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Tensile and very high cycle fatigue behaviors of a compressor blade titanium alloy at room and high temperatures

机译:在室温和高温下压缩机叶片钛合金的拉伸和非常高的循环疲劳行为

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摘要

Tensile and fatigue behaviors of a compressor blade titanium alloy TC17 at room and high temperatures (RT and HT) have been investigated up to very high cycle fatigue (VHCF) regime. Compared to RT, the HT tensile strength of TC17 titanium alloy decreases, but the elongation remains basically unchanged at HT. The fatigue S-N curves are changed from single linear mode at RT to bilinear mode at HT owing to the temperature effect, and the failure mode is transformed from the surface and subsurface crack initiations at RT to the surface crack initiation at HT. The brittle oxygen-enriched subsurface (BOES) layer on the specimen surface is responsible for the crack initiation at HT. The failure models of oxide shedding and oxide intrusion are proposed. Dislocation distribution indicates that the fatigue failure at HT is insensitive to the intrinsic material microstructure and is only related to the BOES layer on the specimen surface in the VHCF regime.
机译:在室内和高温(RT和HT)的压缩机叶片钛合金TC17的拉伸和疲劳行为已经研究了非常高的循环疲劳(VHCF)制度。与RT相比,TC17钛合金的HT拉伸强度降低,但在HT中基本保持伸长率仍然保持不变。由于温度效应,在HT处以在室温下的单线性模式下从单线性模式改变疲劳S-N曲线,并且由于温度效应,故障模式在室温下从表面和地下裂纹引发转变为HT的表面裂纹启动。样品表面上的脆性氧的地下(Boes)层对HT的裂纹引发负责。提出了氧化脱落和氧化物侵入的故障模型。位错分布表明HT的疲劳失效对本征材料微观结构不敏感,并且仅与VHCF制度中的样本表面上的孔层有关。

著录项

  • 来源
    《Materials Science and Engineering》 |2021年第15期|141049.1-141049.12|共12页
  • 作者单位

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China School of Architecture and Civil Engineering Chengdu University Chengdu 610106 China;

    Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan University Chengdu 610207 China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China;

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

    Titanium alloy; High temperature; Very high cycle fatigue; Crack initiation mechanism; Oxide layer;

    机译:钛合金;高温;非常高的循环疲劳;裂纹启动机制;氧化物层;

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