(華北水利水電學(xué)院 機械學(xué)院，鄭州 450011)
摘 要: 采用新型電火花設(shè)備在鑄鋼表面制備了YG8涂層，采用SEM、XRD技術(shù)研究其微觀組織和耐磨性能。結(jié)果表明：沉積層主要由Co3W3C、Fe3W3C、Fe3Mo3C、WC1−x和Fe7W6C等相組成；沉積層與基體冶金結(jié)合，細晶碳化物相彌散分布在沉積層中，能提高沉積層的硬度，平均硬度為1 896.8HV，比基體硬度提高了5倍；沉積層磨損性能是基體的3.4倍，沉積層磨損機理主要是粘著磨損、顆粒磨損和氧化磨損的綜合作用；沉積時驟熱驟冷過程中形成的細晶粒硬質(zhì)相是提高沉積層硬度和耐磨性的主要因素。
關(guān)鍵字: 鑄鋼0Cr13Ni5Mo；電火花沉積；YG8沉積層；顯微組織；耐磨性
（School of Mechanical Engineering, North China University of Water Resource and Electric Power,
Zhengzhou 450011, China）
Abstract:The YG8 electrode coating was deposited on surface of 0Cr13Ni5Mo cast steel by electro-spark deposition (ESD). The microstructure, micro-hardness and wear resistance of the coating were investigated by SEM and XRD. The results show that the coating consists of Co3W3C, Fe3W3C, Fe3Mo3C, WC1−x and Fe7W6C phases, and is bonded metallurgically with that of the 0Cr13Ni5Mo cast steel substrate. The fine-structure grain carbide phases dispersed in the deposited layer increase the micro-hardness，and the average hardness is 1 896.8HV, which is about 5 times higher than that of the 0Cr13Ni5Mo cast steel substrate. The coating improves the wear resistance performance, and the average wear resistance rate is 3.4 times of that of the 0Cr13Ni5Mo cast steel substrate. The wear mechanism is mainly adhesion wear, abrasive wear and oxidization wear. The fine-structure hard phases formed under the condition of fast thermal and rapid cool are the main factors leading to the high hardness and wear resistance of the coating.
Key words: 0Cr13Ni5Mo cast steel; electro-spark deposition (ESD); YG8 coating; microstructure; wear resistance
