高强度黄铜的显微组织和磨损性能

Microstructure and Wear of High－Tensile Brasses

添加了Al、Mn、Si、Fe、稀土等元素的高强度黄铜具有高耐磨性能和良好的承载性能,不仅因为材料中Al元素的加入,大大改变α相和β相的比率,还因为Mn、Fe、Si的加入, 在材料中形成显微硬度很高的硅化物颗粒,这些颗粒均匀而弥散分布于β(α＋β)基体相上,形成理想的软基体＋硬质点的耐磨组织。正确地选用合金元素,合理地设计合金成分和采用一定的热处理工艺,不仅可以改变材料中各相的比率,而且可以控制显微组织中硬质颗粒相的粒度、密度和分布,从而使材料的综合性能达到最佳状态。

High－tensile brasses containing aluminium,manganese,silicon,iron and rare earth have high wear resistance and good bearing properties. What , the volume fraction of α－phase and β－phase influenced by aluminium, the particles with high microhardness formed by manganese ,silicon,iron etc are the reasons. The particles, which form into soft matris and hard particles with high wear resistance, are homogeneousely and dispersedy distributed on the β(α＋β) parent body. If selecting the element correctly,designing the composition and using the process of heat treatment reasonably, the propostion of phases is changed, the granularity,density and dispersing of hard particles in microstructure are controled . certanily, material with excellent properties is obtained.