Microstructure Evolution and Hardness of Cold Rolled Medium Manganese Steel
LI Nan1,2,SHI Jie2,WANG Cun-yu2,CHEN Wei-liang1,HUI Wei-jun2,CAO Wen-quan2
1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan， China 2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract：In order to reveal the reason for the change of hardness,the evolution of microstructure in cold rolled medium manganese steel was investigated by means of EBSD. The investigation indicate that cold rolled medium manganese steel annealing at 650℃ can be obtained 0.3-0.6μm equiaxed austenite and ferrite ultrafine grain structure, and no obvious coarsening takes place with as extension of annealing time. The volume fraction of austenite increases with increase in temperature from 550℃ to 650℃. Annealing at 700℃, the stability of austenite is reduced for martensite transformation, and the hardness increases. Reverted austenite phase stability is mainly controlled by its carbon content. The higher of the carbon content, the easier access to a large number of stable reverted austenite.
李楠,，时捷，王存宇，陈为亮，惠卫军，曹文全. 冷轧中锰钢退火过程中硬度及组织的演化[J]. 钢铁, 2012, 47(9): 74-78.
LI Nan1,2,SHI Jie2,WANG Cun-yu2,CHEN Wei-liang1,HUI Wei-jun2,CAO Wen-quan2. Microstructure Evolution and Hardness of Cold Rolled Medium Manganese Steel. Iron and Steel, 2012, 47(9): 74-78.
Jie Shi, Xinjun Sun, Maoqiu Wang, et al.Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with large-fractioned metastable austenite[J].Scripta Materialia,2010(63): 815–818.
[2]
Jie Shi, Xinjun Sun, Maoqiu Wang, et al.Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with large-fractioned metastable austenite[J].Scripta Materialia,2010(63): 815–818.
[3]
Jie Shi, Wenquan Cao, and Han Dong. Ultrafine grained high strength low alloy steel with high strength and high ductility[J]. Materials Science Forum Vols,2010(654-656 ) : 238-241.
[3]
Jie Shi, Wenquan Cao, and Han Dong. Ultrafine grained high strength low alloy steel with high strength and high ductility[J]. Materials Science Forum Vols,2010(654-656 ) : 238-241.
[4]
Cullity B .D..Elements of X-Ray Diffraction, 2nd Ed.[M].Addision-wdsley Publishing Compan,1978.
[4]
Cullity B .D..Elements of X-Ray Diffraction, 2nd Ed.[M].Addision-wdsley Publishing Compan,1978.
2012, Vol. 47 
