时效处理对Co基合金堆焊重熔层组织和性能的影响  

The Effect of Aging Treatment on Structure and Properties of Remelted Hardface Layer of Co-based Alloy

作　　者：洪永昌[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《矿冶工程》2007年第3期72-75,共4页Mining and Metallurgical Engineering

基　　金：安徽省教育厅自然科学研究项目(2005KJ036)

摘　　要：通过金相、扫描电镜显微组织分析,显微硬度测定,高温磨损试验,对经不同工艺参数时效处理的Co基合金堆焊重熔层进行了分析研究。结果表明,堆焊重熔层组织主要是细小的等轴状枝晶γ-Co及其间分布的共晶组织;经时效处理后,主要是γ-Co基体上弥散分布着合金碳化物和骨架状的共晶组织。在时效处理时,随着时效温度的不断提高,堆焊重熔层表面硬度随之升高,在900℃时硬度达到最大值,然后急剧下降;相比较,经长时(12 h)时效处理的堆焊重熔层硬度高于经短时(6 h)时效处理。经时效处理的堆焊重熔层高温耐磨性均优于未经时效处理的堆焊重熔层,并且经短时(6 h)时效处理的堆焊重熔层的高温耐磨性好于经长时(12 h)时效处理。By means of optical microscope （OP）, scanning electron microscope （SEM）, hardness test and high temperature wear test, remelted hardface layers of Co-based alloy with different aging temperatures and time were studied. The results showed that, the remelted hardface layer was composed of fine dendrite （γ-Co） and eutectic. While aging treatments were made, the microstructure was made up of the framework-like eutectic and the matrix （γ-Co） distributed with carbide. The hardness increased steadily, which reached the maximum at temperature of 900℃, and then decreased rapidly with aging temperature enhanced. The hardness values of the remelted hardface layers with longer time＇s （ 12 h） aging treatment was higher than that with shorter time （6 h）. The test of high temperature wear showed that, after aging treatment, the wear resistance was better than that as remelted. And the wear resistance of remehed hardface layer with aging short time （6 h） is better than that with longer aging time （12 h）.

关 键 词：时效 CO基合金 堆焊重熔层 组织 性能 

分 类 号：TG456.7[金属学及工艺—焊接]