A-27 高温タービンディスク用超耐熱合金の動向と新しいTMW合金の開発(材料,一般講演)

概要

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Recently, we developed a new kind of cast-and-wrought (C&W) Ni-Co base superalloys (TMW alloys) for the applications of turbine disk and high-pressure compressor. TMW alloys were designed by mixing two kinds of γ/γ' two-phase superalloys, Ni-base superalloy and Co-Ti alloy. The thermal capability of TMW alloy aimed 50 ℃ up compared to the best of current C&W disk superalloys, U720Li. In the subscale study, the forgeability of 50 kg ingot were identified by the processes of extrusion, hot rolling and manufacturing pancakes. The property assessments of the rolled plates indicated the temperature advantage of TMW alloys. The successful manufacturing of full-scale pancakes of some TMW alloys proved that fine grain structures of about 10 μm could be obtained and good processability could be expected. Results of tensile and creep tests of the pancakes showed that the thermal capability of TMW alloys increased at least 50 ℃ compared to U720Li.
公益社団法人日本ガスタービン学会の論文
2009-10-21