Reaction mechanisms and mechanical properties of SiCf/SiC composite and GH536 superalloy joints using CoFeNiCrMn high-entropy alloy filler

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Buqiu Shao , Shuai Zhao , Peng Wang , Xin Nai , Haiyan Chen , Yongsheng Liu , Pengcheng Wang , Xiaoguo Song , Wenya Li
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引用次数: 0

Abstract

To meet the service conditions and strength requirements of turbine stator blades and the inner and outer rings of aero engine casings, CoFeNiCrMn high-entropy alloy filler was used to braze SiCf/SiC/GH536 joints. This study investigated the effects of holding time on the joints' microstructure and mechanical properties. Key phases identified in the welded joints include MoNiSi, FCC, and Cr23C6 near the composites, with brittle Ni3Si and Fe2Si intermetallic compounds forming due to filler diffusion. Optimal brazing parameters were found to be 1220 °C for 30 min with a shear strength of 64.28 MPa. The study also highlighted that increased holding time at the same temperature enhances diffusion at the joint, increasing brittle intermetallic compounds, initially improving shear strength, which then declines. Microstructural and fracture morphology analyses revealed that insufficient insulation time leads to poor welding and stress concentration at pores, causing cracks. Excessive insulation time results in joint fractures due to the brittleness of Ni3Si and Fe2Si intermetallic. Thus, joint shear strength correlates with welding quality and intermetallic compound distribution.

使用 CoFeNiCrMn 高熵合金填料的 SiCf/SiC 复合材料和 GH536 超合金接头的反应机理和力学性能
为了满足涡轮定子叶片和航空发动机壳体内外环的使用条件和强度要求,CoFeNiCrMn 高熵合金填料被用于钎焊 SiCf/SiC/GH536 接头。本研究调查了保温时间对接头微观结构和机械性能的影响。在焊点中发现的主要相包括复合材料附近的 MoNiSi、FCC 和 Cr23C6,由于填料扩散形成了脆性的 Ni3Si 和 Fe2Si 金属间化合物。最佳钎焊参数为 1220 °C 30 分钟,剪切强度为 64.28 兆帕。该研究还强调,在相同温度下延长保温时间会加强接头处的扩散,增加脆性金属间化合物,最初会提高剪切强度,随后会降低。微观结构和断裂形态分析表明,保温时间不足会导致焊接不良和孔隙应力集中,从而产生裂纹。由于 Ni3Si 和 Fe2Si 金属间化合物的脆性,绝缘时间过长会导致接头断裂。因此,接头剪切强度与焊接质量和金属间化合物分布相关。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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