| 摘要: |
| 针对深井钻机刹车盘的工况条件，采用激光熔覆技术在35CrMo钢表面分别制备Fe基涂层和含Cr3C2的Fe基合金复合涂层，研究了2种涂层的组织结构、显微硬度及耐干滑动摩擦磨损性能。结果表明，Fe基涂层以亚共晶方式结晶，在初生柱状固溶体枝晶间存在大量网状共晶组织，主要由γ–Fe、Cr7C3及少量的Cr–Fe固溶体等组成。Fe基复合涂层中Cr3C2大部分溶解，枝晶凝固特征保持不变，枝晶组织明显细化，主要由γ–Fe、Cr7C3及少量的Cr–Fe固溶体及较少量未熔的Cr3C2等组成。Fe基复合涂层的显微硬度及其摩擦磨损性能优于Fe基涂层。 |
| 关键词: 激光熔覆 Fe基合金 显微组织 摩擦磨损 |
| DOI： |
| 分类号: |
| 基金项目:国家"863"项目? |
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| Microstructure and Friction and Wear Properties of Laser Cladding Fe-based Alloy Coatings on Brake Disc of Deep-well Drilling Rig |
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LU Ping–ping, WANG Yong, HAN Bin, YANG Hao
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College of Mechanical & Electronic Engineering, China University of Petroleum, Dongying Shandong 257061
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| Abstract: |
| According to technological condition of brake disc of deep–well drilling rig, laser cladding Fe–based alloy coating and Fe–based alloy composite coating with Cr3C2 particles on 35CrMo substrate were obtained. The microstructure, micro–hardness and sliding wear resistance of the coatings were studied. The results show that the Fe-based coatings are solidified in hypo–eutectic way, and network eutectic structure existed in the primary dendrite solid solution. The main phases of Fe coating were γ–Fe、Cr7C3 and Cr–Fe solid solution. Most of Cr3C2 particles in Fe-based composite coating are mostly dissolved. The basic solidifying characteristic of Cr3C2/Fe is nearly unchanged. The dendrite of the composite coatings became to be finer. The phases of Cr3C2/Fe composite coatings were composed of γ–Fe、Cr7C3、Cr–Fe solid solution and Cr3C2. The micro–hardness and friction and wear properties of Cr3C2/Fe composite coating were obviously better than that of Fe coatings. |
| Key words: Cr3C2 laser cladding Fe-based alloy Cr3C2 microstructure friction and wear |
