原料配比对球墨铸铁珠光体片层间距及硬度的影响.pdfVIP

学兔兔 Apr．2011 铸 造 VOI．60 NO．4 FOUNDRY ·397 · 原料配比对球墨铸铁珠光体片层间距 及硬度的影响 赵 岩l (1．德州学院机电工程系，山东德州253023；2．德州学院工程材料研究所，山东德州253023) 摘要：采用不同配比的生铁和废钢，硅铁及电极石墨作为增碳剂，在相同铸造工艺下，制备化学成分基本相同的球墨 铸铁，并对试样的显微组织和硬度进行了分析。结果表明，原料配比对球墨铸铁中珠光体的形态、片层间距的大小以 及球铁的硬度存在显著的影响。随着原料中生铁所占比例的降低，球铁基体中珠光体的片层间距逐渐减小，球铁的硬 度逐渐升高。特别是全部使用废钢生产时，球铁硬度较大幅度地提高。 关键词：球墨铸铁；原料配比；珠光体；硬度 中图分类号：TG143．5 文献标识码：A 文章编号：1001—4977(201 1)04—0397—04 Effects of Raw MateriaI Proportioning on Pearlitic Lamellar Spacing and Hardness of Ductile Iron ZHA0 Yah1-0 (1．Department of Mechanical and Electronical Engineering，Dezhou University， Dezhou 253023，Shandong，China；2．Research Institute of Engineering Materials，Dezhou University，Dezhou 253023，Shandong，China) Abstract：With the same casting technique．the ducllie irons with the same chemical composition were made by the di仟erent mixture ratio of pig iron，scrap steel。ferrosilicon and electrode graphite。 The microstructures of the specimens were analyzed．and the hardness values of Ihem were tested． The results show that the raw materiaI proportioning has obvious effects on pearlitic pattern．pearlitic lamellar spacing．and hardRess of ductlie iron．The pearlitic Iamellar spacing of the matrix decreases．and the hardness of the ductile iron jncreases with the pig jron proportion decreasing． Especially when ductile iron iS made of fulI scrap stee1．the hardness jncreases by a Iarge margin． Key words：ductile iron；raw material proportioning；pearlite；hardness 球墨铸铁自从20世纪40年代问世以来，就以其优 而并未涉及原