Manrique Mohamed Al-Hussein Avi Telyas Geoff Funston 《Canadian Metallurgical Quarterly》2007,133(3):208-216
This paper focuses on the procedure utilized in the construction of tilt-up irregular concrete panels that are constructed on-site using concrete slabs and wooden formwork. The case study required high-quality concrete finishing. The erection and installation procedure called for a maximum panel-to-panel joint tolerance of 1.27?cm (0.5?in.), often 90° joints between panels. To meet precision requirements, the casting slabs were leveled and flattened with laser screed technology and smoothed with chemical solutions. To ensure that the final result met expectations, a mock-up model was built using different types of materials and to simulate site constraints. The architectural design is a composition of precast concrete panels like “Lego” pieces assembled similarly to a jigsaw puzzle. The unique construction process required a state-of-the-art analysis to produce the set quality. Quality conditions as set by the owner included creating a smooth concrete surface on all panels while avoiding damages and reducing equipment and material costs. The proposed methodology is described through its implementation on the case study, which is also described in this paper. 相似文献
4.
RelationshipoftheYttriumCompoundswiththe AlloyingMethodinODSFerriticStainlessSteelZhangYong(张勇);ChenMingbiao(陈明彪);WuChengJian... 相似文献
5.
七煤集团建设工程公司在施工辽阳铧子石膏矿主、风井井筒时 ,多次采用泄压注浆法成功通过中小型含水层 ,对小型突水进行了有效封堵 ,取得了较好的经济效益 相似文献
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MGH956合金是采用机械合金化方法制造的氧化物弥散强化高温合金,具有高温力学性能好、高温抗氧化和抗腐蚀性能好的综合优势。自行研制了中间层合金KCol进行MGH956合金过渡液相(TLP)扩散连接试验,分析了接头组织、成分和连接工艺的关系,确定了MGH956合金TLP扩散连接机理。同时,对MGH956合金焊接接头中产生的夹渣缺陷进行了深入的分析。结果表明:在连接温度1240℃、保温8h条件下,可以获得焊接缺陷少、完整连续的焊接接头。 相似文献
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分析了在大接触应力的磨损条件下,表面残余应力和硬度对40Cr电火花强化层耐磨性的影响,探讨了其磨损机理。结果表明:滚动磨损和滚、滑动磨损时,随着试样表层硬度的提高,试样的耐磨性增大;强化层中的残余压应力可以提高强化层的硬度并增强其耐磨性。滚动磨损时,电火花强化层的磨损方式主要为粘着磨损、疲劳磨损和磨粒磨损三种机制;在滚、滑动磨损时,除上述三种机制外,还发生了氧化磨损。 相似文献
10.
In the thin slab continuous casting (TSCC) of steel, the issue of optimum fluid flow is very important due to higher casting speeds and has direct influence on the formation of solidified shells and the quality of final products. In the current work, a full-scale physical mod-eling of a thin slab caster on the basis of dimensionless Reynolds and Froude similarity criteria was constructed. The flow pattern in the fun-nel shaped mold with a new tetra-furcated submerged entry nozzle (SEN) was investigated. To ... 相似文献