Effect of vacuum heat treatment on microstructure and hardness of BCu35NiMnCoSi copper based filler metal

doi:10.13251/j.issn.0254-6051.2023.05.029

Abstract

Abstract: Vacuum heat treatment of BCu35NiMnCoSi copper based filler metal was carried out by different processes, and the effect of vacuum heat treatment on the microstructure and properties was studied by comparing with the traditional air furnace heat treatment process. The results show that the microstructure and hardness of the BCu35NiMnCoSi filler metal after vacuum heat treatment are basically the same as that of traditional air furnace treatment. The vacuum heat treatment process has no effect on the chemical composition of the BCu35NiMnCoSi filler metal, and the surface dilution of some elements is caused by the dilution of raw materials. With the increase of heating temperature and holding time, the microhardness of the filler metal decreases. The ranges of optimized vacuum heat treatment process parameters of the BCu35NiMnCoSi filler metal are from 870 ℃ to 880 ℃, 15 min to 25 min and 890 ℃, 15 min to 20 min. With these parameters to vacuum heat treating the BCu35NiMnCoSi filler metal bar, the brazed stainless steel pipe weld has no defects such as filler metal nodule, pore, burn through and matrix melting erosion, and the welded pipe has good air tightness and meets the usage requirements.

Key words: BCu35NiMnCoSi filler metal, vacuum heat treatment, microstructure, microhardness, chemical composition

CLC Number:

TG156.1

Zhao Dong, Dong Zhi, Quan Chunyi, Hu Fuchang, Li Shijian. Effect of vacuum heat treatment on microstructure and hardness of BCu35NiMnCoSi copper based filler metal[J]. Heat Treatment of Metals, 2023, 48(5): 191-195.

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