Experimental Study on Fatigue Crack Growth Behavior of Direct Aging GH4169 Superalloy

HE Yu-huai; YU Hui-chen; GUO Wei-bin; SHEN Li-li; SU Bin

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Experimental Study on Fatigue Crack Growth Behavior of Direct Aging GH4169 Superalloy

更新时间：2026-07-07

- Experimental Study on Fatigue Crack Growth Behavior of Direct Aging GH4169 Superalloy
- Vol. 21, Issue 2, (2006)
- 作者机构：
  
  北京航空材料研究院,北京,100095
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2006
- 稿件说明：
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HE Yu-huai, YU Hui-chen, GUO Wei-bin, et al. Experimental Study on Fatigue Crack Growth Behavior of Direct Aging GH4169 Superalloy[J]. 2006, 21(2).
DOI：

HE Yu-huai, YU Hui-chen, GUO Wei-bin, et al. Experimental Study on Fatigue Crack Growth Behavior of Direct Aging GH4169 Superalloy[J]. 2006, 21(2). DOI：

摘要

对直接时效GH 4169高温合金的疲劳裂纹扩展性能进行了试验研究。分别研究了厚度、温度、应力比等因素对直接时效GH 4169高温合金疲劳裂纹扩展性能的影响。结果表明

在410 mm的厚度范围内

厚度对直接时效GH 4169高温合金疲劳裂纹扩展性能几乎没有影响

但厚度为2 mm且应力比为0.1时其裂纹扩展速率稍有下降;应力比对直接时效GH 4169高温合金疲劳裂纹扩展的影响随着应力比的提高逐渐减小;温度的提高对直接时效GH 4169的裂纹扩展速率有明显的加速作用

但是随着应力强度因子范围的增加

其影响逐渐减小

氧化作用是加速其裂纹扩展的主要机理。

Abstract

Fatigue crack growth tests were conducted on a CT specimen of a nickel base superalloy direct aging GH4169.The effects of thickness

temperature and stress ratio on fatigue crack growth behavior were studied separately.The key results are as follows:thickness has no effect on fatigue crack growth behavior in the thickness range from 4 mm to 10 mm

but as thickness is decreased to 2 mm

the fatigue crack growth rate decreases when stress ratio is 0.1;the effect of stress ratio on fatigue crack growth rate diminishes as stress ratio increases;increasing temperature accelerates fatigue crack growth rate

but the effect of temperature diminishes with the increase of stress intensity factor and the main mechanism for accelerating fatigue crack growth is oxidation.

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