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.
参考文献
| [1] | Volker S;Monika F K .Orientation Dependence of Dislocation Structures and Deformation Mechanisms in Creep Deformed CMSX-4 Single Crystals[J].Materials Science and Engineer- ing,1998,245A:19. |
| [2] | Gunturi S S K;MacLachlan D W;Knowles D M .Anisotropic Creep in CMSX-4 in Orientations Distant From 《001》[J].Materials Science and Engineering,2000,289A:289. |
| [3] | Qi W;Brocks W;Bertram A .An FE Analysis of Anisotropic Creep Damage and Formation in the Single Crystal SRR99 Un- der Multiaxial Loads[J].Computational Materials Science,2000,19:292. |
| [4] | Rae C M F;Matan N;Reed R C .The Role of Stacking Fault Shear in the Primary Creep of[001]- Oriented Single Crystal Superalloys at 750 ℃ and 750 MPa[[J].Materials Science and Engineering,2001,300A:125. |
| [5] | Maclachlan D W;Gunturi G S K;Knowles D M .Modelling the Uniaxial Creep Anisotropy of Nickel Base Single Crystal Super alloys CMSX-4 and RR2000 at 1023 K Using a Slip System Based Finite Element Approach[J].Computational Materials Science,2002,25:129. |
| [6] | LI Jia-rong;ZHONG Zhen-gang;TANG Ding-zhong.A Low-Cost Second Generation Single Crystal Superalloy DD6[A].Warrendale:TMS,2000:777. |
| [7] | Fuchs G E;Boutwell B A .Modeling of the Partitioning and Phase Transformation Temperatures of an As Case Third Gen- eration Single Crystal Ni-Base Superalloy[J].Materials Sci- ence and Engineering,2002,333A:72. |
| [8] | Chen Q Z;Kong Y H;Jones C N et al.Porosity Reduction by Minor Additions in RR2086 Superalloy[J].Scripta Materialia,2004,51:155. |
| [9] | Pollock T M;Argon A S.Intermediate Temperature Creep De- formation in CMSX-3 Single Crystals[A].Warrendale:TMS,1988:285. |
| [10] | CHEN De-hou;WU Zhong-tang;ZHONG Zhen-gang.Transverse Stress Rupture Properties of Single Crystal Super- alloy DD3 at Mediate Temperature[J].Aeronautical Materi- als,1985:3,1. |
| [11] | Shah D M;Cetel A.Evaluation of PWA1483 for Large Single Crystal IGT Blade Applications[A].War- rendale:TMS,2000:295. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%