Microstructures and stress-rupture properties of DD5 single crystal superalloy joints brazed with a Nickel-based filler metal

LI Sisi; MAO Wei; CHEN Bo; CHENG Yaoyong; PEI Chong; XIONG Huaping; CHEN Hao

doi:10.7512/j.issn.1001-2303.2020.09.33

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Microstructures and stress-rupture properties of DD5 single crystal superalloy joints brazed with a Nickel-based filler metal
Vol. 50, Issue 9, Pages: 286-290(2020)
DOI： 10.7512/j.issn.1001-2303.2020.09.33

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LI Sisi, MAO Wei, CHEN Bo, et al. Microstructures and stress-rupture properties of DD5 single crystal superalloy joints brazed with a Nickel-based filler metal. [J]. 50(9):286-290(2020)
DOI：

LI Sisi, MAO Wei, CHEN Bo, et al. Microstructures and stress-rupture properties of DD5 single crystal superalloy joints brazed with a Nickel-based filler metal. [J]. 50(9):286-290(2020) DOI： 10.7512/j.issn.1001-2303.2020.09.33.

摘要

DD5单晶高温合金的焊接质量在航空发动机叶片的制造中十分关键。采用NiNbCoWCrAlSiMo(俄ВПр24)钎料,在一定钎焊条件下对DD5单晶高温合金进行钎焊试验。结果表明,NiNbCoWCrAlSiMo(俄ВПр24)钎料可实现DD5单晶高温合金的钎焊,接头冶金连接良好,无裂纹、孔洞等缺陷;钎缝组织较复杂,为γ+γ’双相组织基体上分布硅化物、碳硼复合化合物、碳硼硅复合化合物等相;钎焊间隙对接头高温持久性能有影响,钎焊间隙为0.1mm时,接头980℃/100h的持久强度可达到80MPa。

Abstract

Joining of DD5 single crystal superalloy is extremely important for the manufacturing of the blades and vanes in aero-engines. In this paper, the DD5 single crystal superalloy was brazed with NiNbCoWCrAlSiMo（ВПр24） filler metal. Sound joints were obtained. The joint microstructure was complicated. The interface reaction products could be characterized as carbides, borides and silicides compounds distributed on the γ+γ’ dual-phase matrix. Meanwhile, it was fount that the joint gap had an effect on the joint stress-rupture strength. With the joint gap of 0.1 mm, the joint stress-rupture strength under the condition of 980?/100 h reached 80 MPa.