摘要
在熔炼方式改变导致铁素体球墨铸铁基体硬度降低的情况下,对影响其硬度的几个因素进行了分析,并围绕这些影响因素进行了大量试验研究,得出以下结论:(1)对于双联熔炼、多品种混流作业的生产方式,调整w(C)量会使部分铸件发生缩松缺陷的风险增加,因此通过固溶强化及降C增Mn来改善铸件硬度的方法不可行;(2)中频炉熔炼铁液时增加适量的P,使w(P)量达到0.035%左右,可以有效提高球墨铸铁的基体硬度,也是解决中频炉熔炼条件下铁素体球墨铸铁硬度不达标问题的一种切实可行的方法。
Under the condition that the matrix hardness of ferrite nodular iron was reduced due to the change of melting mode,several factors affecting its hardness was analyzed,and a lot of experimental studies were carried out around these factors,following conclusion were obtained:(1)For duplex smelting,multi-species mixed-flow production,adjusting the content of w(C)would increase the rwask of shrinkage defects in some castings,therefore,it was not feasible to improve the hardness of castings by means of solid solution strengthening and decreasing C to increase Mn.(2)When melting cast iron melt in medium frequency furnace,by adding appropriate amount of P to elevate the P content to about 0.035 %,it was possible to elevate effectively the matrix harness of the nodular iron,it was also a feasible method to solve the problem that the hardness of ferrite nodular iron was not up to standard under the condition of medium frequency furnace smelting.
引文
[1]李传栻.Si在铸铁中的固溶强化作用[J].金属加工(热加工),2015,(01):81-85.
[2]黄彪,龚文邦,高辉武,等.高Si球墨铸铁及其应用发展[J].现代铸铁,2018,(01):29-32.
[3]彭凡,尤国庆,郭亮.QT900-2高强韧厚大断面球墨铸铁的研究[J].现代铸铁,2018,(01):33-37.
[4]郑言彪,张军.低温条件下QTD900-8的力学性能研究[J].现代铸铁,2019,(01):5-8.
[5]孙成瑜,王秀国.冲入法球化处理工艺的改进[J].现代铸铁,2019,(01):9-13.
[6]张伯明,王继祥.高Si球墨铸铁的新发展[J].现代铸铁,2013,(05):44-53.
[7]郝石坚.现代球墨铸铁[M].北京:煤炭工业出版社,1989.
