• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Influence of grain size on fatigue crack propagation and acoustic emission features in commercial-purity zirconium
【24h】

Influence of grain size on fatigue crack propagation and acoustic emission features in commercial-purity zirconium

机译：晶粒尺寸对商业纯锆疲劳裂纹扩展和声发射特性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The influence of grain size on fatigue and corresponding acoustic emission (AE) features in commercial-purity zirconium were investigated. Fatigue crack propagation tests were conducted at room temperature with AE monitored simultaneously. The fatigue properties and AE sources were discussed combined with the microstructural and fractographic observations. The results showed that the increased grain size affected the fatigue crack stable propagation rate slightly, but it resulted in a significant increase of the AE counts rate. During the crack stable propagation, for the specimens with small-sized grains and medium-sized grains, the relationships between AE counts rate and fatigue stress intensity factor range were both generally according with the Pairs law, except some local fluctuations due to the regional occurrence of deformation twins. Especially, for the specimen with large grains, higher AE counts rate presented persistently, which were caused by twins appearing continuously at the edge of the crack. These results suggest that as the grain size increased in commercial-purity zirconium, twin became more frequent and made a more important contribution to the fatigue process, and the AE technique was sensitive to the crack propagation and the twin incidents during fatigue crack growth.
机译：研究了晶粒尺寸对商业纯度锆中疲劳和相应声发射（AE）特征的影响。在室温下进行疲劳裂纹扩展测试，同时监测AE。结合显微组织和分形观察，讨论了疲劳性能和声发射源。结果表明，晶粒尺寸的增加对疲劳裂纹稳定扩展速率有轻微影响，但导致AE计数速率显着提高。在裂纹稳定扩展过程中，对于小晶粒和中晶粒的试样，AE计数率与疲劳应力强度因子范围之间的关系均符合成对定律，但由于区域性发生而引起局部波动。变形双胞胎。特别是，对于大晶粒的试样，持续出现较高的AE计数率，这是由裂纹边缘处连续出现的孪晶引起的。这些结果表明，随着商业纯度锆晶粒尺寸的增加，孪晶变得更加频繁，并且对疲劳过程做出了更重要的贡献，并且AE技术对疲劳裂纹扩展过程中的裂纹扩展和孪晶事件敏感。

著录项

  • 来源
    《Materials Science and Engineering》 |2015年第11期|35-42|共8页
  • 作者

    Lifei Li; Zheng Zhang; Gongtian Shen;

  • 作者单位

    Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China, 8th Lab of the School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China;

    China Special Equipment Inspection and Research Institute, Beijing 100013, China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pure zirconium; Fatigue crack propagation; Acoustic emission;

    机译：纯锆疲劳裂纹扩展;声发射;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号