摘要
采用粉末渗硼法对电渣熔铸钢结硬质合金进行渗硼处理,利用光学显微镜对所获渗硼层的显微组织结构进行观察,用X射线衍射仪对渗硼层相结构进行分析,用显微硬度计对渗硼层硬度分布及渗硼层厚度进行了测量,研究了不同处理时间对硼化物生长的影响。结果表明:电渣熔铸钢结硬质合金具有良好的渗硼性能,渗硼后,合金表面可获得含有FeB+Fe2B的高硬度渗硼层,且随渗硼处理的时间延长,渗硼层厚度和表面硬度也随之增加,FeB含量也增加,在渗硼过程中,WC颗粒对硼化物的生长起阻碍作用,并且含量愈多,阻碍作用就愈明显,WC的形态对硼化物的生长影响较大,块状和树枝状的WC使渗硼后所获得的渗硼层浅而疏松。
The electro-slag melting and casting steel-berried carbides have been boronized by the powder boronizing. The microstructure and the distribution of hardness value as well as the thickness of beronized layer have been investigated by optics micrography, X-ray diffraction and microhardness tester, etc. Furthermore, influence of the botanizing time on growing of berids is highly analyzed. The results show that steel-bonded carbides have good boronizing properties. After botanizing, the botanized layer consisting of FeB and Fe2B with high hardness has been formed on the surface of sample, the quantity of FeB and thickness of bomnzing layer increase as bemnzing time gets longer. During the botanizing process, the WC particles play a role in hindering the growth of boride. The more the contents of WC particles are, the greater the hindering effect is. The WC shapes effect the growth of boride, massive and dendritic WC cause boronized layer thin and loose.
出处
《硬质合金》
CAS
北大核心
2007年第3期140-143,共4页
Cemented Carbides
基金
安徽省教育厅重点资助项目(2006KG083A)
