废杂铜再生铜材的显微组织和性能研究

Research on Microstructures and Properties of Copper from Regenerated Scraps

研究了废杂铜再生铅黄铜的显微组织和切削性能。结果表明当合金中含0.53 wt%-0.73wt%Al而Fe从0.50wt%增大到0.71wt%时,富铁相体积分数从0.83%提高到1.87%,尺寸由4.0μm增到16.7μm。当46.23%-46.35%锌当量、0.61 wt%-0.70wt%Fe、0.71 wt%-0.73wt%Al时,合金的切削性能最差;水平连铸二次冷却到623 K时,α相细化为杆状,合金切削性能进一步下降。当富Fe相大于0.85%时,它先于茁相凝固;当富Fe相小于0.62%时,它在茁相前沿凝固。当锌当量控制在43.33%-45.15%、富铁相尺寸0.6-5.1μm和体积分数为0.20%-0.61%时,废铜再生铅黄铜的切削性能大幅度改善。

The microstructures and machinability of lead brass from regenerated scraps were studied. The results show that as Al is 0.53wt%-0.73wt%, and Fe increases from 0.50wt% to 0.75wt%, the iron-rich phase size increases from 4.0 μm to 16.7 μm, and the phase volume fraction enhances from 0.83% to 1.87%. When zinc-equivalent content of 46.23%-46.35%, 0.61wt%-0.70wt% Fe, and 0.71wt%-0.73wt% Al, the cutting performance of the alloys is the worst. When the secondary cooling of horizontal continuous casting reaches to 623K, a phase refinement becomes a rod-shaped, and the cutting performance of the alloy decreases further. When iron-rich phase is above 0.85%, it precedes the β phase solidification; when iron-rich phase is less than 0.62%, its solidification is in the front of 13 phase. When the Zinc-equivalent content is 43.33%- 45.15%, and the size and volume of the iron-rich phase is 0.6-5.1 μm and 0.20%-0.61% respectively, the cutting performance of the regenerated copper brass from scraps is greatly improved.