Development of Next Generation Ni-base Single Crystal Superalloys Containing Ruthenium

Development of Next Generation Ni-base Single Crystal Superalloys Containing Ruthenium
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下一代含钌镍基单晶高温合金的开发

DOI：
10.2320/jinstmet1952.67.9_468
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Mikiya Arai
Mikiya Arai
中科院分区：
--
文献类型：
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作者：
Y. Koizumi;Z. Jianxin;Toshiharu Kobayashi;T. Yokokawa;H. Harada;Y. Aoki;Mikiya Arai

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研制了一种蠕变强度优于第四代单晶高温合金的单晶高温合金。根据我们的合金设计程序提供的指导方针，在我们的第四代Sc高温合金之一TMS138中添加了Mo，以改变其晶格失配，使其变为更大的负数(AG&>Ag‘)。在负晶格失配较大的高温合金中，在g/g‘界面处有可能增强漂移并形成更细小的位错网络。此外，还添加了Ru，以抑制添加Mo时所期望的TCP相的形成。将所设计的162高温合金浇铸成SC棒材，进行固溶和时效热处理，并进行了137Mpa和1100℃的蠕变试验。结果表明，TMS162的蠕变持久强度温度能力比我们的第四代Sc合金TM138提高了约20℃。透射电子显微镜观察表明，新一代Sc合金16 2的g/g‘界面上生成的失配位错网络比设计的第四代Sc合金TMS13 8更细小。我们的结论是，更细小的位错网络增加了位错切割成g‘相所需的应力，使蠕变强度更高。
A single crystal superalloy with a superiority in creep strength to the fourth generation single crystal (SC) superalloys has been developed. Following the guideline given by our alloy design program, Mo was added to one of our fourth generation SC superalloy, TMS138, to change its lattice misfit toward larger negative (ag>ag′). In a superalloy with larger negative lattice misfit, enhancement of rafting and formation of finer dislocation network at the g/g′interface is expected. Ru was also added to suppress the formation of TCP phases which is expected with the Mo addition. The designed superalloy, TMS162, was cast to SC bars, solution and aging heattreated, and tested in terms of creep at 137 MPa and at 1100°C. The temperature capability of the creep rupture strength in the TMS162 was found to be about 20°C higher than that of our fourth generation SC alloy, TMS138. It was confirmed by transmission electron microscope observation that the misfit dislocation network generated on the g/g′interface in the rafted structure was finer in the new generation SC alloy, TMS162, than in the fourth generation SC alloy, TMS138, as designed. We concluded that the finer dislocation network increases the stress required to for dislocations to cut into g′phases and makes the creep strength higher.