硅锰对室温油分级等温淬火贝氏体球墨铸铁组织和性能的影响.pdfVIP

学兔兔 铸 造 Sep．2008 FOUNDRY VoI．57 NO．9 硅锰对室温油分级等温淬火贝氏体球墨铸铁 组织和性能的影响 魏德强 ，恽志东 ，刘 军 (1．桂林电子科技大学机电工程学院，广西桂林541004；2．中国石油吉林石化分公司，吉林 132022) 摘要：研究了室温油分级等温淬火时，硅和锰对贝氏体球墨铸铁磨球组织和性能的影响。试验结果表明：硅含量在 3．3‰3．8％时，对贝氏体相变具有诱发作用，使贝氏体球铁组织细化，力学性能提高，锰使贝氏体球墨铸铁的硬度提高 韧性降低，合理的硅锰量可提高贝氏体球墨铸铁的力学性能。 关键词：分级等温淬火；贝氏体；球墨铸铁；诱发相变 中图分类号：TG255 文献标识码：A 文章编号：1001～4977(2008)09—0960—04 Effects of Si and Mn on Microstructure and MechanicaI Properties of Bainite Ductile I ron by Step Austem pering in Room．Temperature Machine O_l WEI De—qiang’，YUN Zhi-dong’，LIU Jun (1．Department of Electronic Machinery and Transportation Engineering，Guilin University of Electronic Technology，Guilin 541 004，Guangxi，China；2．China Petroleum Corporation Jilin PetroleumChemical Branch，Jilin 1 32022．Jilin，China) Abstract：ln this work．the effects of Si and Mn on the microstructure and mechanicaI properties of the bainite ductile iron by step austempering In the room—temperature machine oil have been studied．The experiment results show that induced phase transformation in the bainite ductile iron can be brought out bV S．_n 3．3％．3．8％，and the structure with good mechanicaI properties has been obtained；Mn can increase the hardness and reduce the impact toughness of the bainite ductile iron． Reasonable SI and Mn content can improve mechanical properties of the bainite ductile cast Iron． Key words：step austempering；bainite；duclile iron；induced phase transfcIrmation 贝氏体球铁是一种具有良好综合力学性能、铸造性 转包瞬时孕育。出炉温度≥1 420℃，球化情况采用三 能和加工性能的新型抗磨材料，近年被广泛应用于