细WC配比对非均匀YG20C合金性能的影响  

Effect of the Matching of Fine WC Powders on the Properties of Non-homogeneous YG20C Cemented Carbides

作　　者：沈志农[1] 杨立[2] 

机构地区：[1]湖南工业大学冶金工程学院,湖南株洲412007 [2]湖南铁道职业技术学院,湖南株洲412000

出　　处：《硬质合金》2011年第3期163-165,176,共4页Cemented Carbides

摘　　要：研究了碳化钨粗颗细粒搭配对YG20C合金的力学性能与组织结构的影响,即在WC颗粒平均粒径为25μm的合金中,加入不同比例的平均粒径为2.0μm的WC颗粒,构成非均匀晶粒硬质合金。结果表明,非均匀YG20C合金的硬度和抗弯强度随着细晶粒碳化钨含量的增加都是先升高再降低。当细颗粒碳化钨比例为20%(文中含量均为质量分数)时,YG20C合金的综合力学性能最好,硬度和抗弯强度都达到"双高",其值分别为HRA83.5和2 800 MPa,比均匀YG20C合金的硬度和抗弯强度分别提高HRA1.2和400 MPa。并且非均匀YG20C合金的冲压使用效果最佳。The influence of the matching of fine WC powders on the mechanical properties and microstructures of YG20C cemented carbide has been studied in the paper.The non-homogeneous alloy was made up of coarse WC powders with an average particle size of 25 μm and different proportion of fine WC powders with an average particle size of 2.0 μm.The results show that the contents of fine WC powders have great influence on the properties of YG20C cemented carbides.In the fine WC powder content scope of this research,the hardness and transverse strength of the alloys both firstly increase then decrease with the increase of fine WC powder content and appear maximum values at 20% for fine WC powders.The best content is 20%,the alloys appear the hardness and transverse strength of 83.5 HRA and 2 800 MPa,respectively.The hardness and transverse strength are 1.2 HRA and 400 MPa higher than those of homogeneous YG20C cemented carbides,respectively.The resultant cemented carbide has been proved to be successful in cold-punch-ing mould experiment.

关 键 词：YG20C合金 力学性能 显微组织 

分 类 号：TG135.5[一般工业技术—材料科学与工程]