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应用电测盲孔法对风力发电机转子支架退火前后焊接区残余应力进行了测试,得到了风力发电机转子支架焊接区退火前后残余应力的分布和变化规律,验证了风力发电机转子支架热处理工艺的处理效果,为兆瓦级发电机构件焊接、退火等加工工艺的分析评价及其服役期间的质量监控和分析,提供了第一手的实验数据。 相似文献
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针对二滩水电站#2发电机定子一点接地故障,结合二滩水电站#2发电机定子一点接地的处理过程,分析了#2发电机定子一点接地的原因,并简单阐述了#2发电机定子一点接地的处理措施,为发电机定子接地故障处理提供参考。 相似文献
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介绍了发电机转子的阻尼系统,分析了发电机转子阻尼槽内上层阻尼铜条断裂的原因,提出了避免阻尼条断裂的改进措施.经验证,该措施取得了良好的运行效果. 相似文献
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以建筑室内发电机为研究对象,首先简要分析了建筑室内发电机噪声处理的基本目标,进而研究了建筑室内发电机在运行过程中比较常见的噪声源,在此基础之上,详细阐述了建筑室内发电机噪声处理的主要措施以及安装过程中需要特别注意的几点问题,希望能够为降低建筑室内发电机噪声污染问题提供一定的参考与借鉴。 相似文献
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螺栓头部容易产生断裂。采用硬度试验机、金相显微镜及氢脆试验等手段对失效的螺栓与未失效的螺栓进行对比分析,结果表明该螺栓的失效为氢致断裂。由于热处理的工艺不当,渗碳层过深,导致过多的氢滞留在螺栓基材的内部,在随后的回火过程中氢不易扩散,是导致螺栓氢脆断裂的主要原因。后续的电镀工艺中未及时进行有效的去氢,更加重了氢脆断裂的风险。 相似文献
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西部油田某油井油管发生严重腐蚀甚至穿孔。通过宏观形貌和显微组织观察、化学成分分析、硬度测试、拉伸和冲击性能测试、腐蚀产物检测等方法对油管失效原因进行了分析。结果表明:油管在含Cl^-、H2S、CO2酸性环境下发生了均匀腐蚀和局部腐蚀。均匀腐蚀由H2S-CO2-H2O(Cl^-)体系引起的析氢腐蚀所致;而CaCO3沉积造成的微电偶效应以及Fe^2+与地层水中Cl^-的水合作用导致了油管的局部腐蚀穿孔。建议油井管材采用具有一定抗硫性的P110-3Cr钢或耐蚀性能更优的钢,并添加缓蚀阻垢剂进行防护。 相似文献
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对某航空设备高强度螺栓的断裂原因进行了分析.结果表明:该螺栓在电镀过程中吸入了氢,在应力作用下发生了氢脆断裂.对钢中的氢陷阱及高强钢的除氢处理进行了讨论. 相似文献
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关于氢气气瓶安全性的讨论 总被引:4,自引:0,他引:4
介绍了国际标准ISOlll20对盛装高压氢气钢瓶设计方面的有关规定,包括钢瓶的材料、设计、制造、力学性能试验和超声波检验,并与美国CPI公司在设计制造高压氢气钢瓶方面所使用的安全控制规范进行了对比,对设计及选用常温高压氢气钢瓶时应注意的问题进行了讨论。 相似文献
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介绍了南钢2#20000m3/h空分设备RIK80-4型空压机运行效率下降情况,并详细分析了空压机效率下降的原因.指出空压机导叶波动和中间冷却器翅片氧化腐蚀的原因及处理方法.处理后空压机效率明显提高,节约成本300多万元. 相似文献
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基于氧化沟污水处理工艺流程,应用Labview虚拟平台开发一套氧化沟工艺污水处理过程仿真设备,根据莫洛特方程建立氧化沟模型,采用Labview软件的G语言进行编程。创建包含一个主程序以及4个子程序模块,主程序通过合理的连线将全部输入控件和4个子程序相互连接起来,形成完整的仿真设备,初步实现了对氧化沟污水处理过程中曝气池反应过程的控制。 相似文献
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奥氏体不锈钢三通裂纹分析 总被引:1,自引:0,他引:1
对与脱甲烷塔相连的奥氏体不锈钢管道三通上发现的裂纹性质与成因进行了试验分析。指出管件破裂基本上属氢脆引起的穿晶型解理开裂,即阴极型应力腐蚀破坏。三通冷加工成形后未经高温固溶处理,致使18—8型亚稳定钢中30%以上的奥氏体组织转变成马氏体组织;介质为未经脱硫的甲烷,含较多H2S;较高的加工残余应力、组织应力和应力集中;材料存在缺陷,是导致上述问题的主要原因。改进三通加工成形工艺,及时进行固溶处理,提高奥氏体不锈钢的稳定性,是避免裂纹的关键技术手段。此外,尚需严控介质中Cl^-离子和H2S含量,降低残余应力水平。 相似文献
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Antonio Madroñero De La Cal Juan Aguado-Serrano Maria Luisa Rojas-Cervantes Elena V. Rosa Adame Belen Sarmiento Marron Africa Castro Rosende Roman Nevshupa 《Microscopy research and technique》2009,72(6):447-453
