Effect of Al and Nd on microstructure and properties of nickel-based cladding layer on Cr12MoV steel surface
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摘要: 为了解决Cr12MoV钢溶蚀、表面碎裂等问题，利用Al-Ni、Nd-Ni粉末在Cr12MoV钢上进行激光熔覆实验，研究了Al、Nd对镍基覆层的宏微观形貌、组织及表面性能的影响。结果表明：Al可以减少熔覆层裂纹的产生，同时降低覆层硬度，使熔覆层中产生具有减磨作用的硬质相Al2O3等，降低覆层磨损量，14%Al覆层磨损量比2%Al的覆层磨损量低44.5%，Al较优质量分数为14%；Nd的晶粒细化作用明显，显著提升覆层显微硬度，2.5%Nd覆层平均硬度比基体平均硬度高36.8%，Nd较优质量分数为2.5%。Abstract: To solve the problems of dissolution and surface fragmentation of Cr12MoV steel, laser cladding experiments were carried out on Cr12MoV steel using Al-Ni and Nd-Ni powders. The effects of Al and Nd on the macro and micro morphology, microstructure and surface properties of nickel base cladding were studied. The results show that Al can reduce the crack generation of cladding layer and reduce the hardness of cladding layer, so that the hard phase Al2O3 with anti-wear effect is generated in cladding layer, and the wear amount of cladding layer is reduced. The wear amount of 14% Al cladding layer is 44.5% lower than that of 2% Al cladding layer, and the optimal Al content is 14%. The grain refinement effect of Nd is obvious, and the microhardness of the coating is significantly increased. The average hardness of the coating is 36.8% higher than that of the substrate, and the optimal content of Nd is 2.5%.
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Key words:
- laser cladding /
- remanufacturing /
- process parameters /
- microhardness /
- dilution rate
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图 1 不同Al质量分数熔覆层宏观形貌图
Figure 1. Macro topography of the coatings with different Al mass fraction
图 3 不同Al含量熔覆层显微硬度沿层深的分布曲线
Figure 3. Distribution curve of microhardness along the depth of the coating with different Al supplemental levels
图 5 不同Al含量熔覆层摩擦因数及磨损量图
Figure 5. Plot of friction coefficient and wear value of cladding layer
图 6 不同Al含量熔覆层磨损表面形貌图
Figure 6. Worn surface morphology of coatings with different mass fraction of Al addition
图 7 不同Nd含量熔覆层宏观形貌图
Figure 7. Macro topography of the coatings with different Al addition
图 8 不同Nd含量熔覆层SEM形貌和XRD谱
Figure 8. SEM morphology and XRD spectra of coatings with different Nd additions
图 9 不同Nd含量熔覆层硬度沿层深的分布曲线
Figure 9. Hardness distribution curve of laser cladding samples with different Nd addition levels along the layer depth
图 10 不同Nd含量熔覆层摩擦因数及磨损率
Figure 10. Friction coefficient and wear rate of cladding layer
图 11 不同Nd含量熔覆层磨损表面形貌图
Figure 11. Worn surface morphology of coatings with different mass fraction of Nd addition
表 1 Cr12MoV钢化学成分
Table 1. Toughening chemical composition of Cr12MoV
composition mass fraction/% C 0.15 V 0.50 Si 0.25 Mo 0.30 Cr 11 Mn 0.55 Fe The rest 
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表 2 NFZCr-4镍基合金粉末化学成分(%)
Table 2. Chemical composition of NFZCR-4 Ni-base alloy powder (%)
composition mass fraction/% Si 3 B 3 Cr 18 Fe 4 C 0.6 Ni The rest
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