湖南大学学报（自然科学版）2016，Vol.43Issue(6)：76-82,7.
低温石墨化退火对低钼、低镍球墨铸铁组织和力学性能的影响
Effects of Low Temperature Graphitization Annealing on Microstructure and Mechanical Properties of Nodular Cast Iron with Low Nickel and Molybdenum
摘要
Abstract
The mechanical properties of ductile iron samples containing 0 .25% molybdenum and 0 .2%~0 .8% nickel were tested after being annealed at a low graphitization temperature .The microstructure and impact fracture were observed and analyzed .The ferrite content of ductile iron was increased after adding a small amount of molybdenum and nickel .Consequently ,the impact toughness was increased by more than 50% while the strength and the hardness were decreased .The pearlite in the ductile iron was gradually transformed into ferrite after low temperature annealing .The impact toughness was increased substantially and the impact absorbed energy was increased to 500% compared with cast ductile iron sam‐ples .Many tearing ridges and dimples were found on the impact fracture through SEM observation .The mechanical properties in different annealing parameters were relatively more stable with a smaller fluctua‐tion after molybdenum and nickel were added .关键词
球墨铸铁/退火/显微组织/冲击韧度Key words
ductile iron/anneal/microstructure/impact toughness分类
金属材料引用本文复制引用
张福全,徐共财,黄为,彭斌..低温石墨化退火对低钼、低镍球墨铸铁组织和力学性能的影响[J].湖南大学学报（自然科学版）,2016,43(6):76-82,7.基金项目
湖南省战略性新尖产业科技攻关项目（湘财企指（2014）66号） （）
