摘要
采用金相显微镜、X射线衍射仪、硬度及冲击韧度仪,研究了钒含量对低铬合金铸铁组织和性能的影响。结果表明:随着钒含量的增加,铸态试样的硬度和冲击韧度都增大;钒含量达到1%时,硬度可达到HRC 56.7,钒含量为0.75%时,冲击韧度达到最大值5.75 J/cm2;经过950℃保温3 h热处理后,试样的硬度和冲击韧度都有较大程度的提高;钒含量为0.75%试样的硬度达到HRC 63.3,钒含量为0.5%试样的冲击韧度达到9.13 J/cm2。钒的加入不仅可以细化晶粒,也可以提高材料性能。热处理后金相组织中网状碳化物数量减少,局部出现断网,碳化物尖角钝化,有白色碳化物析出。
The effect of different vanadium contents on the microstructure and property of low-Cr alloy cast iron was researched by means ofmetalloscope, XRD, hardness and toughness testing. The results show that with the increase of vanadium content, the hardness and toughness of the as-cast sample all increase; the hardness of sample with 1% V reach to HRC 56.7, the maximum toughness of the sample with 0.75% V is 5.75 J/c㎡. After the heat treatment at 950 ℃ for 3 h, the hardness and toughness have greatly increased. The hardness of the sample with 0.75% V is HRC 63.3, the impact toughness reached to 9.13 J/c㎡ with 0.5% V. The V addition not only can refine the grain size, but also can improve the material properties. In the microstructure of the sample after heat treatment, the number of network of carbide decreased, local carbide network was broken, the angle of carbide was passivated, and the white carbide precipitated.
出处
《铸造》
CAS
CSCD
北大核心
2014年第1期75-77,共3页
Foundry
基金
内蒙古工业大学校基金资助项目(X201317)
关键词
钒
低铬合金
耐磨铸铁
组织
性能
vanadium
low-chrome alloy
wear-resisting iron
microstructure
property
