CE、Si/C值和壁厚对高Si/C值灰铸铁性能及组织的影响  

Effect of CE,Si/C and Wall Thickness on Performance and Microstructure of Gray Cast Iron with High Si/C Ratio

作　　者：衣庆军[1] 李南[1] 姚正辉[2] 

机构地区：[1]沈阳机床银丰铸造有限公司,辽宁沈阳110200 [2]沈阳大学,辽宁沈阳110044

出　　处：《铸造》2009年第8期823-826,共4页Foundry

摘　　要：在生产过程中，对于不同壁厚的铸件，改变CE和Si／C值，试验了它们对灰铸铁性能和组织的影响。结果表明：当CE一定，Si／C值由0．6～1．0之间变化时，所对应的强度和硬度是条相似的凸形抛物线，当Si／C值达到0．8左右时强度硬度出现峰值，当Si／C〉0．9时强度硬度随Si／C值增加而急速下降。Si／C值一定，改变CE，强度硬度随Si／C值增加而下降。当CE〉3．9％、Si／C〉1．0或CE〉4．0％、Si／C〉0．9时铸件产生疏松倾向加剧，并伴有较多的铁素体产生，即使对壁厚小于10mm的薄壁件也产生铁素体。当Si／C〉0．95时，铁液呈糊状凝固，流动性下降。During the production, the influence of the changing of CE and Si/C on gray cast iron＇s performance and microstructure, of which wall thickness was different, was teste. The results indicate that., when CE was fixed and the value of Si/C changed from 0.6 to 1.0, the curves of strength and hardness to Si/C were similar convex parabola; when the value of Si/C reached about 0.8, the peak value of strength and hardness appeared; when the value bigger than 0.9, the strength and hardness decreased swiftly as the Si/C value increased; when Si/C value was fixed and CE changed, the strength and hardness decreased as the Si/C value increased; when CE〉3.9%, Si/C〉1.0 or CE〉4.0%, Si/C〉0.9, the tendency of occurring porosity in castings intensified, meanwhile many ferrite were produced, even in the thin walled parts less than 10 mm; when Si/C〉0.95, the molten iron present pulpiness.

关 键 词：碳当量(CE) Si/C值 壁厚 灰铸铁 

分 类 号：TG251[金属学及工艺—铸造]