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.
出处
《铸造技术》
CAS
北大核心
2012年第7期768-770,共3页
Foundry Technology
关键词
合金化
过冷石墨
熔炼工艺
microalloying
undercooled graphite
smelting process
