23C6的生成分布,復(fù)合涂層的硬度得到了明顯的提升,最終其硬度可達(dá)HV0.2 720。"/>

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激光熔覆原位制備ZrC增強(qiáng)涂層的顆粒行為特征
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上海交通大學(xué)機(jī)械與動(dòng)力工程學(xué)院,上海交通大學(xué)機(jī)械與動(dòng)力工程學(xué)院,哈爾濱工業(yè)大學(xué)先進(jìn)焊接與連接國(guó)家重點(diǎn)實(shí)驗(yàn)室,上海交通大學(xué)機(jī)械與動(dòng)力工程學(xué)院,上海交通大學(xué)機(jī)械與動(dòng)力工程學(xué)院

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51275303)


Behavior Characteristics of In-Situ Formed ZrC Particle Reinforcement Composite Coating by Laser Cladding
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School of Mechanical Engineering,Shanghai Jiao Tong University,School of Mechanical Engineering,Shanghai Jiao Tong University,State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,School of Mechanical Engineering,Shanghai Jiao Tong University,School of Mechanical Engineering,Shanghai Jiao Tong University

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    摘要:

    通過添加氧化鋯和石墨的混合粉末到鎳基合金粉末中,利用激光熔覆技術(shù)在中碳鋼表面上制備了原位析出ZrC顆粒增強(qiáng)金屬Ni基復(fù)合涂層。利用掃描電鏡(SEM),能譜儀(EDS)和X射線衍射設(shè)備(XRD)對(duì)涂層的組織、物相和成分進(jìn)行了觀察、分析和探討。對(duì)涂層內(nèi)部的ZrC顆粒形貌、生成以及生長(zhǎng)機(jī)理、分布特點(diǎn)進(jìn)行了分析,探討了顆粒分布對(duì)涂層硬度性能的影響。結(jié)果表明,ZrC顆粒在中上部分布較為均勻,主要以三角形和四邊類似菱形和長(zhǎng)軸形為主,顆粒在對(duì)流和界面斥力共同作用下發(fā)生的碰撞、燒結(jié)以及枝晶間的阻力是成形主因。由于ZrC顆粒以及內(nèi)部碳化物如M23C6的生成分布,復(fù)合涂層的硬度得到了明顯的提升,最終其硬度可達(dá)HV0.2 720。

    Abstract:

    Through the in-situ synthesizing the doping of zirconium dioxide and graphite, the ZrC particles reinforced NiCrBSi composite coating was produced onto the mild steel by laser cladding. Microstructure, phase constitution of NiCrBSi+Zr composite coating were characterized by scanning electron microscope(SEM), energy dispersive spectrometer(EDS) and X-ray diffractometer(XRD). And the morphology, formation and growth mechanism and distribution of ZrC reinforcements were studied and discussed, and the hardness of coating was investigated as well. The results showed that ZrC reinforcements were uniformly distributed in the upper and middle coating, only little was in the bottom of coating. The morphology of ZrC were mainly consist of triangle, quadrilateral similar to rhombus and long-bar shape, which contributes to obstruction from the interdendritic growth, the collision and sintering caused by high convection and repulsion between solid-liquid interface in the molten pool. Hardness of composite coating was improved by ZrC reinforcements and carbide such as M23C6, which contribute to its high hardness. Finally, the hardness of composite coating can reach to HV0.2 720.

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雍耀維,張翔,傅衛(wèi),鄧琦林,楊建國(guó).激光熔覆原位制備ZrC增強(qiáng)涂層的顆粒行為特征[J].稀有金屬材料與工程,2018,47(5):1625~1630.[Yong Yaowei, Zhang Xiang, Fu Wei, Deng Qilin, Yang Jianguo. Behavior Characteristics of In-Situ Formed ZrC Particle Reinforcement Composite Coating by Laser Cladding[J]. Rare Metal Materials and Engineering,2018,47(5):1625~1630.]
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  • 收稿日期:2016-05-04
  • 最后修改日期:2016-07-20
  • 錄用日期:2016-08-18
  • 在線發(fā)布日期: 2018-06-08
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