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DD5单晶合金瞬时液相扩散焊接头组织性能研究
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深圳市万泽中南研究院有限公司

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深圳市科技计划项目(项目号JSGG20210802093205015)


Research on the Microstructure and Properties of the Transient Liquid Phase Bonding Joints of DD5 Single Crystal Alloy
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    摘要:

    采用自主研发的瞬时液相扩散焊(TLP)中间层材料,在1280 ℃/12h/0.01 MPa的焊接条件下进行DD5镍基单晶高温合金的TLP焊接试验,并使用SEM及热力学软件Jmatpro分析焊接接头显微组织及析出相,结果表明:中间层厚度对接头焊缝显微组织有较大影响,当中间层厚度为120 μm时,焊缝与母材的显微组织和成分趋近一致,未形成明显脆性析出相,焊缝中心线两侧的γ"相基本实现融合;当中间层厚度为160 μm和200 μm时,焊缝中的非等温凝固区(ASZ)由向日葵状共晶组织、鱼骨状的硼化物及富Ta、Hf的块状碳化物等脆性相组成。TLP焊接接头经过焊后热处理后,焊缝区的γ"正方度显著提高,尺寸与基体基本一致。在980 ℃/248 MPa条件下进行高温持久试验,当中间层厚度为120 μm时,持久寿命可达145.54h,并且随着中间层厚度的增加,接头的高温持久寿命不断降低,断裂模式由韧性断裂转变为脆性断裂。

    Abstract:

    The TLP welding test of DD5 Ni-based single crystal supperalloy was carried out under welding conditions of 1280 ℃/12h/0.01 MPa using the self-developed transient liquid phase bonding (TLP) interlayer material. The microstructure and precipitates of the welded joint were analyzed using SEM and the thermodynamic software Jmatpro. The results showed that the thickness of the interlayer had a significant impact on the microstructure of the welded joint. When the thickness of the interlayer was 120 μm, the microstructure and composition of the weld and the base metal tend to be consistent, and no obvious brittle precipitates are formed in the weld zone γ" Phase and matrix γ" The combination is basically complete; When the thickness of the interlayer is 160 μm and 200 μm, the ASZ is composed of brittle phases such as sunflower like eutectic structure, fishbone like borides, and block carbides rich in Ta and Hf. After PBHT, the γ" square degree of weld zone is significantly improved, and the size is basically consistent with the substrate. The Stress rupture test was conducted under the condition of 980 ℃/248MPa, When the thickness of the intermediate layer is 120 μm, the stress rupture life can reach 145.54h. And the results showed that as the thickness of the intermediate layer increased, the stress rupture life of the joint continued to decrease, and the fracture mode changed from ductile fracture to brittle fracture.

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魏利,尧健,张建庭,孙浩华,李砚卿,肖磊. DD5单晶合金瞬时液相扩散焊接头组织性能研究[J].稀有金属材料与工程,,().[Wei Li, Yao Jian, Zhang Jianting, Sun Haohua, Li Yanqing, Xiao Lei. Research on the Microstructure and Properties of the Transient Liquid Phase Bonding Joints of DD5 Single Crystal Alloy[J]. Rare Metal Materials and Engineering,,().]
DOI:10.12442/j. issn.1002-185X.20230798

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  • 收稿日期:2023-12-08
  • 最后修改日期:2024-01-18
  • 录用日期:2024-02-01
  • 在线发布日期: 2024-03-22
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