| 300M钢在门坎值附近疲劳裂纹扩展行为的研究 |
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| 引用本文： | 丁传富.300M钢在门坎值附近疲劳裂纹扩展行为的研究[J].航空学报,1992,13(8):456-460. |
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| 作者姓名： | 丁传富 |
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| 作者单位： | 北京航空材料研究所25室 北京 |
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| 摘 要： | 在实验室空气环境中研究了300M钢等温和油淬状态,五种载荷比下裂纹扩展速率为10~(-7)～10(-3)mm/Cycle的疲劳裂纹扩展行为。着重分析了载荷比和显微结构对门坎值附近裂纹扩展行为的影响。基于在门坎值附近断口表面上所观察到的氧化喾物和沿晶断裂机制,用裂纹闭合和环境效应合理地解释了300M钢在门坎值附近的裂纹扩展特性。
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| 关 键 词： | 门坎值 裂纹扩展速率 应力比 显微结构 |
INVESTIGATION OF NEAR-THRESHOLD FATIGUE CRACK PROPAGATION BEHAVIOUR IN 300M ULTRA-HIGH STRENGTH STEEL |
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| Ding Chuan-fu.INVESTIGATION OF NEAR-THRESHOLD FATIGUE CRACK PROPAGATION BEHAVIOUR IN 300M ULTRA-HIGH STRENGTH STEEL[J].Acta Aeronautica et Astronautica Sinica,1992,13(8):456-460. |
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| Authors: | Ding Chuan-fu |
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| Institution: | Beijing Institute of Aeronautical Materials, Beijing, 100095 |
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| Abstract: | In this paper fatigue crack propagation behaviour of 300M ultra-high strength steel has been investigated in laboratorial air over a very wide range of growth rates from 10-7 to 10-3 mm/cycle at the various load ratios R( = 0.05, 0.1, 0.3, 0.5, 0.7) and the two states of heat treatment (quench and isothermal). Particula emphasis has been devoted to the influence of load ratio and microstructure on behaviour of near-threshold fatigue crack growth. According to oxide deposits and intergranular fracture observed on near-threshold fatigue fractures behaviour of near-threshold crack growth in 300M has been explained rationally in terms of the crack closure and environmental effect. |
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| Keywords: | threshold value fatigue crack growth rate load ratio microstructure |
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