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Effect of misaligned grain deviation on high-temperature tensile properties of directionally solidified DZ409 superalloy
发布时间：2026-05-18
点击次数：
- 发布时间：
- 2026-05-18
- DOI码：
- 10.1016/j.msea.2026.150438
- 论文名称：
- Effect of misaligned grain deviation on high-temperature tensile properties of directionally solidified DZ409 superalloy
- 发表刊物：
- Materials Science & Engineering A
- 关键字：
- Directionally solidification Misaligned grain defect Columnar-grain Turbine blades High-temperature performance
- 摘要：
- The misaligned grain, macroscopically characterized by a deviation of the grain boundaries from the principal
stress direction, is a common defect in directionally solidified (DS) columnar-grained turbine blades. However,
the influence of misaligned grain defects on the high-temperature mechanical properties is unclear. This study
investigates the high-temperature tensile properties at 650
◦
◦
C and 950
◦
C of the DZ409 superalloy to explore the
relationship between the grain boundary deviation angle and high-temperature performance. The results indicate
that at 650
C, the yield strength and elongation decrease gradually with increasing deviation angle by
approximately variations of 102 MPa and 1.8 %, respectively. In contrast, at 950
◦
C, the deviation angle has a
negligible effect on yield strength with an increase of 29 MPa and elongation with a reduction of 1.1 %. This
discrepancy in the influence of deviation angle on tensile properties at different temperatures is attributed to a
difference in fracture mechanisms. This study provides a new insight into the impact of misaligned grain defects
on high-temperature performance from angle dependence and temperature dependence.
- 第一作者：
- Haiyang Song
- 论文类型：
- 期刊论文
- 是否译文：
- 否
