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

SHI Zhen-xue; LI Jia-rong; LIU Shi-zhong; ZHAOJin-qian

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

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DD6 single crystal superalloy slabs were prepared with seed method in the direetionally solidified furnace with high temperature gradient. The transverse stress rupture properties and fracture hehaviour of the alloy at 760 ℃/758 MPa, 850 ℃/550 MPa and 980 ℃/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 ℃/758 MPa and 850 ℃/550 MPa. The transverse stress rupture lives are slightly less than the longitudinal stress rupture lives at 980 ℃/ 250 MPa. The fracture mechanism of the transverse stress rupture of the alloy at 760 ℃/758 MPa shows quasi-cleav- age mode and the fracture mechanism at 980 ℃/250 MPa shows dimple mode, while the fracture mechanism at 850 ℃/ 550 MPa shows quasi-cleavage and dimple mixture mode. At higher temperature and lower stress, the microeracks 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.

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《钢铁研究学报（英文版）》 |2011年第10期|66-71|共6页
作者
SHI Zhen-xue; LI Jia-rong; LIU Shi-zhong; ZHAOJin-qian;
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作者单位

National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

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正文语种 chi
中图分类金属材料;
关键词
DD6单晶高温合金; 横向应力; 断裂性能; 高温度梯度; 树突; 断裂机制; 纵向应力; 破裂性;

机译：DD6单晶高温合金;横向应力;断裂性能;高温度梯度;树突;断裂机制;纵向应力;破裂性;

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

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