Effect of holding time on interfacial evolution and mechanical strength of wide-gap brazed K417G superalloy joints

IF 2.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Welding in the World Pub Date : 2024-08-26 DOI:10.1007/s40194-024-01828-z
Xinyu Ren, Hao Wang, Wenwen Li, Qi Dong, Bo Chen, Wei Mao
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Abstract

K417G superalloy is widely applied in gas turbine components such as blades, vanes, and nozzles. In this study, wide-gap brazing of K417G superalloy is investigated using BNi-5 filler alloy. The brazing experiment is conducted at 1150 °C for different holding times with the fixed gap of 0.2 mm. For the joints brazed for 15 min, the brazing seam mainly consists of γ/γ’ phase, Ni2Si and TiC phase. The average tensile strength tested at 950 °C is 401 MPa. As the holding time increased, the excessive element diffusion phenomenon is observed. Hence, Ni2Si intermetallic phases gradually become embedded in the additive alloy particles. The interfacial evolution and fracture behavior are discussed.

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保温时间对宽间隙钎焊 K417G 超合金接头界面演变和机械强度的影响
K417G 超合金广泛应用于燃气轮机部件,如叶片、叶片和喷嘴。本研究使用 BNi-5 填充合金研究了 K417G 超耐热合金的宽间隙钎焊。钎焊实验在 1150 °C、固定间隙为 0.2 mm 的不同保温时间下进行。对于钎焊 15 分钟的接头,钎缝主要由 γ/γ'相、Ni2Si 和 TiC 相组成。在 950 °C 下测试的平均拉伸强度为 401 MPa。随着保温时间的延长,观察到元素过度扩散现象。因此,Ni2Si 金属间相逐渐嵌入添加剂合金颗粒中。本文讨论了界面演变和断裂行为。
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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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