Development of A Grain Defect Resistant Ni-Based Single Crystal Superalloy YH61

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When single crystal (SC) castings are adopted for industrial gas turbine's (IGT's) components, some degree of grain defects should be permitted to increase casting yield and reduce cost of the castings. In this paper, a new SC superalloy YH61 is proposed to solve the problem of grain defects which are present in SC buckets or vanes of IGTs. First, the effects of solution heat treatment on various properties of the SC with and without grain defects were evaluated. Increasing the solution-heattreated area was found to have a positive effect on the strength of a defect-free SC but harmful for the strength across a grain boundary. The solution heat treatment condition for YH61 was determined after considering compatibility for properties of both the defect-free SC and the SC with grain defects. The solution heat treatment was also found to improve hot corrosion resistance of the alloy. Secondly, more detailed creep and hot corrosion tests were performed for YH61 solution-heat-treated by one of the above-examined conditions. YH61 showed higher creep strength than that of a second-generation directionally solidified (DS) superalloy although Re content of YH61 is about half as much as that of second-generation DS superalloys. Hot corrosion resistance of YH61 was superior to that of a second-generation DS superalloy under the whole experimental temperature range and to that of a 14% chromium containing conventional cast (CC) superalloy, which is currently used in some IGTs, when the test temperature was 1000℃.
公益社団法人日本ガスタービン学会の論文
2006-03-20

Development of A Grain Defect Resistant Ni-Based Single Crystal Superalloy YH61

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