FANG Xiu-hui
,
YANG Ping
,
LU Fa-yun
,
MENG Li
钢铁研究学报(英文版)
Mechanical properties, microstructure and texture evolution were studied in two tensile-deformed high manganese TWIP steels at different temperatures. Special attention was paid to the effects of deformation temperature and grain orientation on twinning behavior. The results showed that, at -70 ℃ and at room temperature, both twins and hexagonal martensite were found in a lower manganese steel of 26Mn. With deformation temperature rising, twins became less and they disappeared at 500 ℃. Strong <111> texture appeared at 300 ℃, while it weakened at 500 ℃ due to the low strain rate and higher stacking fault energy. EBSD measurement revealed the dependence of deformation twinning on grain orientation at all test temperatures.
关键词:
high manganese steel
,
warm deformation
,
TWIP effect
,
texture
DING Hao
,
DING Hua
,
QIU Chunlin
,
TANG Zhengyou
,
ZENG Jianmin
,
YANG Ping
钢铁研究学报(英文版)
The mechanical property and forming limit experiments were carried out on a high manganese TRIP/TWIP steels with 18.8% manganese. And the forming limit diagram was obtained. This high manganese steel shows outstanding mechanical properties combining high strength and good formability. Its FLD0 is about 38%. The effects of conventional mechanical property on the FLD0 were analyzed. With the contents of Mn increasing, FLD0 increases, which indicates TWIP effect is advantageous to enhance formability. Combining with three classical models and volume invariable principle, a FLD model was established, which fits high manganese steels very well.
关键词:
high manganese TRIP/TWIP steel;mechanical properties;formability;forming limit diagram
