| GH33A疲劳/蠕变交互作用下裂纹扩展特性研究 |
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| 引用本文： | 王荣,田长生.GH33A疲劳/蠕变交互作用下裂纹扩展特性研究[J].航空学报,1987,8(10):504-512. |
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| 作者姓名： | 王荣 田长生 |
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| 作者单位： | 西北工业大学
(王荣)，西北工业大学(田长生) |
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| 摘 要： | 本文采用交流电位法研究了镍基高温合金GH33A在700℃、疲劳/蠕变交互作用下的裂纹扩展特性。用光学显微镜和扫描电镜对断裂特征进行了分析。结果表明:疲劳/蠕变交互作用加速裂纹扩展,且dα/dN和⊿K在双对数坐标上呈折线规律变化,实验证明:弹塑性断裂力学参数C作为疲劳/蠕变交互作用下裂纹扩展判据是可行的,并建立了经验关系式。疲劳/蠕变交互作用促进裂纹沿晶扩展。主裂纹与W型微裂纹的连接和沿滑移面剪切型扩展是疲劳/蠕变交互作用的两种主要微观断裂机理。
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| 收稿时间： | 1986-10-20; |
INVESTIGATION OF CRACK GROWTH PROPERTY UNDER FATIGUE-CREEP INTERACTIONS IN ALLOY GH33A |
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| Wang RongTian Changsheng.INVESTIGATION OF CRACK GROWTH PROPERTY UNDER FATIGUE-CREEP INTERACTIONS IN ALLOY GH33A[J].Acta Aeronautica et Astronautica Sinica,1987,8(10):504-512. |
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| Authors: | Wang RongTian Changsheng |
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| Institution: | Northwestern Polytechnical University |
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| Abstract: | The crack growth property under fatigue-creep interactions in nickel-base superalloy GH33A at 700 C is investigated with the alternate electric potential technique.The fracture feature is analyzed with optical microscopes and SEM. It is shown that the fatigue-creep interactions accelerate the crack prowth, and log（da/dN） varies with log（ K）in accordance with the broken line rule. As indicated by experiwents, it is possible to use the elastic -plastic fracture mechanics parameter C*as the criterion of the crack growth under fatigue-creep interaction.The equation of crack growth rate is （da/dN） = 6.00×10-2C*0.78Fatigue-creep interactions cause intergranular growth to appear, and both the link of main crack with W type micro-crack and the shearing fracture along the sliping plane are two main micro-mechanisms of fatigue-creep interactions. |
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