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Fatigue crack propagation of nickel-base superalloys at 650 deg C

机译:650℃下镍基高温合金的疲劳裂纹扩展

摘要

The 650 C fatigue crack propagation behavior of two nickel-base superalloys, Rene 95 and Waspaloy, is studied with particular emphasis placed on understanding the roles of creep, environment, and two key grain boundary alloying additions, boron and zirconium. Comparison of air and vacuum data shows the air environment to be detrimental over a wide range of frequencies for both alloys. More in-depth analysis on Rene 95 shows at lower frequencies, such as 0.02 Hz, failure in air occurs by intergranular, environmentally-assisted creep crack growth, while at higher frequencies, up to 5.0 Hz, environmental interactions are still evident but creep effects are minimized. The effect of B and Zr in Waspaloy is found to be important where environmental and/or creep interactions are presented. In those instances, removal of B and Zr dramatically increases crack growth and it is therefore plausible that effective dilution of these elements may explain a previously observed trend in which crack growth rates increase with decreasing grain size.
机译:研究了两种镍基高温合金Rene 95和Waspaloy的650 C疲劳裂纹扩展行为,并特别着重于了解蠕变,环境以及两种关键的晶界合金添加剂硼和锆的作用。空气和真空数据的比较表明,两种合金的空气环境在很大的频率范围内都是有害的。对Rene 95的更深入分析表明,在较低的频率(例如0.02 Hz)下,空气中的破坏是由晶间的,环境辅助的蠕变裂纹增长引起的,而在较高的频率下(高达5.0 Hz),环境相互作用仍然很明显,但是蠕变效应被最小化。在存在环境和/或蠕变相互作用的地方,发现Waspaloy中B和Zr的影响很重要。在那些情况下,去除B和Zr会显着增加裂纹的生长,因此,有效稀释这些元素可以解释先前观察到的趋势,即裂纹生长速率随晶粒尺寸的减小而增加。

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