低蠕化率蠕铁与球化不良及衰退球铁的区别  

Difference Between Low-Vermicularity Vermicular Iron and Poor Nodularized and Degenerate Nodular Iron

作　　者：赵新武 

机构地区：[1]西峡县内燃机进排气管有限责任公司,河南西峡474500

出　　处：《现代铸铁》2016年第2期49-52,共4页Modern Cast Iron

摘　　要：详细介绍了低蠕化率蠕铁、球化不良球铁及球化衰退球铁的区别。金相组织的区别是:低蠕化率蠕铁的球状石墨圆整,蠕虫状石墨粗短,只有极少量的团絮状石墨,没有片状石墨,基体组织细密;球化衰退的球铁石墨形态恶化,开花状石墨和团絮状石墨较多,严重时有片状石墨,组织粗大;球化良好的铸铁,球墨圆整,极少团絮状和蠕虫状石墨,没有片状石墨,组织细密。力学性能的区别是:球化衰退球铁的力学性能已明显下降,低蠕化率蠕铁的力学性能则远高于规定要求,如果采用适当的热处理方法,在冷热交变环境下服役能显示优异性能,因此,不能笼统地将其判为废品。The differences between low-vermicularity vermicular iron,poor nodularized nodular iron and degenerate nodular iron were introduced in detail. The difference of microstructure was as follows:the low-vermicularity vermicular iron had graphite nodule of good roundness,thick and short vermicular graphite,a very little of quasi nodular-temper grasphite,no flake graphite,and dense-fine matrix structure. The difference of mechanical properties was as follows:the degenerate nodular iron has obviuosly decreasing mechanical propertis,the low-vermcularity vermicular iron has mechanical properties much higher than stipulated requirements. If adopting proper heat-treating process,the low-vermicularity vermicular iron could show excellent properties under the cold-heat alternating circumstance,therefore,it would be not proper to consider it generally as the unqualifed casting.

关 键 词：低蠕化率蠕铁 球化不良 球化衰退 冷热交变环境 

分 类 号：TG255[金属学及工艺—铸造]