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以镍基高温合金GH4169为对象,研究了600℃时不同取向的3种镍基单晶合金在不同低周疲劳下的循环变形行为,采用计算机软件对试验数据进行拟合分析。结果表明,3种取向[001]、[011]和[111]的镍基单晶合金,在不同总应变幅下的硬化曲线均在高总应变幅时表现为循环硬化,在低总应变幅时为循环稳定的特征;[001]取向的合金在0.6%总应变幅下的应力-应变为线性关系,显示出弹性变形的特点;在0.85%总应变幅下发生塑性变形;当总应变幅增加到1%时,可以观察到合金中位错缠结,且位错密度明显增大。
The cyclic deformation behavior of three nickel-based single crystal alloys with different orientations at 600 ℃ under different low-cycle fatigue cycles was studied with nickel-based superalloy GH4169. The fitting test was performed by computer software. The results show that the hardening curves of the three kinds of oriented [001], [011] and [111] Ni-based single crystal alloys under different total strain amplitude show cyclic hardening at high total strain amplitude. (001) orientation alloy stress-strain at 0.6% of the total strain amplitude of a linear relationship, showing the characteristics of elastic deformation; 0.85% total strain amplitude plastic deformation occurs; when the total strain amplitude Increasing to 1%, dislocation entanglement can be observed in the alloy, and the dislocation density is significantly increased.