摘要
利用液态金属冷却定向凝固技术,获得了柱晶TWIP钢试样,并对比研究了传统等轴晶与柱晶TWIP组织特征、基本力学行为及应变率敏感性。结果表明,定向凝固TWIP试样随着抽拉速率的减小枝晶间距增加,晶粒形貌简化。与传统试样相比,定向凝固试样沿着柱状晶纵向的综合力学性能明显提高,其中抽拉速率为120μm/s试样断裂延伸率及强塑积分别提高了30%及22.8%,两者的延伸率及强塑积随着应变率的增加均有所降低,而后者对应变率变化敏感性更低,意味着材料在遭受高速碰撞或冲击时,定向凝固试样仍能保持较高的能量吸收特性。
The mechanical behavior,microstructure characteristics and strain rate effect of TWIP steels prepared by directional solidification were investigated and compared with common TWIP steel with equiaxed grains.The directionally solidified samples(DS samples)showed a typical columnar grain microstructure,and the dendrite spacing increased but the morphology became simple when decreasing the withdrawal rate.The DS samples exhibited higher mechanical properties along the axis,in comparison with common TWIP steel sample.Especially,the elongation and product of strength and elongation of DS120 was increased by 30%and 22.8%,compared to the common TWIP steel.The elongation and product of strength and elongation decreased with the increased strain rate,however,the former was much less insensitive to strain rate relative to the later,meaning that the former could keep a high energy absorption capability in high-velocity impacts.
作者
汪聃
王新福
WANG Dan;WANG Xinfu(School of Physics and Electronic Information, Yan' an University, Yan' an 716000, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第1期1131-1135,1154,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51701206)
安徽省自然科学基金资助项目(1808085QE166)
陕西省自然科学基金资助项目(2019JQ-833)
陕西省教育厅专项科研计划资助项目(19JQ0974)
延安大学博士科研启动资助项目(YDBD2018-21)
关键词
孪生诱发塑性钢
定向凝固
力学性能
能量吸收
twinning induced plasticity steel
directional solidification
mechanical property
energy absorption capability
