铸造2011，Vol.60Issue(9)：831-835,5.
Mn含量对高强韧TWIP球墨铸铁组织和性能的影响
Effect of Mn Content.on Microstructures and Properties of High-Strength and High-Toughness TWlP Ductile Iron
摘要
Abstract
The Fe-xMn-3.5C-3Si-3Cu-8Ni (x=10, 13, 16) alloys with three different contents of manganese were prepared. Their as-cast structures are composed of spherical graphite and carbide, which dispersed in the austenite matrix, and the carbide amount increases with the increase of manganese content. After solution treatment at 1 050 ℃ for 10 h, the microstructure of the iron changed into two phases: austenite and graphite. There were a large number of deformation twins in the austenite matrix after tensile deformation, which indicated extremely high strength and plasticity. The research result shows that the high strength and plasticity of the cast irons result from the TWIP effect in the deformation process. The higher the manganese content, the more intensive the deformation twins, and the more obvious the TWIP effect, thereby the better comprehensive mechanical properties. When the manganese content is 16 wt.%, the tensile strength of the ductile iron reaches its maximum value of 726.5 Mpa; its elongation also reaches 29.36%, and its bending strength and impact toughness up to 1 423 Mpa and 161.5 J ·cm-2, respectively. It is clear that the cast irons are superior in performance to other ductile irons of the same type.关键词
锰含量/奥氏体球墨铸铁/力学性能/形变孪晶/TWIP效应Key words
manganese content/ austenite ductile iron/ mechanical property/ deformation twins/ TWIP effect分类
矿业与冶金引用本文复制引用
黄芬芬,朱定一,宋卫涛,王明杰..Mn含量对高强韧TWIP球墨铸铁组织和性能的影响[J].铸造,2011,60(9):831-835,5.基金项目
福建省高校产学合作科技重大项目(2011H6012). （2011H6012）
