Nodular Iron
铸态QT700-10球墨铸铁的研制
张军,文宏,郑言彪,齐基
(湖北省机电研究设计院股份公司,湖北武汉430070)
摘要:介绍了QT700-10球墨铸铁的生产工艺:合理设计化学成分,采用0.5t中频电炉熔炼;选用FeSiMg8RE3球化剂,
包内孕育剂选用75SiFe,二次孕育及随流孕育采用自行配制含有Sb、Ba、Ca等多种元素的复合孕育剂,冲入法进行球化
及孕育处理。生产结果显示:从浇注的Y型试块及铸,检测得到的铸学均符合技术
求,随后进行了批生产,试棒结果:球化等1~3,墨6~7,+铁素,中,
珠光体体积分数50%~70%,抗拉强度700-750MPa,伸长率10%~13.5%,硬度220-250HB。
关键词:球墨铸铁;;
中图分类号:TG255文献标志码:B文章编号:1003-8345(2020)06-0011-03
D0I:10.3969/j.issn.1003-8345.2020.06.003
Development of As-cast QT700-10Nodular Iron
ZHANG Jun,WEN Hong,ZHENG Yan-biao,Qi Ji
(Hubei Mechanical and Electrical Research and Design Institute Co.,Ltd.,Wuhan430070,China)
Abstract:The production process of QT700-10nodular iron was introduced:using0.5t medium frequency furnace to conduct melting,using FeSiMg8RE3nodularizing alloy,choosing75SiFe for ladle inoculation,for secondary inoculation and stream inoculation using self-made composite inoculants containing multiple elements including Sb,Ba,Ca,adopting pour-over process
to conduct nodularization and inoculation treatment.The production results showed:by sampling from Y-type test block and
from casting body,detected metallographic structure and mechanical properties met technical requirements.Subsequently,
small batch production was carried out,the inspection results of casting body test bar were as following:nodularizing grade
was of1-3grade,graphite size was of6-7grade,the matrix structure was of pearlite+ferrite,and the volume fraction of pearlite
was of50%-70%,tensile strength was of700-750MPa,elongation was of10%-13.5%,hardness was of220-250HB.
Key words:nodular iron;high strength;high toughness
中制2025化政策要求,、球墨铸铁的合要求
GF公司、公司等采用、
、等的铸球墨铸铁生产高
,技术处
,的低端球墨铸铁为主c1d,公司了
收稿日期:2020-06-11修订日期:2020-11-28
作者简介:张军(1979—),男,安徽阜+人,硕士,/0工程3,主要从事ADI、铸态/强度、耐疲劳球墨铸铁和耐磨铸铁材料的研I及管理工作。
球墨铸铁的研究工,并成试制出 的铸球墨铸铁,其铸:
抗拉强度!700MPa,伸长率!10%。
1试验方法
1.1化学成分
合的化学成分产铸的关键因素之一合分析各有关元
素球墨铸铁的影响,结合多年的实践经验,制的化学成分如表1所示〔已。
1.2球化处理及孕育处理工艺
球化剂孕育剂球墨铸铁生产的核心材料,选择直接关系球墨铸铁的产品。
2020/6现代铸铁|1!
Nodular  Iron
表1化学成分设计 w B /%Tab.l  Chemical  composition  design
w B /%
C Si Mn S P
Cu
M g
RE
3.4-3.9
2.2-2.70.2-0.5!0.02!0.020.2-0.70.03-0.060.02-0.04
本次试验选用FeSiMg8RE3球化剂,包内孕育剂 选用75SiFe ,二次孕育及随流孕育采用自行配制
含有Sb 、Ba 、Ca 等多种元素的复合孕育剂来强化 孕育效果叫
1.3熔炼工艺
为保证铁液质量,采用0.5 t 中频电炉熔炼,
要求炉膛内洁净,无残留合金铁液。采用GS1000 直读光谱仪、HCS-140高频红外碳硫分析仪、德
国贺利氏热分析仪进行炉前分析和炉后分析。铁
液出炉温度为1 500 #,采用堤
行化孕育。化 ,转
行注,浇注时采用多次孕育 工艺。
2试验结果
按照上 工艺要求进行Y 型试
铸注。
,试和本采试
要求,本 的试
1
进行 ,的
2 ,金
果 3
,金 照
2 L
3结束语
表2 本体试棒的力学性能统计表
Tab.2 Mechanical  properties  statistics  of  test
bar  from  casting  body 抗拉强度/MPa
伸长率/%
硬度/HB
700〜750
10-13.5
220-250
表3本体试棒的金相组织检测结果
Tab.3 Metallurgical  structure  test  result  of  test
bar  from  casting  body 球化级别 /级
球径大小 /级
珠光体体积 分数/%
1-3
6-7
珠光体+铁素体
50-70
(a)石墨大小
(b  )基体组织
图2金相组织照片100x
Fig.2 Metallurgical  structure  photo  100x
和 工艺, 采用多元合金强化 多次孕育
理, 合 的铸 铸铁件。
参考文献
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6
Gray Iron
采用3D打印技术生产大型防爆电机壳体铸件
李栋,梁继亚,马步强,李朝东
(共享智能铸造产业创新中心有限公司,宁夏银川750021)
摘要:介绍了电机壳体铸件的结构及技术要求,详细阐述了该铸件的生产工艺:采用半封闭式浇注系统,直浇道从铸件
顶入,横浇道铸件,内浇道浇道入,铸件顶法处进态;
采用3D打印组芯造型,原砂采用100/140目硅砂,选用流涂的施涂方法;炉料配比为5%~15%生铁+50%~70%废钢+
30%~35%回炉料,采用75SiFe进行孕育处理,孕育入量0.15%;浇注45s。首件铸件经检测,成形外观良好,整
体CT9,符
关键词:灰铸铁;电机壳;3D印
中图分类号:TG251文献标志码:B文章编号:1003-8345(2020)06-0013-03张少华
D0I:10.3969/j.issn.1003-8345.2020.06.004
Using3D-printing Technique to Produce Heavy Explosion-proof Electric Motor Housing Casting
LI Dong,LIANG Ji-ya,MA Bu-qiang,LI Chao-dong
(National Intelligent Foundry Innovation Center Co.,Ltd.,Yinchuan750021,China)
Abstract:The casting structure and technical requirements of the electric motor housing were introduce
d.The production process
and method of the casting was described in detail:semi-pressured gating system was used,the sprue goes downward from top
of casting,the runner bar was set spirally on the casting top part,the ingates went into mold cavity from outer side of the
runner bar,risers were set on the top flange of casting to feed liquidly.The mold was made by using3D-printed cores assembly.100/140mesh silica sand was used as raw sand,flow coating process was adopted.Melting charge mixture ratio was
of5%~15%pig iron+50%~70%steel scrap+30%~35%foundry returns.75SiFe was used for inoculation,the adding amount
of inoculant was of0.15%,pouring time was of45s.The inspection result of the first casting showed: its exterior form was good,the overall dimensional accuracy of casting reached CT9grade,meeting acceptance standard.
Key words:gray iron;electric motor housing;3D printing
司电机壳体铸件的铸造,铸件结1,3件件
有20,工艺法策划时,3D
收稿日期:2020-06-10修订日期:2020-11-23
作者简介:李栋(1900.4—),男,汉族,宁夏银川人,学士,高级工程师,主要从事3D打印技术在砂型铸造领域的推广应用工作。
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(编辑:吕姗姗,E-mail:****************)
2020/6现代铸铁13