(1.沈陽(yáng)工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，沈陽(yáng) 110178；2. 遼陽(yáng)技師學(xué)院 機(jī)械系，遼陽(yáng) 111000)
摘 要: 采用熱噴焊工藝在20號(hào)鋼基體上制備F102及含0.5%Ce的F102鎳基自熔合金涂層，通過(guò)組織分析和性能測(cè)試，研究Ce對(duì)F102合金的變質(zhì)作用及機(jī)理。 結(jié)果表明：兩種合金涂層均由γ-Ni、Ni3B、CrB、Ni3Si、(Cr, Fe)23C6和(Cr, Fe)7C3相組成，在連續(xù)γ-Ni基體上彌散分布棒狀CrB、粒狀(Cr, Fe)7C3、小球狀Ni3Si及枝狀混合共晶化合物，但Ce使組織明顯細(xì)化。該合金與20號(hào)鋼相比，其硬度和耐磨性分別提高3.8倍和3.2倍；與F102合金相比，其硬度和耐磨性分別提高14.8%和18%，同時(shí)該合金的耐蝕性明顯增強(qiáng)。其原因是Ce富集于液固界面，降低Fe-Cr-C共晶轉(zhuǎn)變溫度，細(xì)化合金顯微組織。合金中的Ce參與Fe-Cr-C系統(tǒng)反應(yīng)，是改變共晶轉(zhuǎn)變溫度的主要原因。
關(guān)鍵字: 鎳基自熔合金；稀土；涂層；共晶溫度；微合金化
（1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110178, China;
2. Department of Mechanical Engineering, Liaoyang Technician College, Liaoyang 111000, China）
Abstract:The coatings of F102 and F102 Ni-based self-fluxing alloy with 0.5%Ce were made on 20# steel by fire spray welding. The metamorphism and mechanism of Ce on F102 alloy were studied based on the microstructure analysis and properties testing. The results show that two kinds of alloy coatings consist of γ-Ni, Ni3B, CrB, Ni3Si, (Cr, Fe)23C6 and (Cr, Fe)7C3, the columnar CrB, granular (Cr, Fe)7C3, small spherical Ni3Si and some dendritic eutectic mixtures are well distributed in the γ-Ni matrix, but the grains in the alloy after adding Ce are much finer than before. The average hardness and wearing resistance of the alloy coating increase by 3.8 and 3.2 times, respectively, compared with those of 20# steel, and also increase by 14.8% and 18%, respectively, compared with those of F102 alloy. Moreover, the corrosion resistance performance of the alloy is increased significantly. The reason is that the element Ce enriched in the liquid-solid interface decreases the eutectic transforming temperature, thus the microtructure of the alloy are refined. The element Ce existing in the alloy participates in the reaction of Fe-Cr-C system, which is the main reason why the eutectic transforming temperature is changed.
Key words: Ni-based self-fluxing alloy; rare earths; coating; eutectic temperature; micro alloying
