摘要
利用强流脉冲电子束(HCPEB)进行YG10硬质合金表面辐照处理。通过金相显微镜、扫描电镜和X射线衍射方法分析表层显微组织演变,并测量样品表面显微硬度和磨损性能变化规律。分析表明,HCPEB辐照引发YG10样品表层快速熔凝,原始微米尺寸的WC晶粒转变为纳米细化组织,Co粘结相消失,表面产生网状微裂纹,改性层(厚度约1.5μm)中的WC逐步转化为WC_(1-x)相,同时伴随纳米碳粒子、W_2C相的析出和重新分布过程。样品表面显微硬度随脉冲次数增加呈线性提高,由原始的1735.8 Hv增加到35次脉冲的3128.5 Hv。6次脉冲处理样品的耐磨性能最佳,磨损率降为原始样品的40%,表层纳米细化组织和弥散碳粒子析出是耐磨性能改善的主要原因。
Surfaces of YG10 hard alloy were modified by high current pulsed electron beam（ HCPEB） irradiation. The impact of HCPEB irradiation cycle on the tribological properties was investigated with X-ray diffraction,scanning electron microscopy and conventional mechanical tools. The results show that HCPEB irradiation significantly improved the microstructures and mechanical behavior. In the irradiation-produced rapid melting and solidification of the surface layer,micro WC-grains turned into nano-grains,accompanied by disappearance of Co bonding phase and appearance of irregular micro-crack net-work. In the 1. 5 μm thick modified layer,phase transition from WC to WC1-x,formation and redistribution of surface segregated C nano-particles and W_2C-phased grains were observed. As the irradiation cycle increased,the micro-hardness increased from 1735. 8 to 3128. 5 Hv after 35cycles;but the wear-rate changed in a decrease-increase manner,volleying at 6 cycles,possibly because of nano-grain formation and precipitation of C-particles.
出处
《真空科学与技术学报》
CSCD
北大核心
2017年第7期709-713,共5页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金项目(51471043)
