摘要
采取不同的淬火(800℃,900℃,1000℃)和回火(200℃,400℃,600℃)热处理工艺,对含锰6%的中锰球墨铸铁组织和力学性能进行了研究.结果表明:中锰球墨铸铁的合理热处理工艺为在900℃奥氏体化保温2h水淬,在200℃回火2 h水淬.淬火后的组织为大量的马氏体+贝氏体+残余奥氏体+球状石墨,淬火和回火后的组织为回火马氏体+贝氏体+少量残余奥氏体+碳化物+球状石墨.热处理后试样的硬度下降,冲击韧性提高,耐磨性下降.淬火温度对试样的硬度、冲击韧性和耐磨性影响较大,回火温度对试样的硬度、冲击韧性和耐磨性影响较小.
The influences of quenching （800 ℃ ,900 ℃ ,1000 ℃ ） and tempering （200 ℃ ,400 ℃ ,600 ℃ ） processes on mierostructure and the mechanical properties of Medium Manganese Nodular Cast Iron with 6% Mn were studied. The results show that the optimized heat treatment of Nodular Cast Iron is austenitie treated at 900 ℃ for 2 h followed by water quenching, and then tempered at 200 ℃ for 2 h before water quenching. Quenching microstrueture of Nodular Cast Iron is major martensite ＋ bainite ＋ retained austenite ＋ spheroidal graphite. Microstructure of Nodular Cast Iron after quenching and tempering is tempered martensite ＋ bainite ＋ a small amount of retained austenite ＋ carbide ＋ spheroidal graphite. After heat treatment, hardness of samples decreased, impact toughness improved, wear resistance decreased. Quenching temperature has greater impact on the mechanical properties than tempering temperature.
出处
《哈尔滨理工大学学报》
CAS
北大核心
2009年第4期107-109,113,共4页
Journal of Harbin University of Science and Technology
基金
黑龙江省教育厅基金资助项目(11511084)
哈尔滨市青年科学研究基金资助项目(2005AFQXJ030)
关键词
热处理
中锰球墨铸铁
组织
力学性能
heat treatment
medium manganese nodular east iron
microstructure
the mechanieal properties
