摘要
采用扫描电镜、表面轮廓仪、X射线衍射仪和维氏显微硬度计研究了脉冲频率对强流脉冲电子束(IPEB)辐照WC-13Ni硬质合金微观组织与硬度的影响。结果表明,在较低能量密度3 J/cm^2下,脉冲频率的增加使IPEB辐照热冲击累积作用增强,导致硬质合金表面热冲蚀坑数量与Ni相含量增加,表面粗糙度缓慢增加,硬度先下降后缓慢增加;在较高能量密度13 J/cm^2下,脉冲频率的增加使IPEB辐照热重熔累积作用增强,导致硬质合金表面烧蚀孔数量与尺寸、WC1-x和W2C相含量增加,同时表面粗糙度及硬度呈先增加后降低的变化趋势,当脉冲频率为1 Hz时,表面硬度达到最大值1 380 HV0.2。
The effect of pulsed frequency on microstructure and microhardness of WC-13 Ni cemented carbide irradiated by intense pulsed electron beam(IPEB) was investigated by scanning electron microscope,surface profiler,X-ray diffractometer and Vickers microhardness tester.The results show that at a lower energy density of 3 J/cm^2,the increase of pulse frequency enhances the cumulative effect of thermal shock of IPEB irradiation,resulting in an increase in the number of thermal erosion pits and the content of Ni phase on the surface of the cemented carbide,the surface roughness slowly increasing,and the hardness decreasing at first and then slowly increasing.At a higher energy density of 13 J/cm^2, the increase of pulse frequency enhances the cumulative effect of surface remelting of IPEB irradiation,resulting in an increase in the number and size of ablated holes and the content of WC1-x and W2C phases on the surface of the cemented carbide. At the same time,the surface roughness and microhardness increase at first and then decrease.When the pulse frequency is 1 Hz,the surface microhardness reaches the maximum of 1 380 HV0.2.
作者
张锋刚
ZHANG Feng-gang(School of Material Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2019年第5期74-78,共5页
Rare Metals and Cemented Carbides
基金
陕西省自然科学基础研究计划项目(2018JM5021)
