Microstructure and typical properties of cast Ni-based superalloy K439B

doi:10.13251/j.issn.0254-6051.2023.01.017

Abstract

Abstract: Typical microstructure, long-term aging microstructural stability at 800 ℃ and main properties of cast Ni-based superalloy K439B were introduced and compared with that of K4169 and CM939 alloys. The results show that the K439B alloy has good comprehensive properties, and its tensile properties and temperature capability are equivalent to that of the CM939 alloy. The oxidation resistance and salt-coated hot-corrosion properties of the K439B alloy are better than that of the K4169 alloy at 800 ℃, and its gas hot-corrosion property is similar to that of the K4169 alloy at 800 ℃. Meanwhile, the K439B alloy is unsusceptible to the welding hot cracking. It has been applied in the casting of hot-section components for advanced aero engines and gas turbines such as combustor case, preswirl nozzle and nozzle ring, etc.

Key words: Ni-based superalloy, K439B alloy, aero engine, gas turbine, microstructure, property

CLC Number:

TG249.5

Chen Jingyang, Ren Xiaodong, Zhang Mingjun, Zhang Lihui, Tang Xin, Xiao Chengbo. Microstructure and typical properties of cast Ni-based superalloy K439B[J]. Heat Treatment of Metals, 2023, 48(1): 100-104.

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