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首页> 外文会议>International Symposium on Safety and Structural Integrity; 20050117-20; Singapore(SG) >The Oxidation and High Temperature Fatigue of P23 alloy
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The Oxidation and High Temperature Fatigue of P23 alloy

机译：P23合金的氧化和高温疲劳

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The purpose of this study is to investigate the effect of oxidation on fatigue crack growth behavior of P23 alloy at high temperature. Fatigue tests were performed using compact tension specimens at 500～600℃, at the loading frequency of 20～0.01 Hz. The fatigue crack growth behavior was characterized using the ΔK parameter. The crack growth rate was found to be greater at lower frequencies and higher temperatures. The oxidation rate and ingredients were investigated after P23 alloy was oxidized at 500～650℃ isothermally in air up to 50 hours. The oxide scale thickened as the temperature increased. The oxide scale consisted primarily of Fe_2O_3. From the results of microstractural examination, it was found that in all tests, the crack growth path was transgranular. The crack growth behavior was cyclic-dependent with branch cracks at 20Hz and lHz. At 0.01 Hz, the growth behavior was time dependant with a single crack induced by oxidation.
机译：这项研究的目的是研究氧化对P23合金在高温下疲劳裂纹扩展行为的影响。用紧凑的拉伸试样在500〜600℃，20〜0.01Hz的加载频率下进行疲劳试验。使用ΔK参数表征疲劳裂纹扩展行为。发现在较低的频率和较高的温度下，裂纹的扩展速率更大。研究了P23合金在空气中500〜650℃下等温氧化50小时后的氧化速率和成分。随着温度升高，氧化皮变厚。氧化皮主要由Fe_2O_3组成。从显微结构检查的结果发现，在所有测试中，裂纹的发展路径都是沿晶的。裂纹扩展行为与循环有关，在20Hz和1Hz处出现分支裂纹。在0.01 Hz时，生长行为随时间而变，氧化导致单个裂纹。

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