Effect of reinforcement particle size on microstructure and impact toughness of iron-matrix composites  

作　　者：Yuanyuan Lu Hui Yu Yongzhen Cheng Yu Liu Dejian Liu Yanqin Huang 

机构地区：[1]Hengpu(Ningbo)Laser Technology Co.,Ltd.,Ningbo 315048,China [2]State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [3]International Department of Harbin Ninth Pre-college,Harbin 150001,China

出　　处：《China Welding》2025年第1期57-66,共10页中国焊接(英文版)

基　　金：supported by the Equipment Pre-research and Sharing Technology(41423030503)provided funding for this work;The Equipment Pre-research and Sharing Technology(41423030503)funded this work.

摘　　要：This work used 5CrMnMo steel and titanium carbide(TiC)powders to fabricate particulate metal matrix composites(PMMCS).The composites’microstructure,hardness,and impact toughness were compared with four different titanium carbide ceramic particle sizes.The phase composition and microstructure of composites were studied.Vickers hardness and Charpy impact tests were employed to analyze composites’hardness and impact ductility,respectively.The results showed that the four groups of composites are mainly composed of martensite,trace residual austenite,and titanium carbide(undissolved TiC and primary TiC particles).With the growth of the ceramic particle dimension in the composite layer,the number of primary titanium carbide ceramics gradually decreased.When the initial ceramic particle size was small,it tended to generate dendritic primary TiC,and when the particle size was large,it tended to generate polygons and ellipsoids.Furthermore,with the growth of titanium carbide ceramic particle dimension in the composites,the hardness of the composites decreased but the impact toughness of the composites rose first and then descended.When the ceramic particle size was 50-75μm,the composite had the highest hardness,and the impact energy of the composites was the highest,which is 8 J.This was because there were more undissolved titanium carbide ceramics in the composite,and there was a thicker matrix metal between the ceramic particles.

关 键 词：Particulate metal matrix composite Particle size MICROSTRUCTURE Impact toughness 

分 类 号：TB333[一般工业技术—材料科学与工程]