材料与冶金学报2018，Vol.17Issue(2)：138-145,8.DOI:10.14186/j.cnki.1671-6620.2018.02.010
初始组织对一种Nb-Mo微合金化中锰TRIP钢组织演变与力学性能的影响
Influence of initial microstructure on microstructural evolution and mechanical properties of a cold - rolled Nb - Mo microalloyed medium Mn steel
摘要
Abstract
In this work, the combined effects of cooling pattern after hot rolling and cold rolling reduction on microstructural evolution and mechanical properties of a Nb-Mo microalloyed 6. 5Mn-TRIP steel was investigated. The results show that as the cooling pattern after hot rolling changed from oil quenching to furnace cooling, the volume fraction of elongated ferrite increased after intercritical annealing at 650 ℃ for 1 h, and the ratio of long and short axis of ferrite increased as well; however, the grain size of equiaxed ferrite did not change significantly. In the case of oil quenching, as the cold rolling reduction increased from 50% to 75%, the volume fraction of elongated ferrite decreased and its grain size was further refined to 300-400 nm. It can be concluded that the ultrafine-grainedduplex phase TRIP steel exhibited an excellent combination between tensile strength and ductility by increasing the cooling rate after hot rolling with relatively small cold rolling reduction of 50%, i. e. YS ( yield strength) =976 MPa, UTS ( ultimate tensile strength) =1165 MPa, El ( total elongation) =34. 1% and UTS?El was close to 40 GP·%.关键词
中锰钢/微合金化/热轧/冷轧/组织演变/力学性能Key words
Medium Mn steel/microalloying/hot rolling/cold rolling/microstructural evolution/mechanical properties分类
矿业与冶金引用本文复制引用
杨佩儒,杨重远,朱贵星,蔡明晖..初始组织对一种Nb-Mo微合金化中锰TRIP钢组织演变与力学性能的影响[J].材料与冶金学报,2018,17(2):138-145,8.基金项目
东北大学第十批(2016)大学生创新训练计划项目(批号:161040)资助. （2016）
