高韧性等温淬火球墨铸铁的生产工艺及力学性能
Production Technics and Mechanical Properties of High Toughness Austempered Ductile Iron
摘 要
为了稳定某高韧性等温淬火球墨铸铁(ADI)铸件的生产,对其进行了化学成分设计,加入铜、钼、镍等元素进行适当的合金化,铸造球铁毛坯,然后采用在880~920 ℃奥氏体化、350~370 ℃等温淬火工艺进行热处理,对其性能进行了测试.结果表明：试样的抗拉强度在908~1 054 MPa时,平均伸长率达11.8%,冲击功136 J,屈服强度744 MPa,布氏硬度271 HB,其力学性能指标明显优于欧盟ADI标准值;同时发现合金化高韧性ADI铸件的力学性能不遵循欧盟ADI标准EN1564中抗拉强度与伸长率、冲击功、屈服强度、布氏硬度之间的变化规律.
高韧性
等温淬火球墨铸铁
力学性能
alloying
high toughness
austempered ductile iron
mechanical property
Abstract
In order to produce high toughness austempered ductile iron (ADI),the influence of chemical composition and heat treatment was studied.The chemical composition of the iron was designed by adding Cu,Mo,Ni.The high quality ductile iron roughcast was made by casting.The heat treatment was performed at austenitizing temperatures of 880-920 ℃ and then at austempered temperatures 350-370 ℃.The mechanical properties of the high toughness ADI sample are tensile strength 908-1 054 MPa,average elongation 11.8%,impact resistance 136 J,yield strength 744 MPa,and Brinell hardness 271 HB.The mechanical properties of the produced high toughness ADI excel the European Community ADI standard,but do not comply with the principle of the change between tensile strength and elongation,impact resistance,yield strength,Brinell hardness in ADI Standard EN1564.
中图分类号 TG255
所属栏目
基金项目 教育部新世纪优秀人才支持计划[2005年]资助项目
收稿日期 2006/9/17
修改稿日期 2007/4/23
网络出版日期
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备注龚文邦(1965-),男,湖南岳阳人,研究员,博士研究生.
引用该论文: GONG Wen-bang,CHEN Li-liang,LIU Rui-xiang,HAO Jing. Production Technics and Mechanical Properties of High Toughness Austempered Ductile Iron[J]. Materials for mechancial engineering, 2007, 31(8): 51～53
龚文邦,陈立亮,刘瑞祥,郝静. 高韧性等温淬火球墨铸铁的生产工艺及力学性能[J]. 机械工程材料, 2007, 31(8): 51～53
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参考文献
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【2】刘金城.关于奥贝球铁及其微观组织术语的探讨[J].现代铸铁,2001(1):9-12.
【3】吴勇生.原始组织对等温淬火后奥贝球铁组织与性能的影响[J].铸造,1998(3):18-22.
【4】刘金城,孙国雄.ADI的冲击韧度和断裂韧度[J].现代铸铁,2003(4):1-6.
【5】孙国雄,刘金城.ADI的研究与应用[J].现代铸铁,2004(1):1-8.
【6】Thomson R C,James J S,Putman D C.Modelling microstructural evolution and mechanical properties of austempered ductile iron[J].Materials Science and Technology,2000,16:1412-1419.
【7】Johansson M.New ADI production technology[C]//Proceeding of the 2002 World Conference on ADI.Louisville,Kentucky,USA:2002:63-67.
【8】Moncada O J.Machinability of austempered ductile iron[J].AFS Transaction,1988(10):39-45.
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