The hydrogen absorption process is studied in carbonaceous fibers produced from a mixture of methane and hydrogen. The absorption of the hydrogen was examined in two types of fibers, in “as-grown” state and after a process of desorption during an annealing to 1.473 K under vacuum. Later to its production process, the fibers withstand an oxidation in air to 973 K. The fibers were examined by means of scanning electron microscopy (SEM) and confocal microscopy by reflection. Differences in the behavior during the oxidation were observed between the fibers in as-grown state and those subjected to a further annealing. It could be verified that the fibers were really constituted by two different phases. In one of the phases, the storage of the hydrogen absorbed took place, whereas in the other phase there was no alteration. The process of annealing prior to the absorption of the hydrogen has an appreciable effect on the desorption rate of the hydrogen. Microsc. Res. Tech., 2009. © 2009 Wiley-Liss, Inc. 相似文献
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Ernando A. Ferreira Aline E. Souza‐Gabriel Yara T. C. Silva‐Sousa Manoel D. Sousa‐Neto Ricardo G. Silva 《Microscopy research and technique》2011,74(3):244-250
Background: It remains unclear as to whether or not dental bleaching affects the bond strength of dentin/resin restoration. Purpose: To evaluated the bond strength of adhesive systems to dentin submitted to bleaching with 38% hydrogen peroxide (HP) activated by LED‐laser and to assess the adhesive/dentin interfaces by means of SEM. Study design: Sixty fragments of dentin (25 mm2) were included and divided into two groups: bleached and unbleached. HP was applied for 20 s and photoactivated for 45 s. Groups were subdivided according to the adhesive systems (n = 10): (1) two‐steps conventional system (Adper Single Bond), (2) two‐steps self‐etching system (Clearfil standard error (SE) Bond), and (3) one‐step self‐etching system (Prompt L‐Pop). The specimens received the Z250 resin and, after 24 h, were submitted to the bond strength test. Additional 30 dentin fragments (n = 5) received the same surface treatments and were prepared for SEM. Data were analyzed by ANOVA and Tukey's test (α = 0.05). Results: There was significant strength reduction in bleached group when compared to unbleached group (P < 0.05). Higher bond strength was observed for Prompt. Single Bond and Clearfil presented the smallest values when used in bleached dentin. SEM analysis of the unbleached specimens revealed long tags and uniform hybrid layer for all adhesives. In bleached dentin, Single Bond provided open tubules and with few tags, Clearfil determined the absence of tags and hybrid layer, and Prompt promoted a regular hybrid layer with some tags. Conclusions: Prompt promoted higher shear bond strength, regardless of the bleaching treatment and allowed the formation of a regular and fine hybrid layer with less deep tags, when compared to Single Bond and Clearfil. Microsc. Res. Tech., 2010. © 2010 Wiley‐Liss, Inc. 相似文献