添加元素Cu、Mo对镍基合金喷焊层组织和性能的影响

选择两种(Ni-A、Ni-B)成分不同的Ni基合金粉末,在STB A22钢基体上用火焰喷焊技术制备两种喷焊层. XRD和SEM背散射电子实验结果表明,喷焊层内的基体都是Ni和Ni3Fe相,其中Ni-A的基体中含有少量Cu. 在Ni-A、Ni-B的喷焊层内分布有大量富Cr硬质第二相,在Ni-A的喷焊层中,该相有两种形态,且含有较多Mo元素. 在Ni-B的喷焊层中,第二相分布均匀,且无Mo元素. 高温硬度实验表明,由于喷焊层中形成了富Cr硬质第二相,Ni-A、Ni-B喷焊层的硬度较高,而由于Ni-A第二相中含有较多Mo元素,Ni-A的高温硬度比Ni-B高,两种喷焊层的高温硬度均比基材常温时高70%以上.

Effect of Cu and Mo on the microstructure and properties of Ni-based alloy spray welding coatings

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.