W_xC增强镍基合金等离子堆焊层组织与空蚀性能

发布时间：2018-03-09 05:17

本文选题：等离子堆焊　切入点：镍基合金　出处：《焊接学报》2017年04期 　论文类型：期刊论文

【摘要】：采用等离子堆焊技术在316L不锈钢表面原位合成W_xC增强镍基复合材料涂层,对涂层显微组织、相组成、硬质增强相的分布、显微硬度以及空蚀性能进行了分析.结果表明,Colmonoy 88合金等离子堆焊成形性良好,组织致密;堆焊层组织主要由γ-Ni固溶体,原位合成多角形、颗粒状W_xC及少量的Cr7C3,Fe3W3C,Cr B2相组成.堆焊过程中,熔池温度低于1 655 K时,原位生成WC和W2C,温度高于1 655 K时,原位生成的WC发生了分解.镍基合金堆焊层平均硬度可达1 619 HV,为基材的8倍以上,在3.5%Na Cl溶液中镍基复合材料抗空蚀性能为316L不锈钢基材的5倍.
[Abstract]:Plasma surfacing technology was used to fabricate in situ WashixC reinforced nickel matrix composite coating on 316L stainless steel surface. The microstructure, phase composition and distribution of hard reinforcement phase of the coating were investigated. The microhardness and cavitation corrosion properties were analyzed. The results showed that the plasma surfacing welding of Colmonoy 88 alloy had good formability and compact microstructure, the microstructure of the surfacing layer was mainly composed of 纬 -Ni solid solution, and the polygonal shape was synthesized in situ. The composition of granular WXC and a small amount of Cr7C3Fe3W3CnCrB2 phase. During surfacing welding, WC and W2C were formed in situ when the weld pool temperature was lower than 1 655 K, and the temperature was higher than 1 655 K. The average hardness of the Ni base alloy surfacing layer is 1 619 HVV, which is more than 8 times of that of the substrate, and the cavitation corrosion resistance of the nickel matrix composite in 3.5 NaCl solution is 5 times that of the 316L stainless steel substrate.
【作者单位】：沈阳工业大学材料科学与工程学院;沈阳鼓风机集团核电泵业有限公司;沈阳真空技术研究所;
【基金】：国家重点研发计划资助项目(2016YFB1100204,2013ZX06002-002) 国家自然科学基金资助项目(51271126) 沈阳市科技计划资助项目(F16-032-0-00)
【分类号】：TG455

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