摘要
利用中频感应电炉熔炼灰铸铁,浇注阶梯型试样和拉伸试棒,研究不同的碳当量、冷却速度、含硫量对灰铸铁石墨形态的影响。实验结果表明:较高的碳当量能获得较多数目的 A型石墨,材料的抗拉强度增加;冷却速度过快易出现D型石墨,冷却速度过慢易出现C型石墨,合理的控制冷却速度能够获得A型石墨;硫质量分数在0.06%~0.10%之间最有利于A型石墨的形成,且含硫量越高铸件的硬度和抗拉强度也越高。
In this paper,ladder-type specimens as well as tensile bars melted in middle frequency induction furnace were tested to investigate the relationship between graphite morphology and casting condition,where carbon equivalent,cooling rate and sulphur content were taken into account. Experimental results indicated that A-type graphite could be obtained at high carbon equivalent condition,resulting in improved tensile strength. Fast cooling rate could prompt the appearance of D-type graphite,C-type graphite generated at the condition of low cooling rate. Production of A-type graphite was achieved by controlling the suitable cooling rate. The most suitable sulphur mass fraction was 0.06% ~0.10%. Additionally,hardness and tensile strength increased with the increasing of sulphur content.
出处
《铸造设备与工艺》
2017年第1期32-36,共5页
Foundry Equipment & Technology
基金
山东省自然科学基金面上项目(ZR2016EMM01)
关键词
灰铸铁
石墨形态
中频感应电炉
熔炼工艺
gray cast iron
graphite morphology
medium frequency induction furnace
melting process
