共查询到18条相似文献,搜索用时 31 毫秒
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管道化加热器矿浆管,由于工作在高温、高压、高碱的恶劣环境,材质的破坏成长为期制约管道化生产的瓶颈。本文通过对几种材料的对比分析,结合生产中使用情况,并参考大量文献及实验数据,提出使用16Mn钢管作为矿浆管材料可能更适宜。 相似文献
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介绍了百万千瓦级蒸汽发生器管板堆焊层缺陷形成的原因,针对某制造厂发生的管板堆焊层的质量问题,采用分析和试验的方法确定该缺陷对后续管子管板封口焊缝质量的影响,并提出了该质量问题的处理方案,为处理和提高管板镍基堆焊层的质量问题提供参考。 相似文献
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P. E. Doherty Ph.D. J. M. Sarver M.Sc. B. P. Miglin Ph.D. 《JOM Journal of the Minerals, Metals and Materials Society》1996,48(5):39-41
The integrity of heat-exchanger tubes in a nuclear reaction system is crucial for the safe operation of a power plant. In order to study the corrosion behavior of certain alloys, constant extension rate (CERT) tests were performed on alloy 690 and alloy 800 nuclear steam generator tubing specimens. In this article, the CERT test results (such as maximum stress achieved and crack morphology) are correlated to tubing microstructure, chemistry, and manufacturing processes. 相似文献
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Yu. M. Buravlev V. V. Ivanenko Z. A. Samoilenko E. G. Darovskikh 《Metal Science and Heat Treatment》1978,20(3):237-240
Conclusions As the result of two heat treatments the structural heterogeneity, microhardness gradient in the seam and the base metal, and the residual internal stresses in weldments decreased considerably. The best properties were obtained after heat treatment 1: heating at a rate of 20 deg/h at 1050–1080°, holding 30 min, and furnace cooling to room temperature at a rate of 65 deg/h.Donets Physicotechnical Institute, Academy of Sciences of the Ukrainian SSR. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 60–63, March, 1978. 相似文献
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大厚度LF6铝筒段在自动焊接后容易出现气孔和夹渣等缺陷.针对这些焊接缺陷提出采用手工钨极氩弧焊进行补焊修复的工艺措施.根据排挖缺陷的具体情况,分为未挖穿和挖穿两种方式进行修复.实践证明这种工艺可以有效保证补焊质量,对企业的生产具有重要的实际应用价值. 相似文献
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The excellent steam oxidation resistance of iron aluminide coatings on ferritic steels at 650 °C has been demonstrated both by laboratory tests and field exposure. These coatings are formed by the application of an Al slurry followed by diffusion heat treatment at 700 °C for 10 h. The resulting microstructure is mostly composed of Fe2Al5 on top of a much thinner FeAl layer. This coating exhibits perpendicular cracks due to thermal expansion mismatch between coating and substrate. However, these stress relieving cracks do not seem to have an effect on the mechanical properties of the substrate. Cyclic oxidation, creep resistance and TMF testing of these coatings at 650 °C indicate excellent performance. 相似文献