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首页> 外文期刊>Journal of Materials Research >Crack initiation and early growth behavior of TC4 titanium alloy under high cycle fatigue and very high cycle fatigue
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Crack initiation and early growth behavior of TC4 titanium alloy under high cycle fatigue and very high cycle fatigue

机译：TC4钛合金在高周疲劳和极高周疲劳下的裂纹萌生和早期生长行为

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摘要

The crack initiation and early growth behaviors of a TC4 titanium alloy under high cycle fatigue and very high cycle fatigue were experimentally investigated. The results show that it exhibits the duplex S-N curve characteristics associated with surface and interior failures at a stress ratio of 0.1, while it represents the similar S-N curve characteristics only related to surface failure at a stress ratio of -1. The interior failure is accompanied with the occurrence of facets, granular bright facets (GBFs), and fisheye. Slip-like patterns are observable on the facets easily formed under positive stress ratio. The interior failure process is characterized as (i) occurrence of slip lines on partial alpha grains under cyclic loading, (ii) initiation and growth of microcracks within some alpha grains, (iii) coalescence of microcracks and formation of GBF, (iv) stable long crack growth within fisheye, (v) unstable crack growth outside fisheye, and (vi) final momentary fracture.
机译：实验研究了TC4钛合金在高周疲劳和极高周疲劳下的裂纹萌生和早期生长行为。结果表明，在应力比为0.1时，它表现出与表面和内部破坏相关的双工S-N曲线特征，而在应力比为-1时，它表现出仅与表面破坏有关的相似S-N曲线特征。内部故障伴随有小面，颗粒状亮面（GBF）和鱼眼的出现。在正应力比下容易形成的小面上可观察到类似滑模的图案。内部破坏过程的特征是（i）在循环载荷下部分α晶粒上出现滑移线；（ii）一些α晶粒内微裂纹的萌生和生长；（iii）微裂纹的聚结和GBF的形成；（iv）稳定的鱼眼内裂纹扩展长；（v）鱼眼外裂纹扩展不稳定；（vi）最终瞬时断裂。

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  • 来源
    《Journal of Materials Research》 |2018年第8期|935-945|共11页
  • 作者

    Li Wei; Gao Ning; Zhao Hongqiao; Xing Xinxin;

  • 作者单位

    Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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