W对铸态高铬铸铁组织和性能的影响  

Influence of Tungsten on Microstructure and Properties of As-Cast Hi-Cr Cast Iron

作　　者：王新华[1] 李志明[1] 方晓辉[1] 邢斌[1] 匡毅[1] 孙玉福[2] 

机构地区：[1]郑州机械研究所,河南郑州450001 [2]郑州大学材料科学与工程学院,河南郑州450002

出　　处：《现代铸铁》2010年第3期31-33,共3页Modern Cast Iron

摘　　要：采用金相显微镜、扫描电镜观察显微组织,X射线衍射分析相组成,并测定洛氏硬度、冲击韧度及耐磨性,研究了w(W)量对高铬铸铁组织及性能的影响。结果表明:含钨高铬铸铁的铸态组织为马氏体+奥氏体+碳化物;W在碳化物和基体中均匀分布,w(W)量为1%时,高铬铸铁硬度为58.75HRC,冲击韧度为11.18J/cm^2;w(W)量达到3%时,高铬铸铁冲击韧度明显下降;w(W)量在0~3%范围内渐增时,随着w(W)量的增加,耐磨性不断提高。By observing the micro structure with optical microscope, analyzing the phase composition with SEM and X-ray diffraction, and by testing Rockwell hardness, impact toughness and wear resistance, the influence of tungsten content on the microstructure and properties of hi-Cr cast irons was investigated. The results showed that the as-cast microstructure of W-containing hi-Cr cast iron consist of martensite＋austenite ＋carbide; the tungsten distributed uniformly in both the carbide and matrix; when w（W）was of 1%, hardness of the hi-Cr cast iron was of 58.75 HRC, its impact toughness was of 11.18 J/cm2; when w（W） reached 3%, the impact toughness of hi-Cr cast iron decreased obviously. When w（W） increased in the range 0~ 3%, wear resistance was improved continuously.

关 键 词：高铬铸铁 W 组织 力学性能 

分 类 号：TG257[金属学及工艺—铸造]