BCo-1钎料钎焊不同间隙K417G合金的接头组织和力学性能

Microstructure and mechanical properties of K417G alloy joints using BCo-1filler with various gap widths

摘要

K417G合金广泛应用于航空发动机涡轮叶片制造，针对叶片长期服役后产生的裂纹等损伤，常采用钎焊方法进行修复。分别设计0.05 mm和0.2 mm（0.2 mm间隙内预置高温合金粉末）两种间隙K417G合金模拟不同宽度裂纹形式，采用BCo-1钴基钎料在1160 ℃不同保温时间条件下开展真空钎焊实验研究，通过扫描电子显微镜对接头微观组织和界面演变规律进行分析，并利用万能试验机测试接头高温拉伸性能。结果表明，BCo-1钎料可实现K417G合金的良好冶金连接，接头区域未见气孔、未焊合等缺陷，接头物相主要包括γ+γ′相，（Cr，Mo）₃B₂硼化物和（Ni，Co）₅Si₃硅化物等。随着保温时间的延长，0.05 mm小间隙接头内化合物相的形态分布发生明显变化，化合物相含量呈现先增加后减少趋势；0.2 mm大间隙接头内高温合金粉末颗粒和化合物相逐渐粗化长大。保温时间对0.05 mm小间隙接头的高温性能影响较小，接头950 ℃平均抗拉强度为298 MPa；但延长保温时间会导致0.2 mm大间隙接头的性能下降，1160 ℃保温15 min性能最佳，950 ℃平均抗拉强度达到460 MPa。

Abstract

K417G alloy finds extensive application in the fabrication of aero-engine turbine blades. To tackle damage，such as cracks that emerge after prolonged service，brazing is a commonly adopted repair method. In this research，two gap sizes，namely 0.05 mm and 0.2 mm，are deliberately designed to mimic cracks of varying widths in the K417G alloy. Vacuum brazing experiments are carried out using BCo-1 cobalt-based filler metal at 1160 ℃ with different holding times. The microstructure and interfacial evolution of the joints are thoroughly analyzed via scanning electron microscopy，and their high-temperature tensile properties are tested on universal testing machine. The results reveal that the BCo-1 filler metal can establish a high-quality metallurgical bond with the K417G alloy. No defects，including pores or unbonded area，are detected in the joint area. The joint phases primarily comprise γ + γ′ phases，Cr-Mo-rich boride phase，and silicide phases. As the holding time is extended，the morphology of the compound phases in the 0.05 mm narrow-gap joint undergoes significant changes，and their content exhibits a trend of initially increasing and then decreasing. In the 0.2 mm wide-gap joint，the superalloy powder particles and compound phases gradually coarsen. The holding time has a relatively minor impact on the high-temperature performance of the 0.05 mm narrow-gap joint，which demonstrates tensile strength of 298 MPa at 950 ℃. In contrast，an extended holding time leads to deterioration in the performance of the 0.2 mm wide-gap joint. The optimal properties，with tensile strength of 460 MPa at 950 ℃，are achieved under the parameter set of 1160 ℃ for 15 min holding time.

关键词

K417G合金 / 钎焊间隙 / 保温时间 / 微观组织 / 高温性能

Key words

K417G alloy / brazing gap / holding time / microstructure / high-temperature properties

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基金资助

国家自然科学基金(52201050)