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首页> 外文期刊>Journal of manufacturing processes >Interfacial microstructure and properties of Al_2O_3/K-52 austenitic stainless-steel-brazed joints based on the Ni-45Ti filler alloy
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Interfacial microstructure and properties of Al_2O_3/K-52 austenitic stainless-steel-brazed joints based on the Ni-45Ti filler alloy

机译：Interfacial microstructure and properties of Al_2O_3/K-52 austenitic stainless-steel-brazed joints based on the Ni-45Ti filler alloy

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摘要

In this study, Al2O3 workpieces and K-52 austenitic stainless steel (K-52 ASS) were brazed in vacuum by using the Ni-45Ti filler alloy. The typical interfacial microstructure of Al2O3/K-52 ASS and K-52 ASS/K-52 ASS joints brazed at 1350 degrees C for 30 min and the bonding properties of the brazed joints were investigated. The featured interfacial microstructure of Al2O3/K-52 ASS-brazed joints bonded at 1350 degrees C for 30 min comprised Al2O3, TiC layer, Cr7C3, gamma-FeNi (s, s), and austenite matrix phases. The mechanism of Al2O3/K-52 ASS-brazed joint formation was discussed in detail. The free atoms in K-52 ASS and NiTi solder continuously diffused towards each other during brazing, and then, with the continued brazing reaction, they infinitely dissolved to form a solid solution without a phase interface due to severe mutual diffusion. A TiC reaction layer was formed adjacent to Al2O3 at the joint interface. The joint brazed to K-52 ASS at 1300 degrees C for 30 min attained the maximum shear strength of 344 MPa, and the brittle fracture of the joint was transformed into a dimple-like ductile fracture at high temperature. The mechanical properties of the Al2O3/K-52 ASS joint were strongly related to the diffusion zone morphology.

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