Dynamic microstructure evolution and mechanism of Fe-38Mn alloy during hot shear-compression deformation

被引：16
|
作者：
Sang, Deli [1 ,2 ]
Fu, Ruidong [1 ,3 ]
Wang, Yunpeng [1 ,3 ]
Li, Yijun [1 ,3 ]
机构：
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
[2] Shijiazhuang Tiedao Univ, Coll Mat Sci & Engn, Shijiazhuang 050000, Hebei, Peoples R China
[3] Yanshan Univ, Coll Mat Sci & Engn, Qinhuangdao 066004, Hebei, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2019年 / 747卷
关键词：
Hot deformation; Dynamic microstructure evolution; Dynamic recrystallization; Micro-shear band; Twinning; STAINLESS-STEEL; STRAIN-RATE; RECRYSTALLIZATION BEHAVIOR; GRAIN-BOUNDARIES; TWIN BOUNDARIES; BAND FORMATION; COLD; DISLOCATIONS; COPPER;
D O I：
10.1016/j.msea.2018.12.059
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The dynamic microstructure evolution and mechanism were investigated for Fe-38Mn alloy during hot shear-compression deformation under wide ranges of deformation temperature and strain rate. It was found that increasing the strain rate or the deformation temperature can promote the dynamic recrystallization of Fe-38Mn alloy. In comparison, increased strain rate is more beneficial to obtain fine grains. However, when the deformation temperature reached 1100 degrees C the obvious growth of dynamic recrystallized grains occurred under all strain rates. Benefited from the strain path of the shear-compression deformation and low stacking fault energy of Fe-38Mn alloy, numerous micro-shear bands were introduced into deformed microstructures. The dynamic recrystallization is discontinuous in appearance but continuous in nature, which is actually caused by the micro-shear bands. Furthermore, the mechanism of twinning induced nucleation was confirmed. Particularly, the deformation twinning played a key role on grain refinement and exhibited strong dependence on the strain rate.
引用
收藏
页码：130 / 135
页数：6
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