无铅铋磷黄铜的结构和性能

Microstructure and Property of Lead-free Bismuth Phosphorus Brass

通过添加磷和铋代替铅黄铜中的铅制得一种新的环保易切削黄铜。观察其组织结构,研究其力学性能和切削性能,结果表明,铋以脆且低硬度的化合物分布于晶界,磷和铜形成脆性的共晶组织,它们有利于提高合金的切削性能。研制合金的抗拉强度、延伸率、断面收缩率分别是248.5 MPa、8.5%、8.67%。该合金的切屑和HPb59-1相当,形状为C型屑。

By substituting P and Bi for Pb into the brass HPb59-1,a new environmental protective and free-cutting brass was obtained. Through observing itS microstructure, study its mechanics properties and cutting properties, the results show that Bismuth is distributed in grain boundary in the form of brittle and low hardness compound and phosphorus form the brittle eutectic structure with copper. They are helpful for improving cutting property of alloy. The tensile strength, elongation, reduction of area for developed alloy are 248.5MPa、8.5% ,8.67% respectively. Cutting of the alloy corresponds to HPb59-1 with C-shape chip.