CAJ | 학술논문

采用新型电火花沉积设备，将亚微米WC-4Co陶瓷硬质合金材料沉积在铸钢材料上，制备电火花沉积合金涂层，利用SEM和XRD等技术研究沉积层与基体间的界面行为，分析沉积层的表面润湿性、物相形成机理、微观组织结构、界面元素分布、界面结合机理和显微硬度变化等。结果表明：电火花沉积技术可以在金属基体表面制造出微纳米非晶高熔点强化层。铸钢表面沉积层主要由Fe3W3C、Co3W3C、Si2W和Fe2C 等相组成；沉积层与基体呈冶金结合，过渡层中出现一些柱状晶和等轴晶的组织结构，沉积层中细小的Fe2C和Si2W等硬质相颗粒弥散分布于Fe 3 W 3 C和Co 3 W 3 C沉积层上。沉积层的厚度大于20μm，沉积层的平均显微硬度为1803.2 HV，细小弥散分布的硬质相是沉积层硬度提高的主要因素。
채용신형전화화침적설비，장아미미WC-4Co도자경질합금재료침적재주강재료상，제비전화화침적합금도층，이용SEM화XRD등기술연구침적층여기체간적계면행위，분석침적층적표면윤습성、물상형성궤리、미관조직결구、계면원소분포、계면결합궤리화현미경도변화등。결과표명：전화화침적기술가이재금속기체표면제조출미납미비정고용점강화층。주강표면침적층주요유Fe3W3C、Co3W3C、Si2W화Fe2C 등상조성；침적층여기체정야금결합，과도층중출현일사주상정화등축정적조직결구，침적층중세소적Fe2C화Si2W등경질상과립미산분포우Fe 3 W 3 C화Co 3 W 3 C침적층상。침적층적후도대우20μm，침적층적평균현미경도위1803.2 HV，세소미산분포적경질상시침적층경도제고적주요인소。
Submicron WC-4Co cemented carbide material was deposited on the surface of cast steel by electro-spark deposition (ESD), the electro-spark deposition coating was prepared. The behavior of interface between the coating and the substrate was studied by SEM and XRD. The surface wettability, the forming mechanism of phase, microstructure, element distribution of deposition, bonding mechanism of interface and microhardness of the coating were investigated. The results show that micro/nano and amorphous coating with high melting-point is produced on the surface of cast steel by ESD. The coating consists of Fe 3 W 3 C, Co 3 W 3 C,Si 2 W and Fe 2 C phases. The coating is well metallurgical bonded with the cast steel roll substrate. The microstructure of the transition layer is a structure of fine columnar crystals and equiaxed crystals. The extra-fine structure hard Si2W and Fe2C phases distribute dispersedly in Fe3W3C and Co3W3C deposition. The coating is usually more than 20 μm thick. The average microhardness of the coating is 1803. 2 HV. These fine and dispersed hard phases can greatly improve the hardness of coating.