Effects of Dendritic Orientation on Stress Rupture Properties of DD6 Single Crystal Superalloy

被引：3

作者：

Shi Zhen-xue ^{[1
]}

Li Jia-rong ^{[1
]}

Liu Shi-zhong ^{[1
]}

Zhao Jin-qian ^{[1
]}

机构：

[1] Beijing Inst Aeronaut Mat, Natl Key Lab Sci & Technol Adv High Temp Struct M, Beijing 100095, Peoples R China

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2011年 / 18卷 / 10期

关键词：

DD6; single crystal superalloy; stress rupture property; fracture behaviour; ANISOTROPIC CREEP; CMSX-4;

D O I：

10.1016/S1006-706X(12)60024-7

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

DD6 single crystal superalloy slabs were prepared with seed method in the directionally solidified furnace with high temperature gradient. The transverse stress rupture properties and fracture behaviour of the alloy at 760 degrees C /758 MPa, 850 degrees C /550 MPa and 980 degrees C/250 MPa were investigated and compared with those of longitudinal specimens. The transverse stress rupture lives are corresponding with the longitudinal stress rupture lives at 760 degrees C /758 MPa and 850 degrees C /550 MPa. The transverse stress rupture lives are slightly less than the longitudinal stress rupture lives at 980 degrees C/250 MPa. The fracture mechanism of the transverse stress rupture of the alloy at 760 degrees C/758 MPa shows quasi-cleavage mode and the fracture mechanism at 980 degrees C/250 MPa shows dimple mode, while the fracture mechanism at 850 degrees C/ 550 MPa shows quasi-cleavage and dimple mixture mode. At higher temperature and lower stress, the microcracks are easier to initiate and interconnect in the transverse specimen than those in longitudinal specimen because there are interdendritic regions perpendicular to the axis of stress.

引用

页码：66 / 71

页数：6

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