镍对低温高韧性球墨铸铁组织及性能的影响  

Effect of Nickle on Microstructure and Mechanical Properties of Low-Temperature High-Toughness Ductile Iron

作　　者：孙玉福[1] 尤三三[1] 肖志云[1] 赵靖宇[1] 杨会龙[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450002

出　　处：《铸造》2011年第2期120-125,共6页Foundry

摘　　要：试验采用了0～1-2％的镍对低温球墨铸铁进行合金化，并采用两阶段退火工艺进行热处理。结果表明，材料的微观组织由铁素体＋石墨球＋极少珠光体组成。加入质量分数0．71％Ni的球铁，经热处理后具有良好的冲击韧度，在-20℃、-40℃温度环境下，其冲击韧度分别达到16．6J和12．8J，可以满足球墨铸铁件在高寒地区的使用要求，并保证了在不降低低温冲击韧度的前提下，提高材料强度和硬度，从而弥补因硅量降低带来的强度不足的问题。Low-temperature ductile iron was alloyed with 0-1.2wt% Ni addition, and then heat treated through two-stepped annealing. The results show that the microstructure of ductile iron is composed of ferrite, nodular graphite and a trace of pearlite. The excellent impact toughness of ductile iron can be obtained with 0.71wt% Ni addition and two-stepped annealing. Impact toughness values AKV of the specimens reach 16.6 J at -20℃ and 12.8 J at -40℃, respectively. So that it can meet the requirements of ductile iron in the very frigid regions, and the tensile strength and Brinell hardness of high-toughness ductile iron could be enhanced on the promise of satisfying the low-temperature impact toughness, thus compensates for the silicon declined.

关 键 词：低温高韧性球墨铸铁 镍 组织 强度 低温冲击韧性 

分 类 号：TG255[金属学及工艺—铸造]