摘要
采用1.2%～1.8%的镍对低温球墨铸铁进行合金化,同时加入2.0%～2.5%Si,并采用石墨化两阶段退火或低温石墨化退火工艺进行热处理。结果表明,热处理后材料的微观组织由铁素体、球状石墨和极少珠光体组成。当Si量为2.01%,Ni量为1.2%时,-20℃和-40℃的低温冲击功AKV都最高,分别达到16.3 J和13.6 J,同时抗拉强度大于400 MPa,伸长率高达23%。因此,要获得低温高韧性球墨铸铁,即保证不降低材料低温冲击功的前提下,提高其抗拉强度,应该选择合理的镍、硅含量,其中Ni量不超过1.5%,Si量在1.9%和2.3%之间。
Low-temperature ductile iron were alloyed with 1.2%-1.8% Ni and 2.0%-2.5%Si, and then treated through two-stage graphitization annealing or low temperature graphitization annealing process. The results show that the microstructure of ductile iron after heat treatment is composed of ferrite, spherical graphite and small amount of pearlite;when the content of Si is 2.01% and the content of Ni is 1.2%, the low temperature impact energy Akv is the highest, reaching 16.3 J at-20 ℃ and 13.6 J at-40 ℃, respectively, and its tensile strength is greater than 400 MPa, elongation is up to 23%, which implies that low temperature ductile iron with high tensile strength and high toughness in a condition that ensures its low temperature impact energy can be obtained when the content of Ni is not more than 1.5% and that of Si is between 1.9% and 2.3%.
作者
王文慧
孙玉福
肖志云
WANG Wen-hui;SUN Yu-fu;XIAO Zhi-yun(Material Science and Engineering College, Zhengzhou University, Zhengzhou 450002, Henan, China)
出处
《铸造》
CAS
北大核心
2019年第5期456-463,共8页
Foundry
关键词
低温高韧性球墨铸铁
镍、硅复合添加
低温冲击韧性
风电铸件
low-temperature high-ductility ductile iron
combined addition of nickel and silicon
low-temperature impact toughness
wind power castings
