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随着发动机日益发展的需要,为了不断提高燃气涡轮的工作温度,必须进一步提高镍基高温合金的高温性能,要求材料兼具有较高的中、高温强度和高温抗腐蚀能力。目前所用的γ′相沉淀硬化镍基合金,虽具有较好的中温强度,但在高温时由于γ′相集聚长大,其强度急剧下降。要提高其高温性能,单靠γ′相强化是不够的,铸造高温合金发展也是有限的。因此用传统的铸造、变形工艺已无能为力。
With the development of engine needs, in order to continuously improve the working temperature of gas turbine, it is necessary to further improve the high-temperature performance of nickel-base superalloy, requiring both medium and high temperature strength and high temperature corrosion resistance. The presently used γ ’phase precipitation hardening nickel-based alloys, although having good mid-temperature strength, have a sharp decrease in strength at high temperatures due to the aggregation of the γ’ phase. To improve its high temperature performance, alone γ ’phase strengthening is not enough, casting superalloy development is limited. Therefore, with the traditional casting, deformation process has been powerless.