铋对球墨铸铁低温韧性的影响  

Effect of Bi on Low-temperature Toughness of Ductile Iron

作　　者：董亮[1] 李长龙[1] 孙晓敏[1] 丁勇 

机构地区：[1]山东建筑大学材料学院,山东济南250101 [2]山东大王金泰集团有限公司,山东东营257335

出　　处：《铸造技术》2010年第12期1580-1583,共4页Foundry Technology

摘　　要：研究了铋对球墨铸铁组织和性能的影响,特别是对低温冲击韧性的影响。实验设计了合适的化学成分和含铋量,制定出合理的生产工艺和热处理工艺。利用光谱分析仪、金相显微镜、低温冲击试验机等设备对试样的化学成分、金相组织和力学性能进行了检测和观察。结果显示,适量的铋可以减小石墨球径,增加石墨球数量,提高球铁的低温冲击韧度。铸态下,未加铋的试样低温冲击韧性约在9 J左右。经热处理后,与铸态下加铋试样的低温冲击韧性近似,在12~13 J左右。加铋并热处理后,低温冲击韧性最高可到17 J。另外,随着加铋后石墨球的细化,低温冲击韧度数值波动变小,性能变得更加稳定。The effect of Bi on microstructure and mechanical properties of ductile iron was studied,especially for low-temperature toughness.With the reasonable production process and heat treatment,the appropriate chemical composition and Bi content was designed.The chemical composition,microstructure and mechanical properties were tested and observed correspondingly.The results show that appropriate amount of Bi can decrease the diameter of graphite sphere,increase the number of graphite sphere,strengthen the low-temperature toughness.The low-temperature toughness without Bi is about 9J on cast state.It is up to 12~13 J after heat treatment,which is similar with the cast sample with Bi.The maximum low-temperature toughness of the sample with Bi can reach 17 J after heat treatment.Additionally,the fluctuations in low-temperature toughness are reduced by adding Bi to refine graphite sphere,the performance becomes more stable.

关 键 词：铋 低温冲击韧性 球墨铸铁 

分 类 号：TG255[金属学及工艺—铸造]