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首页> 外文期刊>International Journal of Fatigue >Hot dwell-fatigue behaviour of additively manufactured AlSilOMg alloy: Relaxation, cyclic softening and fracture mechanisms
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Hot dwell-fatigue behaviour of additively manufactured AlSilOMg alloy: Relaxation, cyclic softening and fracture mechanisms

机译：含有含有含有肺泡合金的热固疲劳行为：弛豫，循环软化和断裂机制

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摘要

This paper presents the results of high temperature strain-range controlled low cycle fatigue tests of a laser powder bead fused AlSilOMg alloy. Following stress relief (2hrs at 300 °C), two cyclic loading waveforms (standard triangular and dwell-type trapezoidal waveforms) and three temperatures (100 °C, 250 °C and 400 °C) were applied to investigate both the mechanical response and the related microstructural changes of this additively manufactured (AM) aluminium alloy. The bulk mechanical responses were found to exhibit a continuous cyclic softening, decreasing stress relaxation and decreased energy dissipated per cycle. The stress relaxation is strongly affected by the test temperature rising to almost complete relaxation at 400 °C. At lower temperatures (100 °C and 250 °C), the higher the temperature the more subgrains are developed during cyclic loading. Up to 250 °C, the subgrain size increases with temperature and laser powder bead fused defects preferentially act as the fatigue crack initiation sites. While at 400 °C, coarse Si particles precipitate during cyclic deformation and a high density of microvoids are nucleated from these coarse Si precipitates, which grow and link up to cause failure, resulting in a dimple dominated ductile fracture.
机译：本文介绍了激光粉末熔融肺泡合金的高温应变范围控制的低循环疲劳试验结果。在应力缓解（300°C时2小时），施加两个循环负载波形（标准三角形和型梯形波形）和三个温度（100°C，250℃和400°C），以研究机械响应和这种含有含有（am）铝合金的相关微观结构变化。发现体积机械反应表现出连续的循环软化，降低应力松弛和每循环减少的能量耗散。压力松弛受到400°C的测试温度上升至几乎完全放松的影响。在较低温度（100°C和250°C）下，温度越高，循环载荷期间开发的越多。高达250°C，子粒尺寸随温度和激光粉末熔接缺陷的优先​​用作疲劳裂纹引发位点。虽然在400℃下，在循环变形期间沉淀粗SI颗粒沉淀，并且从这些粗Si沉淀物中核化的高密度，这会产生和连杆引起失效，导致凹陷的延性骨折。

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  • 来源
    《International Journal of Fatigue》 |2021年第10期|106408.1-106408.13|共13页
  • 作者

    Jianguang Bao; Zhengkai Wu; Shengchuan Wu; Philip J. Withers; Fei Li; Saad Ahmed; Adil Benaarbia; Wei Sun;

  • 作者单位

    Research Institute of Aero-engine Beihang University Beijing 100191 China Faculty of Engineering University of Nottingham Nottingham NG7 2RD United Kingdom;

    State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China;

    State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China;

    Henry Royce Institute Department of Materials University of Manchester Manchester M13 9PL United Kingdom;

    Faculty of Engineering University of Nottingham Nottingham NG7 2RD United Kingdom Chengdu Aircraft Industrial (Group) CO. LTD Chengdu Sichuan 610092 China;

    Henry Royce Institute Department of Materials University of Manchester Manchester M13 9PL United Kingdom;

    Arts et Metiers Institute of Technology CNRS Universite de Lorraine LEM3 F-57000 Metz France;

    Faculty of Engineering University of Nottingham Nottingham NG7 2RD United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Low cycle fatigue (LCF); Elevated temperature; Subgrain; X-ray tomography (CT); Laser powder bead fusion (LPBF);

    机译：低循环疲劳（LCF）;温度升高;粒子;X射线断层扫描（CT）;激光粉末珠融合（LPBF）;

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