中文摘要：

以便改进导致双胞胎的粘性钢的机械性质，谷物形态学被技术与处理线路的变丑和热处理相结合的不同团结定制。三典型谷物形态学，即， equiaxed，象 equiaxed/columnar 谷物一样圆柱被形成，并且他们的机械行为比较地被学习。在三材料之中， equiaxed 谷物材料展出了最高的力量但是最低粘性。取决于谷物尺寸，越小谷物尺寸，越 higher 力量，但是更低延伸。圆柱的谷物材料拥有了最优秀的粘性但是最弱的力量。介绍的这些性质一非单调 ? 树突间距上的依赖，和中等间距导致了力量和粘性的最佳联合。equiaxed/columnar 谷物共存了材料显示出有趣的性质，即，力量和粘性只在单个塑造谷物的材料的那些之间。特别地在一致变丑的也介绍的不同紧张变硬行为上演的三材料。equiaxed 谷物材料显示出变硬的经常的紧张评价，当圆柱的谷物和 equiaxed/columnar 谷物材料与增加真紧张显示出日益增多地增加的率时。

英文摘要：

In order to improve the mechanical properties of twinning-induced plasticity steel, the grain morphology was tailored by different solidification technologies combined with deformation and heat treatment processing routes. Three typical grain morphologies, i.e., equiaxed, columnar as well as equiaxed/columnar grains were formed, and their mechan- ical behaviors were comparatively studied. Among the three materials, the equiaxed grain material exhibited the highest strength but the lowest plasticity. Depending on the grain size, the smaller the grain size, the higher the strength, but the lower the elongation. The columnar grain material pos- sessed the most excellent plasticity but the weakest strength. These properties presented a non-monotonic dependence on the dendrite spacing, and the moderate spacing resulted in the optimum combination of strength and plasticity. The equiaxed/columnar grain coexisted material showed inter- esting properties, i.e., the strength and plasticity were just between those of single grain-shaped materials. The three materials also presented different strain hardening behaviors particularly in the uniform deformation stage. The equiaxed grain material showed a constant strain hardening rate, while the columnar grain and equiaxed/columnar grain materials showed a progressively increasing rate with increasing the true strain.