两种大断面球墨铸铁用孕育剂的效果分析  

Effect Analysis of Two Inoculants for Large Section Ductile Iron

作　　者：倪钧 马寒坤 狄崇祥 张本水 赵平 张吉祥 郭利霞 NI Jun;MA Han-kun;DI Chong-xiang;ZHANG Ben-shui;ZHAO Ping;ZHANG Ji-xiang;GUO Li-xia(College of Materials Science and Engineering,Qingdao University of Science&Technology,Qingdao 266044,Shandong,China;Inner Mongolia Shengquan Keliyuan New Material Technology Co.,Ltd.,Bayannur 0144000,Inner Mongolia,China)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042 [2]内蒙古圣泉科利源新材料科技有限公司,内蒙古自治区巴彦淖尔014400

出　　处：《铸造》2022年第9期1127-1132,共6页Foundry

基　　金：山东省自然科学基金面上项目(ZR2020ME009)。

摘　　要：根据风电大断面球墨铸铁件的生产需要,开发了Si-Ba和Si-Bi两种高效孕育剂。利用阶梯试样模拟铸造中试试验,对比分析了不同壁厚的采用两种孕育剂试样的微观组织以及力学性能。结果表明:两种孕育剂都可以提高球墨铸铁的球化率,减小石墨球平均尺寸。Si-Bi孕育剂不但能提高球化率,而且极大增加了石墨球数,平均石墨球数达到80个/mm^(2);采用Si-Bi孕育剂的试件在球化率及石墨球数上均高于采用Si-Ba孕育剂的试件,且采用Si-Bi孕育剂的试件石墨球平均尺寸较小。采用两种孕育剂的试件性能均高于标准值,在不同壁厚条件下,采用Si-Bi孕育剂的试件抗拉强度及屈服强度均高于采用Si-Ba孕育剂的试件。在200 mm壁厚尺寸下,采用Si-Bi孕育剂试件抗拉强度具有最大值445 MPa。在不同壁厚条件下,采用Si-Bi孕育剂的试件其断面收缩率、断后伸长率多数低于采用Si-Ba孕育剂的试件;采用Si-Bi孕育剂的球墨铸铁强度明显高于采用Si-Ba孕育剂的强度,而采用Si-Ba孕育剂的铸件延展性较好。According to the production needs of large section ductile iron castings of wind power,two high-efficiency inoculants,Si-Ba and Si-Bi,were developed.The microstructure and mechanical properties of two kinds of inoculants with different wall thickness were compared and analyzed by simulating the pilot test of casting with stepped samples.The results show that both inoculants can improve the spheroidization rate of ductile iron and reduce the average size of graphite ball.Si-Bi inoculant not only improves the spheroidization rate,but also greatly increases the number of graphite balls,and the average number of graphite balls reaches 80/mm^(2).The spheroidization rate and the number of graphite balls of the specimens with Si-Bi inoculant are higher than those with Si-Ba inoculant,and the average size of graphite balls of the specimens with Si-Bi inoculant is smaller.The properties of the specimens with two inoculants are higher than the standard value.Under the conditions of different wall thickness,the tensile strength and yield strength of the specimens with Si-Bi inoculant are higher than those with Si-Ba inoculant.Under the wall thickness of 200 mm,the tensile strength of the specimen with Si-Bi inoculant has a maximum value of 445 MPa.Under the condition of different wall thickness,the area shrinkage and elongation after fracture of the specimens with Si-Bi inoculant are lower than those with Si-Ba inoculant.The strength of ductile iron with Si-Bi inoculant is significantly higher than that with Si-Ba inoculant,and the ductility of castings with Si-Ba inoculant is better.

关 键 词：风电铸件 高效孕育剂 球化率 石墨球 

分 类 号：TG255[金属学及工艺—铸造]