Crack initiation and propagation behaviour under high-temperature very-high-cycle fatigue: Directionally solidified columnar-grained vs. single-crystal superalloys
Crack initiation and propagation behaviour under high-temperature very-high-cycle fatigue: Directionally solidified columnar-grained vs. single-crystal superalloys
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高温极高周疲劳下的裂纹萌生和扩展行为：定向凝固柱状晶与单晶高温合金
DOI：
10.1016/j.msea.2022.142711
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发表时间：
2022-01
期刊：
影响因子：
6.4
通讯作者：
Chen B.
中科院分区：
文献类型：
--
作者：
Zhao Z.;Liang Z.;Li Q.;Zhang F.;Chen B.
研究了氧化和再结晶对柱状晶DZ125和单晶DD6高温合金高周疲劳的影响。随着DZ125的温度从850℃升高到1000℃，DD6的温度从1000℃升高到1100℃，由于内部氧化物的渗透，i型开裂倾向增加。再结晶可以发生在电解抛光和机械抛光的表面条件下，主要由温度和测试持续时间控制。它的存在会导致表面下的应变局部化，但表面再结晶并不一定决定氧化物的渗透。与单晶DD6相比，柱状晶DZ125在1000℃时表现为纯粹的I型裂纹，而柱状晶DZ125表现为明显的I型裂纹，随后是I型裂纹扩展。DZ125的这种断裂特征可归因于高角度晶界和远场应力的共同作用。当裂纹长度较小时，微观组织相关因素起着至关重要的作用，而当裂纹长度相当于几个晶粒时，应力的作用起主导作用，最终导致从晶体学阶段I向模式I转变。
Role of oxidation and recrystallisation on very-high-cycle fatigue of columnar-grained DZ125 and single-crystal DD6 superalloys are investigated. With the temperature increase from 850 to 1000 °C for DZ125 while from 1000 to 1100 °C for DD6, the Mode-I cracking tendency increases due to internal oxide penetration. Recrystallisation can occur for both the electrolytically and mechanically polished surface conditions, controlled primarily by temperature and test duration. Its presence can lead to strain localisation at subsurface, but the surface recrystallisation does not necessarily determine the oxide penetration. By comparison with the single-crystal DD6 that shows the pure Stage I at 1000 °C, the columnar-grained DZ125 exhibits the distinctive Stage I cracking followed by Mode I propagation. This fracture characteristics in DZ125 can be attributed to the combined effect of the high-angle grain boundaries and far-field stress. The microstructure-related factor plays a vital role when the crack length is small, whereas the role of stress becomes predominant when the crack length is comparable to a couple of grains, ultimately leading to the shift from the crystallographic Stage I to Mode I propagation.
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DOI：
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发表时间：
2001-08
影响因子：
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