Influence of primary and secondary orientations on creep rupture behavior of aluminized single crystal Ni-based superalloy
Influence of primary and secondary orientations on creep rupture behavior of aluminized single crystal Ni-based superalloy
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DOI：
10.1016/j.msea.2014.02.079
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发表时间：
2014-05
期刊：
影响因子：
6.4
通讯作者：
K. Kakehi;F. Latief;T. Sato
中科院分区：
文献类型：
--
作者：
K. Kakehi;F. Latief;T. Sato
研究了在不同拉应力方向和侧面取向的高温下，一次和二次取向对渗铝单晶镍基高温合金蠕变行为的影响。样品在氩气流下于 1000°C 下进行包渗铝处理 5 小时。厚样品的蠕变断裂试验在 900 °C/392 MPa 下进行，薄样品的蠕变断裂试验在 900 °C/300 MPa 下进行。由于硬化扩散层中裂纹的萌生，渗铝处理降低了高温合金的蠕变强度。此外，还发现薄镀铝样品的蠕变强度不仅受到拉伸方向上的晶体取向的影响，而且还受到厚度方向上的晶体取向的影响。这是由于{111}面晶体几何形状的差异造成的，这与平面上<112>方向剪切应力的大小以及裂纹扩展引起的有效横截面变化有关。
Influence of primary and secondary orientations on the creep behavior of aluminized single crystal Ni-based superalloy was investigated at a high temperature with various tensile stress directions and side-surface orientations. The specimens were aluminized by pack aluminizing treatment at 1000 °C for 5 h under argon flow. The creep rupture tests were performed at 900 °C/392 MPa for thick specimens and at 900 °C/300 MPa for the thin specimens. The aluminizing treatment reduced the creep strength of the superalloy because of the crack initiation in hardened diffusion layers. Furthermore, it was found that the creep strength of thin aluminized specimens was affected by the crystallographic orientations, not only in the tensile direction, but also in the thickness direction. This is due to the difference in the crystallographic geometry of {111} planes, which is associated with the magnitude of <112> direction shear stress on the planes and the effective cross-section change by the crack propagation.