4.7 Article

Evolution of geometrically necessary dislocation at the γ-γ′ interface and its effect on tensile deformation behaviour of disk super alloy

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.140855

关键词

GND; gamma '; Dislocation; Distortion; EBSD; Tensile

向作者/读者索取更多资源

The study on the evolution of geometrically necessary dislocation density (GND) at the gamma and primary gamma' interface during tensile deformation of turbine disk alloy revealed that GND values were highest at 800 degrees C and lowest at 350 degrees C, primarily due to the gamma/gamma' misfit value. At high temperatures, localized plastic deformation in the gamma-matrix near gamma-gamma' interfaces was identified as the main cause for necking after yielding, as evidenced by higher GND values and grain interior distortion.
The evolution of geometrically necessary dislocation density (GND) at the gamma and primary gamma' interface during tensile deformation of turbine disk alloy was studied. Extensive electron microscopy analysis (i.e. EBSD and TEM) was carried out to explore the structure and GND evolution at the gamma-gamma' interfaces. It is found that GND value is highest for tensile test specimens at 800 degrees C, whereas the lowest for tensile specimen tested at 350 degrees C, and this is attributed to gamma/gamma' misfit (delta) value. At high-temperature tensile deformation (i.e. at 720 and 800 degrees C) specimen starts necking just after the yield point, compared to RT, 350 and 650 degrees C tensile tested specimens. It is evidenced from GND values and grain interior distortion that localized plastic deformation in gamma-matrix near to gamma-gamma' interfaces is the primary reason for necking just after yielding of material. Higher GND values and grain interior distortion are caused by the greater value of delta at high test temperature due to difference in thermal expansion between gamma and gamma'.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据