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Fatigue Sensitivity to Small Defects of a Gamma-Titanium-Aluminide Alloy

机译：对γ-钛-铝化物合金小缺陷的疲劳敏感性

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摘要

The fatigue properties of a Ti-48AI-2Cr-2Nb alloy obtained by electron-beam melting (EBM) with a patented process has been examined by conducting high cycle fatigue tests performed at different R ratios at room temperature. Fatigue-crack propagation tests have been performed for the purpose of characterizing the fatigue-crack growth rate and threshold of the material. Additionally, specimens with artificially introduced defects have been fatigue tested with the objective of studying the growth behavior of small cracks. Artificial defects with different sizes have been generated in the gauge section of the specimens by electron-discharge machining (EDM). After EDM defects are produced, the specimens are pre-cracked in cyclic compression, so that small cracks can be generated at the root of the EDM starter defects. Fatigue tests are conducted by applying the staircase technique with the number of cycles of censored test (runout) fixed at 10~7 cycles. By employing the Murakami model for the calculation of the range of stress intensity factor, the threshold stress intensity factor range dependence on the loading ratio R and on the defect size is evaluated, highlighting the relevant parameters that govern the specific mechanisms of failure of the novel γ-TiAl alloy studied in the present work.
机译：通过在室温下以不同的R比进行高循环疲劳试验，研究了通过专利工艺通过电子束熔化（EBM）获得的Ti-48Al-2Cr-2Nb合金的疲劳性能。为了表征材料的疲劳裂纹扩展速率和阈值，已经进行了疲劳裂纹扩展测试。此外，为了研究小裂纹的生长行为，已经对具有人工引入缺陷的标本进行了疲劳测试。通过电子放电加工（EDM）在试样的标距部分产生了不同大小的人造缺陷。产生EDM缺陷后，将样品以循环压缩的方式进行预裂化，以便在EDM起始缺陷的根部产生小裂纹。通过采用阶梯技术进行疲劳测试，将审查测试（跳动）的周期数固定为10〜7个周期。通过使用村上模型计算应力强度因子的范围，评估了阈值应力强度因子范围对载荷比R和缺陷尺寸的依赖性，突出了控制该小说具体失效机理的相关参数。在目前的工作中研究了γ-TiAl合金。

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