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WEI Yueguang ZHU Chen & WU Xiaolei LNM Institute of Mechanics Chinese Academy of Sciences Beijing China Correspondence should be addressed to Wei Yueguang 《中国科学G辑(英文版)》2004,47(1):86-100
Recentresearchesshowthatthehighstrengthnano-structuredmaterialscanbefabricatedbyusingsomeadvancedtechniques,andthemechanicalbehavioroftheconventionalmaterialscanbeimprovedbyusingasurface-nanocrystallinetechnique.Forexample,byusingthesevereplasticdeformation(SPD)method,onecanfabricatethenanocrystallinematerials[15].TheadoptedSPDmethodsmainlyincludethelargetorsionmethod[1],thelargepressingmethod[4]andtheultrasonicshotpeening(USP)method[5],etc.Theconstructionfeaturesofboththenano-structuredbl… 相似文献
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SHANYAVSKIY A A 《中国科学:物理学 力学 天文学(英文版)》2014,57(1):19-29
In-service Very-High-Cycle-Fatigue(VHCF)regime of compressor vane and turbine rotor blades of the Al-based alloy VD-17and superalloy GS6K,respectively,was considered.Surface crack origination occurred at the lifetime more than 1500 hours for vanes and after 550 hours for turbine blades.Performed fractographic investigations have shown that subsurface crack origination in vanes took place inspite of corrosion pittings on the blade surface.This material behavior reflected lifetime limit that was reached by the criterion VHCF.In superalloy GS6K subsurface fatigue cracking took place with the appearance of flat facet.This phenomenon was discussed and compared with specimens cracking of the same superalloy but prepared by the powder technology.In turbine blades VHCF regime appeared because of resonance of blades under the influenced gas stream.Both cases of compressor-vanes and turbine blades in-service cracking were discussed with crack growth period and stress equivalent estimations.Recommendations to continue aircrafts airworthiness were made for in-service blades. 相似文献
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本文采用表面裂纹法,利用自行研制的低温多试样拉伸装置,研究了一种航天铝合金材料的焊缝在低温下(20K)的断裂性能,并对断口进行了电镜显微分析,为提高质量的焊接提供了依据。 相似文献
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