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Effects of rejuvenation heat treatment on microstructure and creep property of a Ni-based single crystal superalloy
Journal of Materials Science & Technology ( IF 10.9 ) Pub Date : 2020-07-07 , DOI: 10.1016/j.jmst.2020.05.032
K.J. Tan , X.G. Wang , J.J. Liang , J. Meng , Y.Z. Zhou , X.F. Sun

Both surface and internal microstructures of a second-generation Ni-based single crystal (SX) superalloy were studied after creep and rejuvenation heat treatment (RHT). It is indicated that the microstructures, such as the dislocation network, the γ phase and the γ' phase, can be recovered to those after the standard heat treatment (SHT). It is found that RHT affected zone (RAZ) formed at the surface is composed of the γ'-free layer, the transition layer and the recrystallization (RX), which are less than 20 μm in depth totally. Such depth of the RAZ doesn’t affect the properties of the superalloy. The morphology of γ' phase at the RAZ is related to the composition of the elements. The average creep life after RHT is close to the average life after SHT. It is concluded that RHT could effectively repair SX parts and increase the total life of the sample after a damage by creep.



中文翻译:

回春热处理对Ni基单晶高温合金组织和蠕变性能的影响

经过蠕变和回春热处理(RHT)后,研究了第二代Ni基单晶(SX)高温合金的表面和内部微观结构。结果表明,位错网络,γ相和γ'相等显微组织可以恢复到标准热处理(SHT)后的组织。发现在表面形成的RHT影响区(RAZ)由无γ′层,过渡层和重结晶(RX)组成,它们的总深度小于20μm。RAZ的深度不会影响超级合金的性能。RAZ处γ'相的形态与元素的组成有关。RHT之后的平均蠕变寿命接近SHT之后的平均寿命。

更新日期:2020-07-07
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