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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure of Vacuum-Brazed Joints of Super-Ni/NiCr Laminated Composite Using Nickel-Based Amorphous Filler Metal
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Microstructure of Vacuum-Brazed Joints of Super-Ni/NiCr Laminated Composite Using Nickel-Based Amorphous Filler Metal

机译：镍基非晶态填充金属对超Ni / NiCr叠层复合材料真空钎焊接头的组织

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摘要

Vacuum brazing of super-Ni/NiCr laminated composite and Cr18-Ni8 stainless steel was carried out using Ni-Cr-Si-B amorphous filler metal at 1060, 1080, and 1100℃, respectively. Microstructure and phase constitution were investigated by means of optical and scanning electron microscopy, energy-dispersive spectroscopy, x-ray diffraction, and micro-hardness tester. When brazed at 1060-1080℃, the brazed region can be divided into two distinct zones: isothermally solidified zone (ISZ) consisting of γ-Ni solid solution and athermally solidified zone (ASZ) consisting of Cr-rich borides. Micro-hardness of the Cr-rich borides formed in the ASZ was as high as 809 HV_(50 g). ASZ decreased with increase of the brazing temperature. Isothermal solidification occurred sufficiently at 1100℃ and an excellent joint composed of γ-Ni solid solution formed. The segregation of boron from ISZ to residual liquid phase is the reason of Cr-rich borides formed in ASZ. The formation of secondary precipitates in diffusion-affected zone is mainly controlled by diffusion of B.
机译：使用Ni-Cr-Si-B非晶态填充金属分别在1060、1080和1100℃下对Super-Ni / NiCr层压复合材料和Cr18-Ni8不锈钢进行真空钎焊。通过光学和扫描电子显微镜，能量分散光谱，x射线衍射和显微硬度测试仪研究了显微组织和相组成。在1060-1080℃下钎焊时，钎焊区域可分为两个不同的区域：由γ-Ni固溶体组成的等温凝固区（ISZ）和由富铬硼化物组成的非热凝固区（ASZ）。在ASZ中形成的富铬硼化物的显微硬度高达809 HV_（50 g）。 ASZ随着钎焊温度的升高而降低。等温凝固在1100℃下充分发生，形成了由γ-Ni固溶体组成的优良接头。硼从ISZ偏析到残留液相是ASZ中形成富铬硼化物的原因。扩散影响区次生沉淀的形成主要受B扩散的控制。

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