DEVELOPMENT OF NEXT-GENERATION NI-BASE SINGLE CRYSTAL SUPERALLOYS

By Y. Koizumi, Toshiharu Kobayashi, T. Yokokawa, Jian-xin Zhang, M. Osawa, H. Harada, Y. Aoki, Mikiya Arai. 2004

143 citations recorded by the source corpus.

Based on a fourth generation single crystal (SC) superalloy, TMS-138, we designed new SC alloys that contain higher amount of refractory elements, Nb, Ta, Mo, or Re, for strengthening. The Ru content was also increased to improve the phase stability. The creep strength and microstructure of these alloys were examined and compared with those of the base alloy TMS-138 and a third generation SC superalloy, CMSX-10K. As predicted by our alloy design program, TMS-162 (Mo and Ru addition) and TMS-173 (Re and Ru addition) exhibited excellent creep properties. Their times to 1% creep deformation at 1100qC/137MPa were about 2.5 times as long as that of TMS-138 and 5 times as long as that of CMSX-10K. The temperature capability of TMS-162 has reached a project target of 1100qC under stress at 137MPa and a creep rupture life as long as 1000 h, which is the highest ever reported.

Subfields: Biomedical Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/20989eeb36156694153a4f87632812f202bb604c