稀土Ce对HMn64-8-5-1.5合金组织及耐磨性能的影响

Effect of rare earth Ce on microstructure and wear resistance of HMn64-8-5-1.5 alloy

摘要:

本文系统地研究了稀土Ce对HMn64-8-5-1.5合金显微组织及摩擦磨损性能的影响。研究表明,稀土Ce在熔炼过程中起到脱氧、脱硫、除氢和除杂的作用,可以净化合金基体,使晶粒尺寸显著细化。摩擦磨损实验表明,稀土Ce能明显改善材料的摩擦磨损性能,添加0.2wt%Ce时,较无Ce的合金磨损量减小了25%。添加0.2wt%Ce后,合金的主要磨损形式从严重的黏着磨损转变为磨粒磨损。结合两种摩擦磨损模型对合金的磨损机理进行了深入分析,添加稀土Ce前后合金的磨损机制发生变化的主要原因是Ce的去除杂质、细化晶粒的作用,使合金本身的表面强度、极限变形值增大。

关键词:黄铜;稀土;显微组织;耐磨性能;磨损机理

Abstract:

The effect of rare earth Ce on microstructure and friction and wear properties of HMn64-8-5-1.5 alloy was systematically studied. The results indicate that rare earth Ce plays the role of deoxidation, desulfurization, dehydrogenation and impurity removal during the smelting process, which can purify the alloy matrix and make the grain size remarkably refined. The friction and wear experiments show that the rare earth Ce can significantly improve the friction and wear properties of the material. When 0.2wt% Ce is added, the weight loss of the alloy is less than 25%. The wear mechanism of the alloy is analyzed by combining two kinds of friction and wear models. The major wear behavior of the alloy changes from adhesive wear to abrasive wear by adding 0.2 wt% Ce. The main reason for the change of wear mechanism of the alloy with and without the Ce addition is the effects of removing impurities and refining crystal grains by Ce, which increases the surface strength and ultimate deformation value of the alloy itself.

Key words:brass; rare earth; microstructure; wear resistance; wear mechanism