微合金化对高碳当量灰铁组织的影响  

Effect of Microalloying on Microstructure of High Carbon Equivalent Grey Iron

作　　者：张小雪[1] 刘兰俊[1] 李永红[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]安徽神剑科技股份有限公司,安徽合肥230022

出　　处：《铸造技术》2012年第7期768-770,共3页Foundry Technology

摘　　要：Mn和S是阻碍石墨化元素,但在试验中发现:快冷时,Mn和S含量越高,石墨越粗大;当冷速较慢时,Mn和S含量越高,石墨反而变小。针对此现象,研究了微合金化对高碳当量灰铁组织的影响。结果表明,Mn促使过冷石墨形成,冷速越慢,过冷区越多;高碳当量灰铁中加入适量的Cr、Cu、Sn等合金元素,可使其组织全部为珠光体。Mn and S are the elements of hindering graphitizing, but find： when the cooling rate is high, the higher the content of Mn and S, the larger the size of graphite flake; when the cooling rate was low, the higher the content of Mn and S, the smaller the size of graphite flake. Aimed at above phenomena, the effect of microalloying on the microstructure of high carbon equivalent grey iron was studied. The results show that Mn favors the formation of undercooled graphite. When reducing the cooling rate of melt,the region of undercooled graphite increases. Adding an appropriate amount of alloying elements Cr, Cu and Sn in the cast iron can make the microstructure change into 100% pearlite.

关 键 词：合金化 过冷石墨 熔炼工艺 

分 类 号：TG251[金属学及工艺—铸造]