摘要
采用Thermo-Calc热力学软件计算Fe-C伪二元系在不同铬含量(Fe-3.0%C-10.0%V-0.8%Si-0.8%Mn-X%Cr,X分别为2.0,5.0,10.0,质量分数,下同)下的垂直截面图和凝固过程中各相转变过程图。利用OM,SEM,EDS,XRD,DSC和耐磨实验等实验手段,研究铬对相图和凝固组织的影响规律。结果表明:随着铬含量的增加,相图共晶点和相区大小变化不明显。合金凝固过程中各相的转变测试温度与计算结果相接近。合金的凝固组织为α-Fe,MC和M_7C_3等相,铬主要分布在α-Fe和M_7C_3型碳化物中。随着铬含量的增大,MC的数量逐渐减少,M_7C_3数量逐渐增加,α-Fe数量基本不变。硬度随着铬的增加而显著增大,铬含量为10.0%时达到最高值67.0HRC。铬含量为5.0%时,其磨损失重最低,约为15.6mg,耐磨性最佳。
The equilibrium solidified and the vertical section phase diagrams of Fe-C pseudo-binary were drawn with different chromium content(Fe-3.0%C-10.0%V-0.8%Si-0.8%Mn-X%Cr,X=2.0,5.0,10.0,mass fraction)by the Thermo-Calc software.The effect of chromium on the phase diagrams and solidification microstructure was investigated by OM,SEM,EDS,XRD,DSC and wear resistance test.The results show that the changes of eutectic transition points and phase region area are tiny with the increase of chromium content.The calculated temperatures of precipitated phase are close to the DSC results.The solidification microstructure is composed withα-Fe,MC,and M 7C 3.Chromium is mainly distributed inα-Fe and M 7C 3 carbides.With the increase of chromium,the amount of MC decreases and the amount of M 7C 3 increases;theα-Fe has no change.The hardness of the cast alloy increases with the increase of chromium content,and the maximum value reaches to 67.0HRC when chromium content is 10.0%.The wear loss is about 15.6mg when the chromium content is 5.0%,the wear resistance is the best.
作者
杨勇维
符寒光
鞠江
王开明
雷永平
朱礼龙
江亮
YANG Yong-wei;FU Han-guang;JU Jiang;WANG Kai-ming;LEI Yong-ping;ZHU Li-long;JIANG Liang(College of Materials Science and Engineering,Beijing University ofTechnology,Beijing 100124,China;Powder Metallurgy Research Institute, Central South University,Changsha 410083,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2018年第9期122-130,共9页
Journal of Materials Engineering
基金
国家自然科学基金项目(51475005)
关键词
高钒耐磨合金
铸态组织
相图计算
凝固
耐磨性
high vanadium wear-resistant alloy
cast microstructure
phase diagram calculation
solidification
wear resistance