铌元素含量对等离子堆焊镍基合金的影响
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摘要
采用添加了5种不同比例Nb粉的镍基复合合金粉末,通过等离子堆焊技术在304L上进行堆焊,并对堆焊层的显微组织、元素分布和显微硬度进行对比分析。结果表明,堆焊层组织主要由γ-Ni树枝晶、枝晶间的共晶组织、Cr的硼化物、弥散分布的NbC颗粒等相组成。当Nb粉含量为5wt%时硬度值最高,相比于纯镍基合金堆焊层显微硬度提高了约40%。
The Ni-based composite alloy powders with 5 different proportions of Nb powder were used for surfacing on304 L steel plate by plasma surfacing technique. The microstructure, elemental distribution and microhardness of the surfacing layer were compared and analyzed. The results show that the surfacing layer mainly consists of γ-Ni dendrites, eutectic microstructure between dendrites, chromium boride, dispersed NbC particles, etc. The hardness value is the highest when the content of Nb powder is 5 wt%, which is about 40% higher than that of pure Ni-based alloy surfacing layer.
The Ni-based composite alloy powders with 5 different proportions of Nb powder were used for surfacing on304 L steel plate by plasma surfacing technique. The microstructure, elemental distribution and microhardness of the surfacing layer were compared and analyzed. The results show that the surfacing layer mainly consists of γ-Ni dendrites, eutectic microstructure between dendrites, chromium boride, dispersed NbC particles, etc. The hardness value is the highest when the content of Nb powder is 5 wt%, which is about 40% higher than that of pure Ni-based alloy surfacing layer.
引文
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[3] Cheng J B, Xu B S, Liang X B,et al. Microstructure and mechanical characteristics of iron-based coating prepared by plasma transferred arc cladding process[J]. Materials Science and Engineering A, 2008,492(1/2):407-412.
[4] Tigrinho J J,d'Oliveira A S C M. Plasma transferred arc surface modification of a low carbon steel[J]. Journal of Materials Science, 2007,42(17):7554-7557.
[5]傅卫,王惜宝,陈国喜.镍基WC等离子弧熔敷层的组织和高温磨损性能[J].焊接学报,2009,30(5):65-68.
[6] Tjong S C,Ma Z Y. Microstructural and mechanical characteristics of in situ metal matrix composites[J]. Materials Science and Engineering R:Resport,2000,29(3/4):49-113.
[7]武晓雷,陈光南.激光形成原位TiC颗粒增强涂层的组织及性能[J].金属学报,1998,34(12):1284-1288.
[8] Cui C Y, Guo Z X, Wang H Y,et al. In situ TiC particles reinforced grey cast iron composite fabricated by laser cladding of Ni-Ti-C system[J]. Journal of Materials Processing Technology,2007,183(2/3):380-385.
[9]蒋建敏,夏立明,贺定勇,等.铌含量对Fe-Cr-C熔敷金属组织与性能的影响[J].中国表面工程,2009,22(5):62-65.
[10] Dong G, Yan B, Deng Q L,et al. Microstructure and wear resistance of in situ Nb C particles reinforced Ni-based alloy composite coating by laser cladding[J]. Journal of Wuhan University of Technology-Materials Science Edition, 2012,27(2):231-237.