Effect of Cu and Mo on the microstructure and properties of Ni-based alloy spray welding coatings
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摘要: 選擇兩種(Ni-A、Ni-B)成分不同的Ni基合金粉末,在STB A22鋼基體上用火焰噴焊技術制備兩種噴焊層.XRD和SEM背散射電子實驗結果表明,噴焊層內的基體都是Ni和Ni3Fe相,其中Ni-A的基體中含有少量Cu.在Ni-A、Ni-B的噴焊層內分布有大量富Cr硬質第二相,在Ni-A的噴焊層中,該相有兩種形態,且含有較多Mo元素.在Ni-B的噴焊層中,第二相分布均勻,且無Mo元素.高溫硬度實驗表明,由于噴焊層中形成了富Cr硬質第二相,Ni-A、Ni-B噴焊層的硬度較高,而由于Ni-A第二相中含有較多Mo元素,Ni-A的高溫硬度比Ni-B高,兩種噴焊層的高溫硬度均比基材常溫時高70%以上.Abstract: Two spray coatings were prepared by thermal spray weld with two kinds of Ni-based alloy powders, named as Ni-A and Ni-B. XRD and SEM results show that the substrates of Ni-A and Ni-B spray coatings are both Ni and FeNi3, while there is few Cu in Ni-A substrate. Both in Ni-A and Ni-B coatings there are lots of secondary phases with a great proportion of Cr. Secondary phases in Ni-A have two appearances and there is about 20% Mo in them, but secondary phases in Ni-B contain no Mo. The results of high-temperature hardness test make it clear that the hardnesses of Ni-A and Ni-B are high and descend with increasing temperature. The hardness of Ni-A is higher than.the relevant hardness of Ni-B because there is about 20% Mo in the secondary phases of Ni-A.
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Key words:
- Ni-based self-fluxed alloy /
- spray welding coating /
- phase /
- microstructure /
- high temperature hardness
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