B-6 Ni-Co基超耐熱合金TMW2+4Co製鍛造ディスクの組織と機械的性質(高温材料,一般講演)

概要

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The new Ni-Co base alloys (TMW alloys) have been developed, recently. The concept behind the alloy design is adding Co and Ti simultaneously to Alloy720Li expecting high microstructural stability and properties. One of a candidate alloy (TMW2+4Co) was processed to the real size pancake disk by cast and wrought method, and this alloy was found to have high processability and workability. This report describes the microstructure and the mechanical properties of the real size disk. TMW2+4Co showed high tensile, creep and low cycle fatigue properties which were equivalent or greater in some degree compared with Alloy720Li. Especially, the creep strength was high and the Larson-Miller plots showed this alloy had higher temperature capability than that of Alloy720Li by at least 10℃. From these results, TMW alloys are expected to be the next generation C&W alloys for turbine disks.
公益社団法人日本ガスタービン学会の論文
2007-09-01