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首页> 外文期刊>Key engineering materials >Effect of Mixing Ratio on Mechanical Properties of Wide-gap Brazed Ni-based Superalloy with Ni-Si-B Alloy Powder
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Effect of Mixing Ratio on Mechanical Properties of Wide-gap Brazed Ni-based Superalloy with Ni-Si-B Alloy Powder

机译：Effect of Mixing Ratio on Mechanical Properties of Wide-gap Brazed Ni-based Superalloy with Ni-Si-B Alloy Powder

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摘要

This study investigated the microstructure and mechanical properties of a wide-gap region brazed with various powders mixing ratios of additive powder to filler metal powder. The IN738 and BNi-3 alloy powders were used as additive and filler metal powder for the brazing process. The wide-gap brazing process was carried out in a vacuum of 2x10~(-5) torr. It was observed that the region brazed with only filler metal had a microstructure consisting of fully eutectic and dendrite structures. However, the region brazed with 60wt IN738 additive powder consisted of IN738 additive, Ni_3B-Ni eutectic and (Cr, W)B. The fracture strength of the wide-gap region (70 wt. additive and 30 wt. filler metal powder) was as high as 687 MPa at room temperature. The Cracks in the wide-gap brazed region initiated at the Ni_3B-Ni eutectic and (Cr, W)B, and then propagated through them. It was found that the Ni_3B-Ni eutectic and (Cr, W)B in the brazed region are important microstructural factors affecting the mechanical properties of the wide-gap brazed region.

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