论文部分内容阅读
采用测试硬度、冲击韧度和观察显微组织等方法,研究了钒加入量对稀土低铬合金铸铁组织和性能的影响。研究表明:在铸态条件下,随着钒含量的增加硬度增大,当钒含量到达1%时,其硬度达到53.6 HRC;经过250℃回火保温2 h的热处理后,试样的硬度呈先增加后降低的趋势,钒含量为0.75%时,硬度达到55.5 HRC。铸态条件下,当钒含量为0.75%时,冲击韧度达到5.8 J/cm2。经过同样的热处理工艺后,试样的冲击韧度有较大程度地提高,当钒含量为0.75%时达到10.7 J/cm2。通过对试样的金相组织观察发现,随着钒含量的增加,网状碳化物数量减少,热处理后局部出现断网,有白色碳化物析出。
The effect of vanadium content on microstructure and properties of rare earth low chromium alloy cast iron was studied by testing hardness, impact toughness and microstructure observation. The results show that with the increase of vanadium content, the hardness increases with the increase of vanadium content. When the vanadium content reaches 1%, the hardness reaches 53.6 HRC. After heat treatment at 250 ℃ for 2 h, First increase and then decrease the trend, the vanadium content of 0.75%, the hardness reached 55.5 HRC. As-cast condition, the impact toughness reached 5.8 J / cm2 when vanadium content was 0.75%. After the same heat treatment process, the impact toughness of the sample to a greater extent, when the vanadium content of 0.75% to 10.7 J / cm2. Through the microstructure observation of the sample, it was found that with the increase of vanadium content, the amount of network carbides decreased, and after the heat treatment, the network was partially broken and white carbides were precipitated.