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CMSX-4® PLUS (SLS): AN IMPROVED 3~(RD) GENERATION SINGLE CRYSTAL ALLOY

机译:CMSX-4®加(SLS):改进的3〜(RD)生成单晶合金

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Ongoing demand for advanced aero gas turbine engines with lower fuel burn and commensurate reduced CO_2 emissions require single crystal (SX) superalloys capable of operating at higher gas and metal temperatures beyond the capability of 2~(nd) generation, 3% rhenium (Re)-containing SX alloys, currently used extensively in commercial and military flight engines. These complex cooled turbine blades and vane castings must have an excellent balance of high temperature mechanical properties, producibility, oxidation/hot corrosion resistance, coating compatibility including TBC performance and phase stability. The highest strength nickel-base SX superalloys currently in production (3~(rd) generation CMSX-10K® and CMSX-10N® alloys) contain 6-7% Re. These highly alloyed, specialty alloys have some application drawbacks including some secondary reaction zone (SRZ) phase instability in the base alloy adjacent to the coatings, low temperature internal oxidation/hot corrosion attack requiring sophisticated dual role internal and external coatings and difficulty in production solution heat treatment. In addition, current 3rd generation SX alloys have relatively higher density which is a disadvantage in terms of weight and inertia in rotating part applications, and high cost due to the elevated Re content. An improved, lower Re content (4.8%), 3~(rd) generation SX superalloy, CMSX-4® Plus (SLS) has been developed with improved properties and performance over current 3~(rd) generation SX alloys, while lacking the drawbacks. Coatings have been successfully developed which are compatible with the base alloy and suitable bond coats for TBC application. This paper presents the characterization of CMSX-4 Plus (SLS) alloy, including composition, mechanical and physical properties, oxidation properties and phase stability, along with production status.
机译:持续对具有较低燃料燃烧和相称CO_2排放的先进航空燃气涡轮发动机的需求需要能够在更高的气体和金属温度下运行的单晶(SX)超合金,超过2〜(ND)产生的能力,3%铼(RE) - 统一的SX合金,目前在商业和军用飞行发动机中广泛使用。这些复合冷汽轮机叶片和叶片铸件必须具有优异的高温机械性能平衡,可生产性,氧化/热腐蚀性,涂层相容性,包括TBC性能和相位稳定性。目前在生产中的最高强度镍基SX超合金(3〜(RD)生成CMSX-10K和CMSX-10N®合金)含有6-7%的RE。这些高度合金化的特种合金具有一些应用缺点,包括邻近涂层的基础合金中的一些二级反应区(SRZ)相稳定性,低温内氧化/热腐蚀攻击,需要复杂的双重作用内部和外部涂层和生产溶液难度热处理。此外,电流的第3代SX合金具有相对较高的密度,其在旋转部件应用中的重量和惯性方面是缺点,并且由于升高的RE含量而导致的高成本。改进的更低的RE含量(4.8%),3〜(RD)生成SX Superaly,CMSX-4®加(SLS)已经开发出具有改进的特性和性能,而不是电流3〜(RD)生成SX合金,同时缺乏缺点。已成功开发涂层,其与用于TBC应用的基础合金和合适的粘合涂层相容。本文介绍了CMSX-4加(SLS)合金的表征,包括组成,机械和物理性质,氧化性能和相位稳定性以及生产状态。

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