研究了高温长期时效对一种镍基单晶合金组织和在1010℃/248MPa条件下的持久性能的影响.结果表明:950℃时效500h以前,合金的持久性能变化不大,时效1000h后合金的持久性能大幅度降低,1050℃时效100h后,合金的持久性能便开始明显下降,持久性能降低的原因是γ′相尺寸的增大及形状不规整.合金在950℃时效500h和1050℃时效100h后,γ′相开始沿不同的[100]方向长大,γ/γ′相界面能和弹性应变能的降低是γ′相长大的驱动力.
参考文献
| [1] | Tawancy H M .Long-term ageing characteristics of hastelloy alloy X[J].Journal of Materials Science,1983,18:2976-2986. |
| [2] | Lai G Y .An investigation of the thermal stability of a commercial Ni-Cr-Fe-Mo alloy (hastelloy alloy X)[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1978,9(09):827-833. |
| [3] | 王淑荷;郭建亭;赖万慧 等.GH903高温合金650℃长期时效后的组织与性能[J].金属学报,1990,26(06):A432-435. |
| [4] | 姜文辉;姚向东;管恒荣;胡壮麒 .DZ40M钴基高温合金950℃长期时效后的组织与性能[J].金属学报,1998,34(12):1289-1292. |
| [5] | Caron P;KHAN T .Improvement of creep strength in a nickl-base single crystal superalloy by heat treatment[J].Materials Science and Engineering,1983,61:173-184. |
| [6] | CARON P;etal.Creep deformation anisotropy in single crystal superalloys[C].Superalloy,1988:215-224. |
| [7] | Mackay R A;NATHAL M V;PEARSON D D .Influence of the molybdenum on the creep properties of nickel-base superalloy single crystals[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1990,21:381-388. |
| [8] | Muller L et al.Modelling thermal misfit stresses in nickel-base superalloys containing high volume fraction of γ' phase[J].冶金材料学报,1992,40(06):1321-1327. |
| [9] | 田素贵 .单晶镍基合金组织演化与蠕变行为及微观特征的研究[D].东北大学,1998. |
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